Showing papers by "B. G. Fulsom published in 2022"
16 May 2022
TL;DR: In this article , the first observation of the Ωc0→Ω−μ+νμ decay was presented and measurements of the branching fraction ratios of the π−π+νℓ decays compared to the reference mode π=e or μ.
Abstract: We present the first observation of the Ωc0→Ω−μ+νμ decay and present measurements of the branching fraction ratios of the Ωc0→Ω−ℓ+νℓ decays compared to the reference mode Ωc0→Ω−π+, (ℓ=e or μ). This analysis is based on 89.5 fb−1, 711 fb−1, and 121.1 fb−1 data samples collected with the Belle detector at the KEKB asymmetric-energy e+e− collider at the center-of-mass energies of 10.52 GeV, 10.58 GeV, and 10.86 GeV, respectively. The Ωc0 signal yields are extracted by fitting MΩℓ and MΩπ spectra. The branching fraction ratios B(Ωc0→Ω−e+νe)/B(Ωc0→Ω−π+) and B(Ωc0→Ω−μ+νμ)/B(Ωc0→Ω−π+) are measured to be 1.98±0.13(stat)±0.08(syst) and 1.94±0.18(stat)±0.10(syst), respectively. The ratio of B(Ωc0→Ω−e+νe)/B(Ωc0→Ω−μ+νμ) is measured to be 1.02±0.10(stat)±0.02(syst), which is consistent with the expectation of lepton flavor universality.Received 20 December 2021Accepted 26 April 2022Corrected 23 May 2022DOI:https://doi.org/10.1103/PhysRevD.105.L091101Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.Published by the American Physical SocietyPhysics Subject Headings (PhySH)Research AreasBranching fractionLeptonic, semileptonic & radiative decaysPhysical SystemsCharmed baryonsTechniquesLepton collidersParticles & Fields
7 citations
25 May 2022
TL;DR: In this paper , the left-right asymmetry measurements of e + e − transitions to pairs of muons, taus, and b-quarks were performed with precision sin 2 independent left right asymmetric measurements.
Abstract: precision sin 2 independent left-right asymmetry measurements of e + e − transitions to pairs of muons, taus, and b-quarks.
6 citations
TL;DR: In this paper , a search for axion-like particles (ALPs) in the BABAR experiment at SLAC was performed, and 90% confidence level upper limits on the ALP coupling to electroweak bosons were derived as a function of ALP mass.
Abstract: Axionlike particles (ALPs) are predicted in many extensions of the standard model, and their masses can naturally be well below the electroweak scale. In the presence of couplings to electroweak bosons, these particles could be emitted in flavor-changing B meson decays. We report herein a search for an ALP, a, in the reaction B^{±}→K^{±}a, a→γγ using data collected by the BABAR experiment at SLAC. No significant signal is observed, and 90% confidence level upper limits on the ALP coupling to electroweak bosons are derived as a function of ALP mass, improving current constraints by several orders of magnitude in the range 0.175 GeV
5 citations
TL;DR: In this article , a new structure was found in the KEKB asymmetric-energy e^{+}e^{-} collider with a significance of 4.2σ including systematic uncertainty.
Abstract: We present the study of B[over ¯]^{0}→Σ_{c}(2455)^{0,++}π^{±}p[over ¯] decays based on 772×10^{6} BB[over ¯] events collected with the Belle detector at the KEKB asymmetric-energy e^{+}e^{-} collider. The Σ_{c}(2455)^{0,++} candidates are reconstructed via their decay to Λ_{c}^{+}π^{∓} and Λ_{c}^{+} decays to pK^{-}π^{+}, pK_{S}^{0}, and Λπ^{+} final states. The corresponding branching fractions are measured to be B(B[over ¯]^{0}→Σ_{c}(2455)^{0}π^{+}p[over ¯])=(1.09±0.06±0.07)×10^{-4} and B(B[over ¯]^{0}→Σ_{c}(2455)^{++}π^{-}p[over ¯])=(1.84±0.11±0.12)×10^{-4}, which are consistent with the world average values with improved precision. A new structure is found in the M_{Σ_{c}(2455)^{0,++}π^{±}} spectrum with a significance of 4.2σ including systematic uncertainty. The structure is possibly an excited Λ_{c}^{+} and is tentatively named Λ_{c}(2910)^{+}. Its mass and width are measured to be (2913.8±5.6±3.8) MeV/c^{2} and (51.8±20.0±18.8) MeV, respectively. The products of branching fractions for the Λ_{c}(2910)^{+} are measured to be B(B[over ¯]^{0}→Λ_{c}(2910)^{+}p[over ¯])×B(Λ_{c}(2910)^{+}→Σ_{c}(2455)^{0}π^{+})=(9.5±3.6±1.6)×10^{-6} and B(B[over ¯]^{0}→Λ_{c}(2910)^{+}p[over ¯])×B(Λ_{c}(2910)^{+}→Σ_{c}(2455)^{++}π^{-})=(1.24±0.35±0.10)×10^{-5}. Here, the first and second uncertainties are statistical and systematic, respectively.
4 citations
TL;DR: In this article , a search for the decays of B 0 mesons into a final state containing a Λ baryon and missing energy was conducted, and 90% confidence level upper limits on the branching fractions in the range 2 . 1 − 3 . 8 × 10 − 5 .
