Showing papers by "Prafulla Kumar Behera published in 2002"
Journal Article•
TL;DR: The B meson decay modes B -->Dpp; and B-->D(*)pp; have been studied using 29.4 fb(-1) of data collected with the Belle detector at KEKB using the corresponding upper limits at 90% C.L. are presented.
Abstract: The B meson decay modes B → Dpp and B → D*pp have been studied using 29.4 fb - 1 of data collected with the Belle detector at KEKB. The B 0 → D 0 pp and B 0 → D* 0 pp decays have been observed for the first time with branching fractions B(B 0 → D 0 pp) = (1.18 ′ 0.15 ′ 0.16) X 10 - 4 and B(B 0 → D* 0 pp) = (1.20 + 0 . 3 3 - 0 . 2 9 ′ 0.21) X 10 - 4 . No signal has been found for the B + → D + pp and B + → D* + pp decay modes, and the corresponding upper limits at 90% C.L. are presented.
441 citations
TL;DR: In this paper, the authors report the observation of prompt $J/\ensuremath{\psi}$ via double $c\overline{c}$ production from the ${e}^{+}{e}^{\ENSuremath{-}}$ continuum.
Abstract: We report the observation of prompt $J/\ensuremath{\psi}$ via double $c\overline{c}$ production from the ${e}^{+}{e}^{\ensuremath{-}}$ continuum. In this process one $c\overline{c}$ pair fragments into a $J/\ensuremath{\psi}$ meson while the remaining pair either produces a charmonium state or fragments into open charm. Both cases have been experimentally observed. We find cross sections of $\ensuremath{\sigma}[{e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}J/\ensuremath{\psi}{\ensuremath{\eta}}_{c}(\ensuremath{\gamma})]\ifmmode\times\else\texttimes\fi{}\mathcal{B}({\ensuremath{\eta}}_{c}\ensuremath{\rightarrow}\ensuremath{\ge}4\text{ }\text{ }\mathrm{\text{charged}})=({0.033}_{\ensuremath{-}0.006}^{+0.007}\ifmmode\pm\else\textpm\fi{}0.009)\text{ }\text{ }\mathrm{p}\mathrm{b}$ and $\ensuremath{\sigma}({e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}J/\ensuremath{\psi}{D}^{*+}X)=({0.53}_{\ensuremath{-}0.15}^{+0.19}\ifmmode\pm\else\textpm\fi{}0.14)\text{ }\text{ }\mathrm{p}\mathrm{b}$ and infer $\ensuremath{\sigma}({e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}J/\ensuremath{\psi}c\overline{c})/\ensuremath{\sigma}({e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}J/\ensuremath{\psi}X)={0.59}_{\ensuremath{-}0.13}^{+0.15}\ifmmode\pm\else\textpm\fi{}0.12$. These results are obtained from a $46.2\text{ }\text{ }{\mathrm{f}\mathrm{b}}^{\ensuremath{-}1}$ data sample collected near the $\ensuremath{\Upsilon}(4S)$ resonance, with the Belle detector at the KEKB collider.
200 citations
TL;DR: In this paper, a study of three-body charmless decays B+ => K+h+h-$ based on a 29.1 fb^{-1} data sample collected with the Belle detector is presented.
Abstract: We report on a study of three-body charmless decays B+ => K+h+h-$ based on a 29.1 fb^{-1} data sample collected with the Belle detector. With no assumptions on the intermediate mechanisms, the following three-body branching fractions have been measured for the first time: Br(B+ => K+pi-pi+) = (55.6\pm5.8\pm7.7)x10^{-6} and Br(B+ => K+K-K+) = (35.3\pm3.7\pm4.5)x10^{-6}. We present the first observation of the decay B+ => f_0(980)K+ with a branching fraction product of Br(B+ => f_0(980)K+)xBr(f_0(980) => \pi+\pi-)= (9.6^{+2.5+1.5+3.4}_{-2.3-1.5-0.8})x10^{-6}. This is the first reported example of a B meson decay to a scalar pseudoscalar final state. We also report the first observation of B+ => K*(892)^0 pi+ decay with a branching fraction of Br(B+ => K*(892)^0 pi+) = (19.4^{+4.2+2.1+3.5}_{-3.9-2.1-6.8})x10^{-6}.
