Showing papers by "D. M. Asner published in 2008"
Posted Content•
TL;DR: In this article, a detailed study of the expected performance of the ATLAS detector is presented, together with the reconstruction of tracks, leptons, photons, missing energy and jets, along with the performance of b-tagging and the trigger.
Abstract: A detailed study is presented of the expected performance of the ATLAS detector. The reconstruction of tracks, leptons, photons, missing energy and jets is investigated, together with the performance of b-tagging and the trigger. The physics potential for a variety of interesting physics processes, within the Standard Model and beyond, is examined. The study comprises a series of notes based on simulations of the detector and physics processes, with particular emphasis given to the data expected from the first years of operation of the LHC at CERN.
1,160 citations
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Ludwig Maximilian University of Munich1, Graduate University for Advanced Studies2, University of Edinburgh3, Sapienza University of Rome4, Syracuse University5, Carleton University6, Durham University7, Karlsruhe Institute of Technology8, RWTH Aachen University9, Fermilab10, Queen Mary University of London11, University of Notre Dame12, Technische Universität München13, Max Planck Society14, Technical University of Dortmund15, University of Savoy16, International Centre for Theoretical Physics17, National Central University18, University of Hawaii at Manoa19, University of Bergen20, CERN21, University of Liverpool22, Cornell University23, University of Florida24, University of Calabria25, University of Paris26, University of Cambridge27, Charles University in Prague28, Imperial College London29, ETH Zurich30, Jožef Stefan Institute31, Folkwang University of the Arts32, University of Turin33, University of Warwick34, University of Pisa35, University of Oxford36, University of Ljubljana37, Institute on Taxation and Economic Policy38, Technion – Israel Institute of Technology39, University of Zurich40, California Institute of Technology41, Nagoya University42, Saga University43, University of Regensburg44, Moscow State University45, University of Warsaw46, Rensselaer Polytechnic Institute47, University of Genoa48, Wayne State University49, École Polytechnique50, University of Pavia51, University of Clermont-Ferrand52, University of Chicago53, École Polytechnique Fédérale de Lausanne54, Autonomous University of Barcelona55, University of Bern56, Lancaster University57, Brookhaven National Laboratory58, Heidelberg University59, University of Bologna60, University of Hamburg61
TL;DR: In this article, the authors provide a coherent, up-to-date picture of the status of flavour physics before the start of the LHC and initiate activities on the path towards integrating information on NP from high-pT and flavour data.
Abstract: With the advent of the LHC, we will be able to probe New Physics (NP) up to energy scales almost one order of magnitude larger than it has been possible with present accelerator facilities. While direct detection of new particles will be the main avenue to establish the presence of NP at the LHC, indirect searches will provide precious complementary information, since most probably it will not be possible to measure the full spectrum of new particles and their couplings through direct production. In particular, precision measurements and computations in the realm of flavour physics are expected to play a key role in constraining the unknown parameters of the Lagrangian of any NP model emerging from direct searches at the LHC. The aim of Working Group 2 was twofold: on one hand, to provide a coherent, up-to-date picture of the status of flavour physics before the start of the LHC; on the other hand, to initiate activities on the path towards integrating information on NP from high-pT and flavour data.
149 citations
Posted Content•
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Carleton University1, University of Tennessee2, University of Notre Dame3, University of Milan4, Joint Institute for Nuclear Research5, Peking University6, Aix-Marseille University7, Academia Sinica8, University of Paris-Sud9, Tsinghua University10, Argonne National Laboratory11, University of Science and Technology of China12, Zhejiang University13, Humboldt University of Berlin14, Chinese Academy of Sciences15, University of Hawaii at Manoa16, University of Valencia17, University of Victoria18, University of Barcelona19, Oak Ridge National Laboratory20, University of Savoy21, Wuhan University22, Nankai University23, Central China Normal University24, China Center of Advanced Science and Technology25, Shandong University26, National University of Defense Technology27
TL;DR: In this paper, the authors provide detailed discussion on important topics in tau-charm physics that will be explored during the next few years at \bes3. Both theoretical and experimental issues are covered, including extensive reviews of recent theoretical developments and experimental techniques.