Abstract: We present a search for the decays of B 0 mesons into a final state containing a Λ baryon and missing energy. These results are obtained from a 711 fb − 1 data sample that contains 772 × 10 6 B ¯ B pairs and was collected near the ϒ ð 4 S Þ resonance with the Belle detector at the KEKB asymmetric-energy e þ e − collider. We use events in which one B meson is fully reconstructed in a hadronic decay mode and require the remainder of the event to consist of only a single Λ . No evidence for these decays is found, and we set 90% confidence level upper limits on the branching fractions in the range 2 . 1 – 3 . 8 × 10 − 5 . This measurement provides the world ’ s most restrictive limits, with implications for baryogenesis and dark matter production.
3 citations
TL;DR: In this paper , the two-photon process γγ→γψ(2S) was studied from the threshold to 4.2 GeV for the first time.
Abstract: Using 980 fb−1 of data at and around the ϒ(nS) (n=1, 2, 3, 4, 5) resonances collected with the Belle detector at the KEKB asymmetric-energy e+e− collider, the two-photon process γγ→γψ(2S) is studied from the threshold to 4.2 GeV for the first time. Two structures are seen in the invariant mass distribution of γψ(2S): one at MR1=3922.4±6.5±2.0 MeV/c2 with a width of ΓR1=22±17±4 MeV, and another at MR2=4014.3±4.0±1.5 MeV/c2 with a width of ΓR2=4±11±6 MeV; the signals are parametrized with the incoherent sum of two Breit-Wigner functions. The first structure is consistent with the X(3915) or the χc2(3930), and the local statistical significance is determined to be 3.1σ with the systematic uncertainties included. The second matches none of the known charmonium or charmoniumlike states, and its global significance is determined to be 2.8σ including the look-elsewhere effect. The production rates are ΓγγB(R1→γψ(2S))=9.8±3.6±1.3 eV assuming (JPC,|λ|)=(0++,0) or 2.0±0.7±0.2 eV with (2++,2) for the first structure and ΓγγB(R2→γψ(2S))=6.2±2.2±0.8 eV with (0++,0) or 1.2±0.4±0.2 eV with (2++,2) for the second. Here, the first errors are statistical and the second systematic, and λ is the helicity.Received 6 January 2022Accepted 15 June 2022DOI:https://doi.org/10.1103/PhysRevD.105.112011© 2022 American Physical SocietyPhysics Subject Headings (PhySH)Research AreasParticle interactionsParticles & Fields
3 citations
TL;DR: In this article , the authors obtained exclusion limits at 90% Bayesian credibility in the range of 1.7-5.0 −1.0 -1.34 −1 on the cross section of the beamline.
Abstract: The dark photon A^{'} and the dark Higgs boson h^{'} are hypothetical particles predicted in many dark sector models. We search for the simultaneous production of A^{'} and h^{'} in the dark Higgsstrahlung process e^{+}e^{-}→A^{'}h^{'} with A^{'}→μ^{+}μ^{-} and h^{'} invisible in electron-positron collisions at a center-of-mass energy of 10.58 GeV in data collected by the Belle II experiment in 2019. With an integrated luminosity of 8.34 fb^{-1}, we observe no evidence for signal. We obtain exclusion limits at 90% Bayesian credibility in the range of 1.7-5.0 fb on the cross section and in the range of 1.7×10^{-8}-200×10^{-8} on the effective coupling ϵ^{2}×α_{D} for the A^{'} mass in the range of 4.0 GeV/c^{2}
3 citations
Peer Review•
29 Jul 2022
TL;DR: Hadron spectroscopy, the driving force of high-energy physics in its early decades, has experienced a renaissance in interest over the past 20 years due to the discovery of scores of new, potentially “exotic” states (tetraquarks, pentaquarks, hybrid mesons, glueballs), as well as the observation of many new “conventional” hadrons as discussed by the authors .
Abstract: Hadron spectroscopy, the driving force of high-energy physics in its early decades, has experienced a renaissance in interest over the past 20 years due to the discovery of scores of new, potentially “exotic” states (tetraquarks, pentaquarks, hybrid mesons, glueballs), as well as the observation of many new “conventional” hadrons. The new discoveries expose our lack of understanding about hadronic states, beyond just a few low excitations of the simplest quark configurations. Even so, no single theoretical interpretation (such as hadron molecules, threshold effects, diquark compounds, or others) as yet successfully accommodates all of the new multiquark particles, while a great deal of work remains to extract signals of hybrids and glueballs from reaction-amplitude data. This document summarizes the current state of the field from both experimental and theoretical perspectives. On the experimental side, this report summarizes the current, planned, and proposed activities of LHCb and other LHC experiments, Belle II, BESIII, and GlueX, as well as the approved Electron-Ion Collider, the proposed Super Tau-Charm factory, and other future experiments. The theoretical portion provides a brief overview of multiple phenomenological approaches studied to date, progress in rigorous studies of reaction amplitudes, and advances in lattice-QCD simulations.
3 citations
TL;DR: In this paper , the authors present a list of the top 10 most important players in the sport of tennis: A. Asner, 3 H. Atmacan, 8 V. Babu, 9 P. Hsu, 12 Y. Li,13 L. Li Gioi,15 T. Bessner,20 V. Bhardwaj,26 B. Bhuyan,27 T. Bilka,5 A. B.