139 citations
TL;DR: In this article, an improved measurement of the standard model CP violation parameter was presented based on a sample of $85\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $B\overline{B}$ pairs collected at the ϵ-Upsilon (4S) resonance with the Belle detector at the KEKB asymmetric-energy collider.
Abstract: We present an improved measurement of the standard model CP violation parameter $\mathrm{sin}2{\ensuremath{\varphi}}_{1}$ (also known as $\mathrm{sin}2\ensuremath{\beta})$ based on a sample of $85\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $B\overline{B}$ pairs collected at the $\ensuremath{\Upsilon}(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy ${e}^{+}{e}^{\ensuremath{-}}$ collider. One neutral B meson is reconstructed in a $J/\ensuremath{\psi}{K}_{S}^{0},$ $\ensuremath{\psi}{(2S)K}_{S}^{0},$ ${\ensuremath{\chi}}_{c1}{K}_{S}^{0},$ ${\ensuremath{\eta}}_{c}{K}_{S}^{0},$ $J/\ensuremath{\psi}{K}^{*0},$ or $J/\ensuremath{\psi}{K}_{L}^{0}$ CP-eigenstate decay channel and the flavor of the accompanying B meson is identified from its decay products. From the asymmetry in the distribution of the time interval between the two B meson decay points, we obtain $\mathrm{sin}2{\ensuremath{\varphi}}_{1}=0.719\ifmmode\pm\else\textpm\fi{}0.074(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.035(\mathrm{syst}).$
136 citations
TL;DR: In this article, the authors reported the observation of a narrow peak in the invariant mass distribution in a sample of exclusive $B\ensuremath{\rightarrow}K{K}_{S}{K}^{\ensure-math{-}}{-ensureMath{\pi}}^{+}$ decays collected with the Belle detector at the KEKB asymmetric k-collider.
Abstract: We report the observation of a narrow peak in the ${K}_{S}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}$ invariant mass distribution in a sample of exclusive $B\ensuremath{\rightarrow}K{K}_{S}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}$ decays collected with the Belle detector at the KEKB asymmetric ${e}^{+}{e}^{\ensuremath{-}}$ collider. The measured mass of the peak is $M=3654\ifmmode\pm\else\textpm\fi{}6(\mathrm{s}\mathrm{t}\mathrm{a}\mathrm{t})\ifmmode\pm\else\textpm\fi{}8(\mathrm{s}\mathrm{y}\mathrm{s}\mathrm{t})\text{ }\text{ }\mathrm{M}\mathrm{e}\mathrm{V}/{c}^{2}$, and we place a 90% confidence level upper limit on the width of $\ensuremath{\Gamma}l55\text{ }\text{ }\mathrm{M}\mathrm{e}\mathrm{V}/{c}^{2}$. The properties agree with heavy-quark potential model expectations for the ${\ensuremath{\eta}}_{c}(2S)$ meson, the $n=2$ singlet $S$ charmonium state.
122 citations
21 Sep 2002-Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment
TL;DR: In this article, a cut on the normalized muon likelihood L μ was applied to identify the track as a muon and the average muon detection efficiency was 89% and the pion fake rate per track was 1.4% over the KLM acceptance.