Abstract: This physics book provides detailed discussions on important topics in $\tau$-charm physics that will be explored during the next few years at \bes3 . Both theoretical and experimental issues are covered, including extensive reviews of recent theoretical developments and experimental techniques. Among the subjects covered are: innovations in Partial Wave Analysis (PWA), theoretical and experimental techniques for Dalitz-plot analyses, analysis tools to extract absolute branching fractions and measurements of decay constants, form factors, and CP-violation and \DzDzb-oscillation parameters. Programs of QCD studies and near-threshold tau-lepton physics measurements are also discussed.
90 citations
University of Illinois at Urbana–Champaign1, Indiana University2, University of Kansas3, Luther College4, University of Minnesota5, Northwestern University6, University of Oxford7, University at Buffalo8, University of Pittsburgh9, University of Puerto Rico10, Purdue University11, Rensselaer Polytechnic Institute12, University of Rochester13, Syracuse University14, Wayne State University15, University of Bristol16, Carleton University17, Carnegie Mellon University18, University of Chicago19, Cornell University20, University of Florida21, George Mason University22
TL;DR: In this paper, the branching ratio of the purely leptonic decay of the D{sup +} meson was measured with unprecedented precision as B(D{sup+}yields}{mu}{sup +}{nu})=(3.82{+-}0.32{+ − 0.09)x10{sup -4.
Abstract: We measure the branching ratio of the purely leptonic decay of the D{sup +} meson with unprecedented precision as B(D{sup +}{yields}{mu}{sup +}{nu})=(3.82{+-}0.32{+-}0.09)x10{sup -4}, using 818 pb{sup -1} of data taken on the {psi}(3770) resonance with the CLEO-c detector at the CESR collider. We use this determination to derive a value for the pseudoscalar decay constant f{sub D{sup +}}, combining with measurements of the D{sup +} lifetime and assuming |V{sub cd}|=|V{sub us}|. We find f{sub D{sup +}}=(205.8{+-}8.5{+-}2.5) MeV. The decay rate asymmetry ({gamma}(D{sup +}{yields}{mu}{sup +}{nu})-{gamma}(D{sup -}{yields}{mu}{sup -}{nu})/{gamma}(D{sup +}{yields}{mu}{sup +}{nu})+{gamma}(D{sup -}{yields}{mu}{sup -}{nu}))=0.08{+-}0.08, consistent with no CP violation. We also set 90% confidence level upper limits on B(D{sup +}{yields}{tau}{sup +}{nu})<1.2x10{sup -3} and B(D{sup +}{yields}e{sup +}{nu})<8.8x10{sup -6}.
89 citations
University of Pittsburgh1, University of Puerto Rico at Mayagüez2, Purdue University3, Rensselaer Polytechnic Institute4, University of Rochester5, Syracuse University6, Wayne State University7, University of Bristol8, Carleton University9, Carnegie Mellon University10, University of Chicago11, Cornell University12, University of Florida13, George Mason University14, University of Illinois at Urbana–Champaign15, Indiana University16, University of Kansas17, Luther College18, University of Minnesota19, Northwestern University20, University of Oxford21, University at Buffalo22
TL;DR: In this article, a non-SM-like CP-odd Higgs boson (a{sub 1}{sup 0}) decaying to {tau}{sup+tau-sup -} or {mu}{sup +}{mu-sup −} in radiative decays of the {upsilon}(1S) was found, and upper limits on the product branching ratios were set.
Abstract: We search for a non-SM-like CP-odd Higgs boson (a{sub 1}{sup 0}) decaying to {tau}{sup +}{tau}{sup -} or {mu}{sup +}{mu}{sup -} in radiative decays of the {upsilon}(1S). No significant signal is found, and upper limits on the product branching ratios are set. Our {tau}{sup +}{tau}{sup -} results are almost 2 orders of magnitude more stringent than previous upper limits. Our data provide no evidence for a Higgs state with a mass of 214 MeV decaying to {mu}{sup +}{mu}{sup -}, previously proposed as an explanation for 3 {sigma}{sup +}{yields}p{mu}{sup +}{mu}{sup -} events observed by the HyperCP experiment. Our results constrain NMSSM models.