Abstract: T. Pang,74 V. Savinov,74 I. Adachi,21, 17 H. Aihara,90 D. M. Asner,3 H. Atmacan,8 V. Aulchenko,4, 70 T. Aushev,23 R. Ayad,84 V. Babu,9 P. Behera,29 K. Belous,33 M. Bessner,20 V. Bhardwaj,26 B. Bhuyan,27 T. Bilka,5 A. Bobrov,4, 70 D. Bodrov,23, 48 G. Bonvicini,94 J. Borah,27 A. Bozek,66 M. Bračko,54, 39 P. Branchini,35 T. E. Browder,20 A. Budano,35 M. Campajola,34, 62 D. Červenkov,5 P. Chang,65 A. Chen,64 B. G. Cheon,19 K. Chilikin,48 H. E. Cho,19 K. Cho,43 S.-J. Cho,96 S.-K. Choi,7 Y. Choi,82 S. Choudhury,37 D. Cinabro,94 S. Cunliffe,9 S. Das,53 G. De Pietro,35 R. Dhamija,28 F. Di Capua,34, 62 J. Dingfelder,2 Z. Doležal,5 T. V. Dong,11 D. Dossett,56 S. Dubey,20 D. Epifanov,4, 70 T. Ferber,9 A. Frey,16 B. G. Fulsom,72 R. Garg,73 V. Gaur,93 N. Gabyshev,4, 70 A. Giri,28 P. Goldenzweig,40 E. Graziani,35 T. Gu,74 K. Gudkova,4, 70 C. Hadjivasiliou,72 S. Halder,85 K. Hayasaka,68 H. Hayashii,63 M. T. Hedges,20 C.-L. Hsu,83 T. Iijima,61, 60 K. Inami,60 G. Inguglia,32 A. Ishikawa,21, 17 R. Itoh,21, 17 M. Iwasaki,71 Y. Iwasaki,21 W. W. Jacobs,30 E.-J. Jang,18 S. Jia,13 Y. Jin,90 K. K. Joo,6 J. Kahn,40 D. Kalita,27 A. B. Kaliyar,85 K. H. Kang,41 G. Karyan,9 T. Kawasaki,42 C. Kiesling,55 C. H. Kim,19 D. Y. Kim,81 K.-H. Kim,96 Y.-K. Kim,96 K. Kinoshita,8 P. Kodyš,5 T. Konno,42 A. Korobov,4, 70 S. Korpar,54, 39 E. Kovalenko,4, 70 P. Križan,50, 39 R. Kroeger,57 P. Krokovny,4, 70 T. Kuhr,51 R. Kumar,75 K. Kumara,94 A. Kuzmin,4, 70, 48 Y.-J. Kwon,96 Y.-T. Lai,41 T. Lam,93 J. S. Lange,14 S. C. Lee,46 C. H. Li,49 J. Li,46 L. K. Li,8 Y. Li,13 L. Li Gioi,55 J. Libby,29 K. Lieret,51 D. Liventsev,94, 21 A. Martini,97 M. Masuda,89, 76 T. Matsuda,58 D. Matvienko,4, 70, 48 F. Meier,10 M. Merola,34, 62 F. Metzner,40 K. Miyabayashi,63 R. Mizuk,48, 23 G. B. Mohanty,85 R. Mussa,36 M. Nakao,21, 17 Z. Natkaniec,66 A. Natochii,20 L. Nayak,28 M. Niiyama,45 N. K. Nisar,3 S. Nishida,21, 17 K. Ogawa,68 S. Ogawa,87 H. Ono,67, 68 P. Oskin,48 P. Pakhlov,48, 59 G. Pakhlova,23, 48 S. Pardi,34 H. Park,46 S.-H. Park,21 A. Passeri,35 S. Patra,26 S. Paul,86, 55 T. K. Pedlar,52 R. Pestotnik,39 L. E. Piilonen,93 T. Podobnik,50, 39 V. Popov,23 E. Prencipe,24 M. T. Prim,2 A. Rostomyan,9 N. Rout,29 G. Russo,62 D. Sahoo,37 S. Sandilya,28 A. Sangal,8 L. Santelj,50, 39 T. Sanuki,88 G. Schnell,1, 25 Y. Seino,68 K. Senyo,95 M. E. Sevior,56 M. Shapkin,33 C. Sharma,53 C. P. Shen,13 J.-G. Shiu,65 F. Simon,55 J. B. Singh,73, ∗ A. Sokolov,33 E. Solovieva,48 S. Stanič,69 M. Starič,39 J. F. Strube,72 M. Sumihama,15, 76 T. Sumiyoshi,92 M. Takizawa,79, 22, 77 U. Tamponi,36 K. Tanida,38 N. Taniguchi,21 F. Tenchini,9 K. Trabelsi,47 M. Uchida,91 K. Uno,68 S. Uno,21, 17 P. Urquijo,56 R. Van Tonder,2 G. Varner,20 A. Vinokurova,4, 70 E. Waheed,21 E. Wang,74 M.-Z. Wang,65 X. L. Wang,13 M. Watanabe,68 S. Watanuki,96 E. Won,44 X. Xu,80 B. D. Yabsley,83 W. Yan,78 H. Ye,9 J. Yelton,12 J. H. Yin,44 C. Z. Yuan,31 Y. Zhai,37 Z. P. Zhang,78 V. Zhilich,4, 70 and V. Zhukova48
2 citations
TL;DR: In this article , the atomic yield of a 235U target for incident neutron energies ranging from 0.11 MeV through 92.4 MeV was calculated by an approach that combines a 2E analysis with a stopping force analysis method.