Abstract: This paper describes the muon identification method and its performance in the Belle experiment at KEKB. Muon and hadron likelihood are calculated for each track using its range and transverse scattering in the KL-and-muon detector (KLM). We apply a cut on the normalized muon likelihood L μ to identify the track as a muon. Above the detection threshold of 0.6 GeV /c , the measured muon detection efficiency and pion fake rate are approximately constant for momenta greater than 1.0 and 1.5 GeV /c , respectively. Between 1.0 and 3.0 GeV /c , the averaged muon detection efficiency is 89% and the pion fake rate per track is 1.4% over the KLM acceptance, using the standard selection criterion L μ >0.9 .
115 citations
TL;DR: In this article, the authors reported the first example of a $b\to s$ transition with baryons in the final state, where the mass spectrum in this decay is inconsistent with phase space and is peaked at low mass.
Abstract: We report the observation of the decay mode $B^{\pm}\to p \bar{p} K^{\pm}$ based on an analysis of 29.4 fb$^{-1}$ of data collected by the Belle detector at KEKB. This is the first example of a $b\to s$ transition with baryons in the final state. The $p \bar{p}$ mass spectrum in this decay is inconsistent with phase space and is peaked at low mass. The branching fraction for this decay is measured to be ${\cal B}(B^{\pm}\to p \bar{p} K^{\pm}) =(4.3^{+1.1}_{-0.9}({\rm stat})\pm 0.5({\rm syst}))\times 10^{-6}.$ We also report upper limits for the decays $B^0\to p \bar{p} K_S$ and $B^{\pm}\to p \bar{p} \pi^{\pm}$.
83 citations
TL;DR: In this paper, the CLEO detector at the Cornell Electron Storage Ring has been used to detect the ground state of the Baryon in the decay of the first generation.
Abstract: Using the CLEO detector at the Cornell Electron Storage Ring we have observed the [Formula presented] ([Formula presented] ground state) in the decay [Formula presented]. We find a signal of [Formula presented] events. The probability that we have observed a background fluctuation is [Formula presented]. We measure [Formula presented] and [Formula presented]. This is the first statistically significant observation of an individual decay mode of the [Formula presented] in [Formula presented] annihilation and the first example of a baryon decaying via [Formula presented] emission, where no quarks from the first generation participate in the reaction.
78 citations
Journal Article•
TL;DR: In this paper, the decay mode B γ → ppK γ was observed and the branching fraction for this decay was measured to be B(B γ ) = [4.3 + 1. 1 - 0. 9 (stat) ′ 0.5(syst)] X 10 - 6.
Abstract: We report the observation of the decay mode B γ → ppK γ based on an analysis of 29.4 fb - 1 of data collected by the Belle detector at KEKB. This is the first example of a b → s transition with baryons in the final state.The pp mass spectrum in this decay is inconsistent with phase space and is peaked at low mass. The branching fraction for this decay is measured to be B(B γ → ppK γ ) = [4.3 + 1 . 1 - 0 . 9 (stat) ′ 0.5(syst)] X 10 - 6 . We also report upper limits for the decays B 0 → ppK S and B γ → ppπ γ .
70 citations
TL;DR: In this article, a Belle detector was used to detect the production of mesons in the Belle detector at the $32.4$ data sample at the 4S level and at the 2S level.
Abstract: The production of prompt $J/\ensuremath{\psi}$, $\ensuremath{\psi}(2S)$, ${\ensuremath{\chi}}_{c1}$, and ${\ensuremath{\chi}}_{c2}$ is studied using a $32.4{\mathrm{fb}}^{\ensuremath{-}1}$ data sample collected with the Belle detector at $\ensuremath{\Upsilon}(4S)$ and at $60\mathrm{MeV}$ below the resonance. The yield of prompt $J/\ensuremath{\psi}$ mesons in the $\ensuremath{\Upsilon}(4S)$ sample is compatible with that of continuum production; we set an upper limit $B(\ensuremath{\Upsilon}(4S)\ensuremath{\rightarrow}J/\ensuremath{\psi}X)l1.9\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$ at the $95%$ confidence level, and find $\ensuremath{\sigma}({e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}J/\ensuremath{\psi}X)\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}1.47\ifmmode\pm\else\textpm\fi{}0.10\ifmmode\pm\else\textpm\fi{}0.13\mathrm{pb}$. The cross sections for prompt $\ensuremath{\psi}(2S)$ and direct $J/\ensuremath{\psi}$ are measured. The $J/\ensuremath{\psi}$ momentum spectrum, production angle distribution, and polarization are studied.