78 citations
Wayne State University1, University of Bristol2, Carleton University3, Carnegie Mellon University4, University of Chicago5, Cornell University6, University of Florida7, George Mason University8, University of Illinois at Urbana–Champaign9, Indiana University10, University of Kansas11, Luther College12, University of Minnesota13, Northwestern University14, University of Oxford15, University at Buffalo16, University of Pittsburgh17, University of Puerto Rico18, Purdue University19, Rensselaer Polytechnic Institute20, University of Rochester21, Syracuse University22
TL;DR: In this paper, the authors performed a Dalitz plot analysis of D{sup +}{yields}K{sup -{pi}S wave decay with the CLEO-c data set of 572 pb {sup -1} of e{sup+}e{sup-} collisions accumulated at the {psi}(3770).
Abstract: We perform a Dalitz plot analysis of D{sup +}{yields}K{sup -}{pi}{sup +}{pi}{sup +} decay with the CLEO-c data set of 572 pb{sup -1} of e{sup +}e{sup -} collisions accumulated at the {psi}(3770). This corresponds to 1.6x10{sup 6} D{sup +}D{sup -} pairs from which we select 140 793 candidate events with a small background of 1.1%. We compare our results with previous measurements using the isobar model. We modify the isobar model with an improved description of some of the contributing resonances and get better agreement with our data. We also consider a quasi-model-independent approach and measure the magnitude and phase of the contributing K{pi} S wave in the range of invariant masses from the threshold to the maximum in this decay. This gives an improved description of our data over the isobar model. Finally we allow for an isospin-two {pi}{sup +}{pi}{sup +} S wave contribution and find that adding this to both the isobar model and the quasi-model-independent approach gives the best description of our data.
57 citations
Cornell University1, University of Florida2, George Mason University3, University of Illinois at Urbana–Champaign4, Indiana University5, University of Kansas6, Luther College7, University of Minnesota8, Northwestern University9, University of Oxford10, University at Buffalo11, University of Pittsburgh12, University of Puerto Rico13, Purdue University14, Rensselaer Polytechnic Institute15, University of Rochester16, Syracuse University17, Wayne State University18, University of Bristol19, Carleton University20, Carnegie Mellon University21, University of Chicago22
TL;DR: In this paper, the branching fractions of D(s) meson decays were determined using double tag technique, where the branching fraction B(D(s)(+)-->K(-)K(+}pi(+)) = 5.50+/-0.23+/- 0.16% where the uncertainties are statistical and systematic, respectively.
Abstract: The branching fractions of D(s)(+/-) meson decays serve to normalize many measurements of processes involving charm quarks. Using 298 pb(-1) of e(+)e(-) collisions recorded at a center of mass energy of 4.17 GeV, we determine absolute branching fractions for eight D(s)(+/-) decays with a double tag technique. In particular we determine the branching fraction B(D(s)(+)-->K(-)K(+}pi(+))=(5.50+/-0.23+/-0.16)%, where the uncertainties are statistical and systematic, respectively. We also provide partial branching fractions for kinematic subsets of the K(-)K(+)pi(+) decay mode.
44 citations
Carleton University1, Carnegie Mellon University2, University of Chicago3, Cornell University4, University of Florida5, George Mason University6, University of Illinois at Urbana–Champaign7, Indiana University8, University of Kansas9, Luther College10, University of Minnesota11, Northwestern University12, University of Oxford13, University at Buffalo14, University of Pittsburgh15, University of Puerto Rico16, Purdue University17, Rensselaer Polytechnic Institute18, University of Rochester19, Syracuse University20, Wayne State University21, University of Bristol22
TL;DR: In this paper, the authors exploit the quantum coherence between pair-produced D{sup 0} and D{Sup 0} in {psi}(3770) decays to study charm mixing, which is characterized by the parameters x and y.