2 citations
08 Jul 2022
TL;DR: In this paper , the authors search for a new gauge boson Z′ that couples only to heavy leptons and their corresponding neutrinos in the process e+e−→Z′(→μ+μ−)μ +μ−, using a 643 fb−1 data sample collected by the Belle experiment at or near the ϒ(1S,2S,3S,4S,5S) resonances at the KEKB collider.
Abstract: We search for a new gauge boson Z′ that couples only to heavy leptons and their corresponding neutrinos in the process e+e−→Z′(→μ+μ−)μ+μ−, using a 643 fb−1 data sample collected by the Belle experiment at or near the ϒ(1S,2S,3S,4S,5S) resonances at the KEKB collider. While previous searches for Z′ performed a data-based estimation of the initial state radiation effect, our search for the Z′ is the first to include effects due to initial state radiation in the signal simulated samples that were used in estimating the detection efficiency. No signal is observed in the Z′ mass range of 0.212–10 GeV/c2, and we set an upper limit on the coupling strength, g′, constraining the possible Z′ contribution to the anomalous magnetic dipole moment of the muon.Received 20 September 2021Accepted 28 June 2022DOI:https://doi.org/10.1103/PhysRevD.106.012003Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.Published by the American Physical SocietyPhysics Subject Headings (PhySH)Research AreasExtensions of gauge sectorLeptonic, semileptonic & radiative decaysParticles & Fields
TL;DR: In this paper , two-particle angular correlation functions are measured in the full relative azimuthal angle (Δϕ) and three units of pseudorapidity, defined by either the electron beam axis or the event-shape thrust axis, and are studied as a function of charged particle multiplicity.
Abstract: The measurement of two-particle angular correlation functions in high-multiplicity e^{+}e^{-} collisions at sqrt[s]=10.52 GeV is reported. In this study, the 89.5 fb^{-1} of hadronic e^{+}e^{-} annihilation data collected by the Belle detector at KEKB are used. Two-particle angular correlation functions are measured in the full relative azimuthal angle (Δϕ) and three units of pseudorapidity (Δη), defined by either the electron beam axis or the event-shape thrust axis, and are studied as a function of charged-particle multiplicity. The measurement in the thrust axis analysis, with mostly outgoing quark pairs determining the reference axis, is sensitive to the region of additional soft gluon emissions. No significant anisotropic collective behavior is observed with either coordinate analyses. Near-side jet correlations appear to be absent in the thrust axis analysis. The measurements are compared to predictions from various event generators and are expected to provide new constraints to the phenomenological models in the low-energy regime.
04 Mar 2022
TL;DR: In this article , a search for the decays of B0 mesons into a final state containing a Λ baryon and missing energy was conducted, but no evidence for these decays is found, and the 90% confidence level upper limits on the branching fractions in the range 2.1−3.8×10−5.
Abstract: We present a search for the decays of B0 mesons into a final state containing a Λ baryon and missing energy. These results are obtained from a 711 fb−1 data sample that contains 772×106 BB¯ pairs and was collected near the ϒ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e− collider. We use events in which one B meson is fully reconstructed in a hadronic decay mode and require the remainder of the event to consist of only a single Λ. No evidence for these decays is found, and we set 90% confidence level upper limits on the branching fractions in the range 2.1–3.8×10−5. This measurement provides the world’s most restrictive limits, with implications for baryogenesis and dark matter production.Received 29 October 2021Accepted 17 February 2022DOI:https://doi.org/10.1103/PhysRevD.105.L051101Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.Published by the American Physical SocietyPhysics Subject Headings (PhySH)Research AreasBaryogenesis & leptogenesisHypothetical particle physics modelsParticle dark matterParticles & Fields
TL;DR: In this paper , the authors obtained 95% confidence level upper bound on the branching fraction ratio B(τ-}→e^{-}α) in the range (1.1-9.7)×10^{-3) for α masses between 0 and 1.
Abstract: We search for lepton-flavor-violating τ^{-}→e^{-}α and τ^{-}→μ^{-}α decays, where α is an invisible spin-0 boson. The search uses electron-positron collisions at 10.58 GeV center-of-mass energy with an integrated luminosity of 62.8 fb^{-1}, produced by the SuperKEKB collider and collected with the Belle II detector. We search for an excess in the lepton-energy spectrum of the known τ^{-}→e^{-}ν[over ¯]_{e}ν_{τ} and τ^{-}→μ^{-}ν[over ¯]_{μ}ν_{τ} decays. We report 95% confidence-level upper limits on the branching-fraction ratio B(τ^{-}→e^{-}α)/B(τ^{-}→e^{-}ν[over ¯]_{e}ν_{τ}) in the range (1.1-9.7)×10^{-3} and on B(τ^{-}→μ^{-}α)/B(τ^{-}→μ^{-}ν[over ¯]_{μ}ν_{τ}) in the range (0.7-12.2)×10^{-3} for α masses between 0 and 1.6 GeV/c^{2}. These results provide the most stringent bounds on invisible boson production from τ decays.
TL;DR: In this article , the branching fraction and the direct CP-violating asymmetry of the charmless decay B 0 → K 0 π 0 at Belle II were measured and compared to a sample of e + e − collisions recorded at the Υ (4 S ) resonance.