53 citations
TL;DR: In this article, the decay amplitudes of helicity states of the J/ψK ∗ system were determined from the full angular distribution of the final state particles in the transversity basis.
TL;DR: In this article, an observation of mixing-induced $CP$ violation and a measurement of the $CP}$ violation parameter with the Belle detector at the KEKB asymmetric {e}+}{e}^{\ensuremath{-}}$ collider are described.
Abstract: This article describes an observation of mixing-induced $\mathrm{CP}$ violation and a measurement of the $\mathrm{CP}$ violation parameter, $\mathrm{sin}2{\ensuremath{\varphi}}_{1},$ with the Belle detector at the KEKB asymmetric ${e}^{+}{e}^{\ensuremath{-}}$ collider. Using a data sample of $29.1 {\mathrm{fb}}^{\ensuremath{-}1}$ recorded on the $\ensuremath{\Upsilon}(4S)$ resonance that contains 31.3 million $B\overline{B}$ pairs, we reconstruct decays of neutral B mesons to the following $\mathrm{CP}$ eigenstates: $J/\ensuremath{\psi}{K}_{S}^{0},$ $\ensuremath{\psi}{(2S)K}_{S}^{0},$ ${\ensuremath{\chi}}_{c1}{K}_{S}^{0},$ ${\ensuremath{\eta}}_{c}{K}_{S}^{0},$ $J/\ensuremath{\psi}{K}_{L}^{0}$ and $J/\ensuremath{\psi}{K}^{*0}.$ The flavor of the accompanying B meson is identified by combining information from primary and secondary leptons, ${K}^{\ifmmode\pm\else\textpm\fi{}}$ mesons, $\ensuremath{\Lambda}$ baryons, slow and fast pions. The proper-time interval between the two B meson decays is determined from the distance between the two decay vertices measured with a silicon vertex detector. The result $\mathrm{sin}2{\ensuremath{\varphi}}_{1}=0.99\ifmmode\pm\else\textpm\fi{}0.14(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.06(\mathrm{syst})$ is obtained by applying a maximum likelihood fit to the 1137 candidate events. We conclude that there is large $\mathrm{CP}$ violation in the neutral B meson system. A zero value for $\mathrm{sin}2{\ensuremath{\varphi}}_{1}$ is ruled out by more than six standard deviations.
TL;DR: In this paper, the branching fraction for the semileptonic B decay B 0 →D + l − ν, where l− can be either an electron or a muon, was measured.
TL;DR: In this paper, a study of B meson decays to the pseudoscalar vector final state ρπ using 31.9×106 B B events collected with the Belle detector at KEKB is presented.
TL;DR: In this paper, the invariant mass and polarization distributions for the K − K ∗0 and K−K0S subsystems have been studied, and significant signals are found for the B→D (∗) K − k ∗ 0 and B−→D0K−K 0S decay modes.
TL;DR: In this article, the lifetime difference of mesons decaying into the state and the even eigenstate of the mixing parameter was measured using data collected near the Belle detector at KEKB.