Abstract: We report measurements of the branching fraction ( B ) and direct CP -violating asymmetry 93 ( A CP ) of the charmless decay B 0 → K 0 π 0 at Belle II. A sample of e + e − collisions, corresponding 94 to 189 . 8 fb − 1 of integrated luminosity, recorded at the Υ (4 S ) resonance is used for the first decay- 95 time-dependent analysis of these decays within the experiment. We reconstruct about 135 signal 96 candidates, and measure B ( B 0 → K 0 π 0 ) = [11 . 0 ± 1 . 2(stat) ± 1 . 0(syst)] × 10 − 6 and A CP ( B 0 → 97 K 0 π 0 ) = − 0 . 41 +0 . 30 − 0 . 32 (stat) ± 0 . 09(syst). 98
22 Jul 2022
TL;DR: In this paper , a study of B → J/ψ ( (cid:96) + σ(cid :96) − ) K decays at the SuperKEKB asymmetric-energy collider during 2019-2021, corresponding to an integrated luminosity of 189 fb − 1 .
Abstract: We report a study of B → J/ψ ( (cid:96) + (cid:96) − ) K decays, where (cid:96) represents an electron or a muon, using e + e − collisions at the Υ(4 S ) resonance. The data were collected by the Belle II experiment at the SuperKEKB asymmetric-energy collider during 2019–2021, corresponding to an integrated luminosity of 189 fb − 1 . The measured quantities are the branching fractions ( B ) of the decay channels B + → J/ψ ( e + e − ) K + , B + → J/ψ ( µ + µ − ) K + , B 0 → J/ψ ( e + e − ) K 0 S , and B 0 → J/ψ ( µ + µ − ) K 0 S ; the lepton-flavor-dependent isospin asymmetries for the electron [ A I ( B → J/ψ ( e + e − ) K )] and muon [ A I ( B → J/ψ ( µ + µ − ) K )] channels; and the ratios of branching fractions between the muon and electron channels for the
11 Jan 2022
TL;DR: The first direct measurement of the inclusive branching fraction via Bs tagging in e+e−→ϒ(5S) events was reported in this paper , where the authors obtained B(Bs→DsX)=(60.2±5.8±2.3)%, where the first uncertainty is statistical and the second is systematic.
Abstract: We report the first direct measurement of the inclusive branching fraction B(Bs→DsX) via Bs tagging in e+e−→ϒ(5S) events. Tagging is accomplished through a partial reconstruction of semileptonic decays Bs→DsXℓν, where X denotes unreconstructed additional hadrons or photons and ℓ is an electron or muon. With 121.4 fb−1 of data collected at the ϒ(5S) resonance by the Belle detector at the KEKB asymmetric-energy e+e− collider, we obtain B(Bs→DsX)=(60.2±5.8±2.3)%, where the first uncertainty is statistical and the second is systematic.Received 21 June 2021Revised 3 December 2021Accepted 17 December 2021DOI:https://doi.org/10.1103/PhysRevD.105.012004Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.Published by the American Physical SocietyPhysics Subject Headings (PhySH)Research AreasParticle decaysParticle interactionsParticles & Fields
17 Aug 2022
TL;DR: The branching fractions of the decays B+→ηℓ+ν↓ and B+ →η−η+ν+ν−1 were measured using a data sample of 711 fb−1 containing 772×106BB¯ pairs as discussed by the authors .
Abstract: The branching fractions of the decays B+→ηℓ+νℓ and B+→η′ℓ+νℓ are measured, where ℓ is either an electron or a muon, using a data sample of 711 fb−1 containing 772×106BB¯ pairs collected at the ϒ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e− collider. To reduce the dependence of the result on the form factor model, the measurement is performed over the entire q2 range. The resulting branching fractions are B(B+→ηℓ+νℓ)=(2.83±0.55(stat.)±0.34(syst.))×10−5 and B(B+→η′ℓ+νℓ)=(2.79±1.29(stat.)±0.30(syst.))×10−5.Received 28 April 2021Accepted 4 August 2022DOI:https://doi.org/10.1103/PhysRevD.106.032013Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.Published by the American Physical SocietyPhysics Subject Headings (PhySH)Research AreasBranching fractionLeptonic, semileptonic & radiative decaysPhysical SystemsBottom quarkTechniquesLepton collidersParticles & Fields
19 Mar 2022
TL;DR: In this paper , the authors present a survey of the authors of this paper: A.M. Asner1, H. Atmacan2, Swarachandran et al.
Abstract: D.M. Asner1, H. Atmacan2, Sw. Banerjee3, J.V. Bennett4, M. Bertemes1, M. Bessner5, D. Biswas3, G. Bonvicini6, N. Brenny7, R.A. Briere8, T.E. Browder5, C. Chen7, S. Choudhury7, D. Cinabro6, J. Cochran7, L.M. Cremaldi4, A. Di Canto1, S. Dubey5, K. Flood5, B. G. Fulsom9, V. Gaur10, R. Godang11, T. Gu12, Y, Guan2, J. Guilliams4, C. Hadjivasiliou9, O. Hartbrich5, W.W. Jacobs13, D.E. Jaffe1, S. Kang7, L. Kapitánová12, C. Ketter5, A. Khatri7, K. Kinoshita2 , S. Kohani5, H. Korandla5, I. Koseoglu Sari5, R. Kroeger4, J. Kumar8, K.J. Kumara4, T. Lam10, P.J. Laycock1, L. Li2, D. Liventsev6, F. Meier14, S. Mitra7, A. Natochii5, N. Nellikunnummel1, K.A. Nishimura5, E.R. Oxford8, A. Panta4, K. Parham14, T.K. Pedlar15, R. Peschke5, L.E. Piilonen10, S. Pokharel4, S. Prell7, H. Purwar5, D.E. Ricalde Herrmann6, C. Rosenfeld16, D. Sahoo7, D.A. Sanders4, A. Sangal2, V. Savinov12, S. Schneider14, J. Schueler5, A.J. Schwartz2, V. Shebalin5, A. Sibidanov5, Z.S. Stottler10, J. Strube9, S. Tripathi5, S.E. Vahsen5, G.S. Varner5, A. Vossen14, D. Wang17, E. Wang12, L. Wood9, J. Yelton17, Y. Zhai7, and B. Zhang5
TL;DR: In this paper , a search for axion-like particles (ALPs) in the reaction B±→K±a, a→γγ using data collected by the BABAR experiment at SLAC is reported.
Abstract: Axionlike particles (ALPs) are predicted in many extensions of the standard model, and their masses can naturally be well below the electroweak scale. In the presence of couplings to electroweak bosons, these particles could be emitted in flavor-changing B meson decays. We report herein a search for an ALP, a, in the reaction B±→K±a, a→γγ using data collected by the BABAR experiment at SLAC. No significant signal is observed, and 90% confidence level upper limits on the ALP coupling to electroweak bosons are derived as a function of ALP mass, improving current constraints by several orders of magnitude in the range 0.175 GeV
TL;DR: The first search for electron-muon lepton flavor violation (LFV) in the decay of a b quark and b antiquark bound state was reported in this article .
Abstract: We report on the first search for electron-muon lepton flavor violation (LFV) in the decay of a b quark and b antiquark bound state. We look for the LFV decay ϒ(3S)→e^{±}μ^{∓} in a sample of 118 million ϒ(3S) mesons from 27 fb^{-1} of data collected with the BABAR detector at the SLAC PEP-II e^{+}e^{-} collider operating with a 10.36 GeV center-of-mass energy. No evidence for a signal is found, and we set a limit on the branching fraction B[ϒ(3S)→e^{±}μ^{∓}]<3.6×10^{-7} at 90% C. L. This result can be interpreted as a limit Λ_{NP}/g_{NP}^{2}>80 TeV on the energy scale Λ_{NP} divided by the coupling-squared g_{NP}^{2} of relevant new physics (NP).
TL;DR: In this paper , the authors present a survey of the state-of-the-art work in the field of artificial intelligence, focusing on the role of the human brain in decision-making process.
Abstract: T. Czank, I. Jaegle, 85 A. Ishikawa, 15 I. Adachi, 15 K. Adamczyk, H. Aihara, D. M. Asner, T. Aushev, R. Ayad, V. Babu, S. Bahinipati, P. Behera, J. Bennett, F. Bernlochner, M. Bessner, V. Bhardwaj, B. Bhuyan, T. Bilka, J. Biswal, A. Bobrov, 67 G. Bonvicini, A. Bozek, M. Bračko, T. E. Browder, M. Campajola, 58 L. Cao, D. Červenkov, M.-C. Chang, A. Chen, B. G. Cheon, K. Chilikin, H. E. Cho, K. Cho, Y. Choi, S. Choudhury, D. Cinabro, S. Das, N. Dash, G. De Nardo, 58 R. Dhamija, F. Di Capua, 58 Z. Doležal, T. V. Dong, S. Eidelman, 67, 45 T. Ferber, D. Ferlewicz, B. G. Fulsom, R. Garg, V. Gaur, A. Garmash, 67 A. Giri, P. Goldenzweig, B. Golob, 36 O. Grzymkowska, Y. Guan, K. Gudkova, 67 C. Hadjivasiliou, O. Hartbrich, K. Hayasaka, H. Hayashii, M. T. Hedges, M. Hernandez Villanueva, T. Higuchi, W.-S. Hou, C.-L. Hsu, T. Iijima, 56 K. Inami, G. Inguglia, R. Itoh, 15 M. Iwasaki, Y. Iwasaki, W. W. Jacobs, E.-J. Jang, S. Jia, Y. Jin, C. W. Joo, K. K. Joo, K. H. Kang, G. Karyan, T. Kawasaki, H. Kichimi, C. Kiesling, B. H. Kim, C. H. Kim, D. Y. Kim, K.-H. Kim, S. H. Kim, Y.-K. Kim, P. Kodyš, I. Komarov, T. Konno, A. Korobov, 67 S. Korpar, E. Kovalenko, 67 P. Križan, 36 R. Kroeger, P. Krokovny, 67 T. Kuhr, M. Kumar, K. Kumara, Y.-J. Kwon, Y.-T. Lai, J. S. Lange, I. S. Lee, S. C. Lee, Y. B. Li, L. Li Gioi, J. Libby, K. Lieret, D. Liventsev, 19 T. Luo, C. MacQueen, M. Masuda, 73 T. Matsuda, D. Matvienko, 67, 45 M. Merola, 58 F. Metzner, K. Miyabayashi, R. Mizuk, 21 G. B. Mohanty, S. Mohanty, 91 T. Mori, M. Mrvar, R. Mussa, M. Nakao, 15 Z. Natkaniec, A. Natochii, L. Nayak, M. Niiyama, N. K. Nisar, S. Nishida, 15 H. Ono, 65 Y. Onuki, P. Pakhlov, 55 G. Pakhlova, 45 T. Pang, S. Pardi, H. Park, S.-H. Park, S. Patra, S. Paul, 51 T. K. Pedlar, R. Pestotnik, L. E. Piilonen, T. Podobnik, 36 V. Popov, E. Prencipe, M. T. Prim, M. Röhrken, A. Rostomyan, N. Rout, G. Russo, D. Sahoo, S. Sandilya, A. Sangal, L. Santelj, 36 T. Sanuki, V. Savinov, G. Schnell, 23 J. Schueler, C. Schwanda, Y. Seino, K. Senyo, M. E. Sevior, M. Shapkin, C. Sharma, V. Shebalin, C. P. Shen, J.-G. Shiu, B. Shwartz, 67 A. Sokolov, E. Solovieva, S. Stanič, M. Starič, Z. S. Stottler, M. Sumihama, T. Sumiyoshi, W. Sutcliffe, M. Takizawa, 20, 74 K. Tanida, Y. Tao, F. Tenchini, K. Trabelsi, M. Uchida, S. Uehara, 15 T. Uglov, 21 K. Uno, S. Uno, 15 P. Urquijo, R. Van Tonder, G. Varner, A. Vossen, C. H. Wang, E. Wang, M.-Z. Wang, P. Wang, S. Watanuki, E. Won, X. Xu, B. D. Yabsley, H. Yamamoto, W. Yan, S. B. Yang, H. Ye, J. Yelton, J. H. Yin, Y. Yusa, Z. P. Zhang, V. Zhilich, 67 V. Zhukova, and V. Zhulanov 67