Abstract: We report a measurement of the ${D}^{0}\ensuremath{-}{\overline{D}}^{0}$ mixing parameter ${y}_{\mathrm{CP}}$ using $23.4{\mathrm{fb}}^{\ensuremath{-}1}$ of data collected near the $\ensuremath{\Upsilon}(4S)$ resonance with the Belle detector at KEKB. ${y}_{\mathrm{CP}}$ is measured from the lifetime difference of ${D}^{0}$ mesons decaying into the ${K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}$ state and the $\mathrm{CP}$-even eigenstate ${K}^{\ensuremath{-}}{K}^{+}$. We find ${y}_{\mathrm{CP}}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}(\ensuremath{-}0.5\ifmmode\pm\else\textpm\fi{}{1.0}_{\ensuremath{-}0.8}^{+0.7})\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}2}$, where the first error is statistical and the second is systematic, corresponding to a $95%$ confidence interval $\ensuremath{-}0.030l{y}_{\mathrm{CP}}l0.020$.
TL;DR: In this paper, the first observations of the Cabibbo-suppressed decays were made and the first evidence for the non-resonant decay was given for W-exchange diagrams attributed to exchange diagrams.
TL;DR: In this article, the first observation of a B meson decay that is not accessible by a direct spectator process was reported, with a branching fraction B(B(0]->D(+)(s)K-) = 4.6(+1.2)(-1.1)+/-1.3) x 10(-5).
Abstract: We report the first observation of a B meson decay that is not accessible by a direct spectator process. The channel B(0)-->D(+)(s)K- is found in a sample of 85 x 10(6) BB; events, collected with the Belle detector at KEKB, with a branching fraction B(B(0)-->D(+)(s)K-)=(4.6(+1.2)(-1.1)+/-1.3) x 10(-5). We also obtain evidence for the B0-->D(+)(s)pi(-) decay with branching fraction B(B0-->D(+)(s)pi(-))=(2.4(+1.0)(-0.8)+/-0.7) x 10(-5). This value may be used to extract a model-dependent value of |V(ub)|.
TL;DR: In this paper, a measurement of the Cabibbo-Kobayashi-Maskawa (CKM) matrix element |Vcb| using a 10.2 −1 data sample recorded at the ϒ(4S) resonance with the Belle detector at the KEKB asymmetric e+e− storage ring is presented.
TL;DR: In this article, the authors reported the results of a study of two-body B meson decays to the complete set of $K\ensuremath{pi,$ $\ensureMath{pi},$ $\ENSuremath{\pi}µ,$ and $K \overline{K}$ final states.
Abstract: We report the results of a study of two-body B meson decays to the complete set of $K\ensuremath{\pi},$ $\ensuremath{\pi}\ensuremath{\pi},$ and $K\overline{K}$ final states. The study is performed on a data sample of $31.7\ifmmode\pm\else\textpm\fi{}0.3$ million $B\overline{B}$ events recorded on the $\ensuremath{\Upsilon}(4\mathrm{S})$ resonance by the Belle experiment at KEKB. We observe significant signals in all $K\ensuremath{\pi}$ final states and in the ${\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ and ${\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{0}$ final states. We set limits on the ${\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0}$ and $K\overline{K}$ final states. A search is performed for partial-rate asymmetries between conjugate states for flavor-specific final states.
TL;DR: In this article, the authors reported the results of a search for the rare baryonic decays in a data set of $31.7 million events collected by the Belle detector at the KEKB collider.
Abstract: We report the results of a search for the rare baryonic decays ${B}^{0}\ensuremath{\rightarrow}p\overline{p},$ $\ensuremath{\Lambda}\overline{\ensuremath{\Lambda}},$ and ${B}^{+}\ensuremath{\rightarrow}p\overline{\ensuremath{\Lambda}}.$ The analysis is based on a data set of $31.7\ifmmode\times\else\texttimes\fi{}{10}^{6}B\overline{B}$ events collected by the Belle detector at the KEKB ${e}^{+}{e}^{\ensuremath{-}}$ collider. No statistically significant signals are found, and we set branching fraction upper limits $\mathcal{B}{(B}^{0}\ensuremath{\rightarrow}p\overline{p})l1.2\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6},$ $\mathcal{B}{(B}^{0}\ensuremath{\rightarrow}\ensuremath{\Lambda}\overline{\ensuremath{\Lambda}})l1.0\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6},$ and $\mathcal{B}{(B}^{+}\ensuremath{\rightarrow}p\overline{\ensuremath{\Lambda}})l2.2\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$ at the 90% confidence level.