15 Jun 2022
TL;DR: In this paper , the branching fraction and direct CP-violating asymmetry of the charmless decay B 0 → K 0 π 0 at Belle II were measured and compared to a sample of e + e − collisions recorded at the Υ (4 S ) resonance.
Abstract: We report measurements of the branching fraction ( B ) and direct CP -violating asymmetry ( A CP ) of the charmless decay B 0 → K 0 π 0 at Belle II. A sample of e + e − collisions, corresponding to 189 . 8 fb − 1 of integrated luminosity, recorded at the Υ (4 S ) resonance is used for the first decay-time-dependent analysis of these decays within the experiment. We reconstruct about 135 signal candidates, and measure B ( B 0 → K 0 π 0 ) = [11 . 0 ± 1 . 2(stat) ± 1 . 0(syst)] × 10 − 6 and A CP ( B 0 → K 0 π 0 ) = − 0 . 41 +0 . 30 − 0 . 32 (stat) ± 0 . 09(syst).
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TL;DR: In this article , the authors present a survey of the state-of-the-art work in the field of machine learning with respect to the application of machine translation in the context of artificial intelligence.
Abstract: K.-N. Chu , Y.-R. Lin , M.-Z. Wang , I. Adachi , K. Adamczyk , H. Aihara , S. Al Said , D. M. Asner , H. Atmacan , V. Aulchenko , T. Aushev , R. Ayad , V. Babu , Sw. Banerjee , P. Behera , K. Belous , J. Bennett , M. Bessner , V. Bhardwaj , B. Bhuyan , T. Bilka , D. Biswas , D. Bodrov , G. Bonvicini , J. Borah , A. Bozek , M. Bračko , P. Branchini , T. E. Browder , A. Budano , M. Campajola , D. Červenkov , M.-C. Chang , P. Chang , A. Chen , B. G. Cheon , K. Chilikin , H. E. Cho , K. Cho , S.-J. Cho , S.-K. Choi , Y. Choi , S. Choudhury , D. Cinabro , G. De Nardo , G. De Pietro , R. Dhamija , F. Di Capua , J. Dingfelder , Z. Doležal , T. V. Dong , D. Epifanov , T. Ferber , D. Ferlewicz , B. G. Fulsom , V. Gaur , A. Garmash , A. Giri , P. Goldenzweig , B. Golob , E. Graziani , T. Gu , K. Gudkova , C. Hadjivasiliou , S. Halder , X. Han , K. Hayasaka , H. Hayashii , W.-S. Hou , C.-L. Hsu , K. Huang , T. Iijima , K. Inami , N. Ipsita , A. Ishikawa , R. Itoh , M. Iwasaki , W. W. Jacobs , E.-J. Jang , Y. Jin , K. K. Joo , D. Kalita , A. B. Kaliyar , T. Kawasaki , C. Kiesling , C. H. Kim , D. Y. Kim , K.-H. Kim , Y.-K. Kim , P. Kodyš , T. Konno , A. Korobov , S. Korpar , E. Kovalenko , P. Križan , P. Krokovny , T. Kuhr , R. Kumar , K. Kumara , A. Kuzmin , Y.-J. Kwon , Y.-T. Lai , T. Lam , J. S. Lange , S. C. Lee , C. H. Li , J. Li , L. K. Li , S. X. Li , Y. Li , Y. B. Li , L. Li Gioi , J. Libby , K. Lieret , D. Liventsev , T. Luo , M. Masuda , T. Matsuda , D. Matvienko , S. K. Maurya , F. Meier , M. Merola , F. Metzner , K. Miyabayashi , R. Mizuk , G. B. Mohanty , I. Nakamura , M. Nakao , Z. Natkaniec , A. Natochii , L. Nayak , N. K. Nisar , S. Nishida , Y. Onuki , P. Oskin , P. Pakhlov , G. Pakhlova , S. Pardi , H. Park , J. Park , A. Passeri , S. Paul , T. K. Pedlar , R. Pestotnik , L. E. Piilonen , T. Podobnik , E. Prencipe , M. T. Prim , A. Rostomyan , N. Rout , G. Russo , S. Sandilya , L. Santelj , V. Savinov , G. Schnell , C. Schwanda , Y. Seino , K. Senyo , M. E. Sevior , W. Shan , M. Shapkin , C. Sharma , C. P. Shen , J.-G. Shiu , B. Shwartz , F. Simon , A. Sokolov , E. Solovieva , M. Starič , Z. S. Stottler , J. F. Strube , M. Sumihama , K. Sumisawa , T. Sumiyoshi , M. Takizawa , U. Tamponi , K. Tanida , F. Tenchini , K. Trabelsi , M. Uchida , T. Uglov , Y. Unno , S. Uno , P. Urquijo , Y. Usov , S. E. Vahsen , R. van Tonder , G. Varner , K. E. Varvell , A. Vinokurova , A. Vossen , S. Watanuki , E. Won , X. Xu , B. D. Yabsley , W. Yan , S. B. Yang , J. Yelton , J. H. Yin , C. Z. Yuan , L. Yuan , Y. Yusa , Z. P. Zhang , V. Zhilich , and V. Zhukova (The Belle Collaboration)
DOI•
08 Dec 2022
TL;DR: In this paper , the authors report the measurement of the mass, width, and the relative branching ratios of the charmed baryon of the KEKB asymmetric-energy collider.