TL;DR: The production of the χ c 2 charmonium state in two-photon collisions has been measured with the Belle detector at the KEKB e + e − collider as mentioned in this paper.
TL;DR: In this article, the authors present a measurement of $CP$-violating asymmetries in the decays of a neutral $B$ meson based on the Belle detector at the KEKB asymmetric energy collider.
Abstract: We present a measurement of $CP$-violating asymmetries in ${B}^{0}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ decays based on a $41.8\text{ }{\mathrm{f}\mathrm{b}}^{\ensuremath{-}1}$ data sample collected at the $\ensuremath{\Upsilon}(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy ${e}^{+}{e}^{\ensuremath{-}}$ collider. We fully reconstruct one neutral $B$ meson as a ${B}^{0}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ $CP$ eigenstate and identify the flavor of the accompanying $B$ meson from its decay products. From the asymmetry in the distribution of the time intervals between the two $B$ meson decay points, we obtain the $CP$-violating asymmetry parameters ${\mathcal{S}}_{\ensuremath{\pi}\ensuremath{\pi}}=\ensuremath{-}{1.21}_{\ensuremath{-}0.27}^{+0.38}(\mathrm{s}\mathrm{t}\mathrm{a}\mathrm{t}{)}_{\ensuremath{-}0.13}^{+0.16}(\mathrm{s}\mathrm{y}\mathrm{s}\mathrm{t})$ and ${\mathcal{A}}_{\ensuremath{\pi}\ensuremath{\pi}}=+{0.94}_{\ensuremath{-}0.31}^{+0.25}(\mathrm{s}\mathrm{t}\mathrm{a}\mathrm{t})\ifmmode\pm\else\textpm\fi{}0.09(\mathrm{s}\mathrm{y}\mathrm{s}\mathrm{t})$.
TL;DR: In this paper, the Belle detector at KEKB was used to study the decay modes of the B decays to charmed baryons with four-, three-and two-body final states.
Abstract: Using $29.1{\mathrm{fb}}^{\ensuremath{-}1}$ of data accumulated at the $\ensuremath{\Upsilon}(4S)$ with the Belle detector at KEKB, we have studied the decay modes ${B}^{0}\ensuremath{\rightarrow}{\ensuremath{\Lambda}}_{c}^{+}\overline{p}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}},$ ${B}^{\ensuremath{-}}\ensuremath{\rightarrow}{\ensuremath{\Lambda}}_{c}^{+}\overline{p}{\ensuremath{\pi}}^{\ensuremath{-}},$ and ${B}^{0}\ensuremath{\rightarrow}{\ensuremath{\Lambda}}_{c}^{+}\overline{p}.$ We report branching fractions of exclusive B decays to charmed baryons with four-, three- and two-body final states, including intermediate ${\ensuremath{\Sigma}}_{c}^{++}$ and ${\ensuremath{\Sigma}}_{c}^{0}$ states. We observed ${B}^{0}\ensuremath{\rightarrow}{\ensuremath{\Sigma}}_{c}{(2455)}^{++}\overline{p}{\ensuremath{\pi}}^{\ensuremath{-}}$ for the first time with a branching fraction of ${(2.38}_{\ensuremath{-}0.55}^{+0.63}\ifmmode\pm\else\textpm\fi{}0.41\ifmmode\pm\else\textpm\fi{}0.62)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$ and observed evidence for the two-body decay ${B}^{\ensuremath{-}}\ensuremath{\rightarrow}{\ensuremath{\Sigma}}_{c}{(2455)}^{0}\overline{p}$ with a branching fraction of ${(0.45}_{\ensuremath{-}0.19}^{+0.26}\ifmmode\pm\else\textpm\fi{}0.07\ifmmode\pm\else\textpm\fi{}0.12)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}.$ We also set improved upper limits for the two-body decays ${B}^{0}\ensuremath{\rightarrow}{\ensuremath{\Lambda}}_{c}^{+}\overline{p}$ and ${B}^{\ensuremath{-}}\ensuremath{\rightarrow}{\ensuremath{\Sigma}}_{c}{(2520)}^{0}\overline{p}.$
TL;DR: The lifetimes of the B(0) and B- mesons are extracted from 29.1 fb(-1) of data collected with the Belle detector at the KEK B factory, measuring the decay length differences of neutral and charged B meson pairs.