Abstract: Using the entire data sample of $980\,\textrm{fb}^{-1}$ collected with the Belle detector operating at the KEKB asymmetric-energy collider, we report the measurement of the mass, width, and the relative branching ratios of the $\Lambda_c(2625)^+$ charmed baryon. The mass difference between $\Lambda_c(2625)^+$ and $\Lambda_c^+$ is measured to be $M(\Lambda_c(2625)^{+}) - M(\Lambda_c^{+}) = 341.518 \pm 0.006 \pm 0.049\ \mathrm{MeV}/\mathit{c}^2$. The upper limit on the width is measured to be $\Gamma(\Lambda_c(2625)^+)<0.52\,\mathrm{MeV}/\textit{c}^2$ at 90\% credibility level. Based on a full Dalitz plot fit, branching ratios with respect to the mode $\Lambda_c(2625)^+ \to \Lambda_c^+ \pi^+ \pi^-$ are measured to be $\frac{\mathcal{B}(\Lambda_c(2625)^+ \to \Sigma_c^{0} \pi^{+})} {\mathcal{B}(\Lambda_c(2625)^+ \to \Lambda_c^+ \pi^{+} \pi^{-})} = (5.19 \pm 0.23 \pm 0.40) \%$ and $\frac{\mathcal{B}(\Lambda_c(2625)^+ \to \Sigma_c^{++} \pi^{-})} {\mathcal{B}(\Lambda_c(2625)^+ \to \Lambda_c^+ \pi^{+} \pi^{-})} = (5.13 \pm 0.26 \pm 0.32) \%$. These measurements can be used to further constrain the parameters of the underlying theoretical models.
01 Jan 2022
13 Jun 2022
TL;DR: In this article , the authors measured the branching fraction of B → K ∗ (892) (cid:96) +(cid :96) − decays with the Belle II experiment at the SuperKEKB e + e − asymmetric-energy collider.
Abstract: We report a measurement of the branching fraction of B → K ∗ (892) (cid:96) + (cid:96) − decays, where (cid:96) + (cid:96) − = µ + µ − or e + e − , using electron-positron collisions recorded at an energy at or near the Υ (4 S ) mass and corresponding to an integrated luminosity of 189 fb − 1 . The data was collected during 2019–2021 by the Belle II experiment at the SuperKEKB e + e − asymmetric-energy collider. We reconstruct K ∗ (892) candidates in the K + π − , K 0 S π + , and K + π 0 final states. The signal yields with statistical uncertainties are 22 ± 6, 18 ± 6, and 38 ± 9 for the decays B → K ∗ (892) µ + µ − , B → K ∗ (892) e + e − , and B → K ∗ (892) (cid:96) + (cid:96) − , respectively. We measure the branching fractions of these decays for the entire range of the dilepton mass, excluding the very low mass region to suppress the B → K ∗ (892) γ ( → e + e − ) background and regions compatible with decays of charmonium resonances, to be
TL;DR: In this article, the authors measured an inclusive branching fraction of (19.0±1.4)×10−6 and an inclusive CP asymmetry of (9.2±6.8±0.7)%, where the first uncertainties are statistical and the second are systematic.
Abstract: We study B^{+}→π^{+}π^{0}π^{0} using 711 fb^{-1} of data collected at the ϒ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e^{+}e^{-} collider. We measure an inclusive branching fraction of (19.0±1.5±1.4)×10^{-6} and an inclusive CP asymmetry of (9.2±6.8±0.7)%, where the first uncertainties are statistical and the second are systematic, and a B^{+}→ρ(770)^{+}π^{0} branching fraction of (11.2±1.1±0.9_{-1.6}^{+0.8})×10^{-6}, where the third uncertainty is due to possible interference with B^{+}→ρ(1450)^{+}π^{0}. We present the first observation of a structure around 1 GeV/c^{2} in the π^{0}π^{0} mass spectrum, with a significance of 6.4σ, and measure a branching fraction to be (6.9±0.9±0.6)×10^{-6}. We also report a measurement of local CP asymmetry in this structure.