Abstract: The lifetimes of the B0bar and B- mesons are extracted from 29.1/fb of data collected with the Belle detector at the KEK B-factory. A fit to the decay length differences of neutral and charged B meson pairs, measured in events where one of the B mesons is fully reconstructed in several hadronic modes, yields tau_B0bar = 1.554 +/- 0.030(stat) +/- 0.019(syst) ps, tau_B- = 1.695 +/- 0.026(stat) +/- 0.015(syst) ps, and tau_B-/tau_B0bar = 1.091 +/- 0.023(stat) +/- 0.014(syst).
TL;DR: In this article, the authors report the first observation of color-suppressed B(B( 0)->D(0)pi(0), D(0)-pi( 0), D0eta, and D0omega decays, and evidence for B( 0]->D(*0)eta and D(*0)-omega.
Abstract: We report the first observation of color-suppressed B( 0)-->D(0)pi(0), D(*0)pi(0), D0eta, and D0omega decays, and evidence for B( 0)-->D(*0)eta and D(*0)omega. The branching fractions are B(B( 0)-->D0pi(0)) = (3.1 +/- 0.4 +/- 0.5)x10(-4), B(B( 0) -->D(*0)pi(0)) = (2.7(+0.8+0.5)(-0.7-0.6))x10(-4), B(B( 0) --> D0eta) = (1.4(+0.5)(-0.4) +/- 0.3)x10(-4), B(B( 0) --> D0omega) = (1.8 +/- 0.5(+0.4)(-0.3))x10(-4), and we set 90% confidence level upper limits of B(B( 0) --> D(*0)eta) D(*0)omega)<7.9 x 10(-4). The analysis is based on a data sample of 21.3 fb(-1) collected at the Upsilon(4S) resonance by the Belle detector at the KEKB e(+)e(-) collider.
TL;DR: In this paper, a 41.8 fb−1 data sample collected at the ϒ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e− collider was used to reconstruct one neutral B meson as a B 0 (B 0 )→η′K S 0 CP eigenstate and identify the flavor of the accompanying B from its decay products.
TL;DR: In this paper, the first observation of chi(c2) production in B meson decays was reported, where they found an inclusive B-->chi(c 2)X branching fraction of (1.80(+0.23)(-0.28)+/-0.26) x 10(-3).
Abstract: We report the first observation of chi(c2) production in B meson decays. We find an inclusive B-->chi(c2)X branching fraction of (1.80(+0.23)(-0.28)+/-0.26) x 10(-3). The data set, collected with the Belle detector at the KEKB e(+)e(-) collider, consists of 31.9 x 10(6) BB events. We also present branching fractions and momentum spectra for both chi(c1) and chi(c2) production.
TL;DR: In this article, the authors measured the oscillation frequency of B0-B 0 mixing using 29.1 Ã −1 −1 of data collected with the Belle detector at KEKB and obtained Δm d = (0.528±0.011) ps −1, where the first error is statistical and the second error is systematic.
TL;DR: In this paper, a measurement of the electron spectrum from inclusive semileptonic B decay, using 5.1 × 4S data collected with the Belle detector, was presented, and the branching fraction, B (B→Xe + ν)=(10.90±0.49)%, with minimal model dependence.