Abstract: We exploit the quantum coherence between pair-produced D{sup 0} and D{sup 0} in {psi}(3770) decays to study charm mixing, which is characterized by the parameters x and y, and to make a first determination of the relative strong phase {delta} between doubly Cabibbo-suppressed D{sup 0}{yields}K{sup +}{pi}{sup -} and Cabibbo-favored D{sup 0}{yields}K{sup +}{pi}{sup -}. We analyze a sample of 1.0x10{sup 6} D{sup 0}D{sup 0} pairs from 281 pb{sup -1} of e{sup +}e{sup -} collision data collected with the CLEO-c detector at E{sub cm}=3.77 GeV. By combining CLEO-c measurements with branching fraction input and time-integrated measurements of R{sub M}{identical_to}(x{sup 2}+y{sup 2})/2 and R{sub WS}{identical_to}{gamma}(D{sup 0}{yields}K{sup +}{pi}{sup -})/{gamma}(D{sup 0}{yields}K{sup +}{pi}{sup -}) from other experiments, we find cos{delta}=1.03{sub -0.17}{sup +0.31}{+-}0.06, where the uncertainties are statistical and systematic, respectively. In addition, by further including external measurements of charm mixing parameters, we obtain an alternate measurement of cos{delta}=1.10{+-}0.35{+-}0.07, as well as xsin{delta}=(4.4{sub -1.8}{sup +2.7}{+-}2.9)x10{sup -3} and {delta}=(22{sub -12-11}{sup +11+9}) deg.
41 citations
George Mason University1, University of Illinois at Urbana–Champaign2, Indiana University3, University of Kansas4, Luther College5, University of Minnesota6, Northwestern University7, University of Oxford8, University at Buffalo9, University of Pittsburgh10, University of Puerto Rico11, Purdue University12, Rensselaer Polytechnic Institute13, University of Rochester14, Syracuse University15, Wayne State University16, University of Bristol17, Carleton University18, Carnegie Mellon University19, University of Chicago20, Cornell University21, University of Florida22
TL;DR: In this paper, a search for $CP$ asymmetry in the singly Cabibbo-suppressed decay was conducted using the CLEO-c detector on the π(3770) resonance, and the authors found no evidence for violation either in specific two-body amplitudes or integrated over the entire phase space.
Abstract: We report on a search for $CP$ asymmetry in the singly Cabibbo-suppressed decay ${D}^{+}\ensuremath{\rightarrow}{K}^{+}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}$ using a data sample of $818\text{ }\text{ }{\mathrm{pb}}^{\ensuremath{-}1}$ accumulated with the CLEO-c detector on the $\ensuremath{\psi}(3770)$ resonance. A Dalitz-plot analysis is used to determine the amplitudes of the intermediate states. We find no evidence for $CP$ violation either in specific two-body amplitudes or integrated over the entire phase space. The $CP$ asymmetry in the latter case is measured to be $(\ensuremath{-}0.03\ifmmode\pm\else\textpm\fi{}0.84\ifmmode\pm\else\textpm\fi{}0.29)%$.
30 citations
Northwestern University1, University at Albany, SUNY2, University of Oklahoma3, University of Pittsburgh4, University of Puerto Rico5, Purdue University6, Rensselaer Polytechnic Institute7, University of Rochester8, Southern Methodist University9, Syracuse University10, Vanderbilt University11, Wayne State University12, Carleton University13, Carnegie Mellon University14, University of Chicago15, Cornell University16, University of Florida17, George Mason University18, University of Illinois at Urbana–Champaign19, Indiana University20, University of Kansas21, Luther College22, University of Minnesota23
TL;DR: Using a sample of 1.8 million mesons collected at the $\ensuremath{\psi}(3770)$ with the CLEO-c detector, semileptonic decays are studied through fits to the partial branching fractions obtained in five ${q}^{2}$ ranges.
Abstract: Using a sample of 1.8 million $D\overline{D}$ mesons collected at the $\ensuremath{\psi}(3770)$ with the CLEO-c detector, we study the semileptonic decays ${D}^{0}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{\ensuremath{-}}{e}^{+}{\ensuremath{
u}}_{e}$, ${D}^{+}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}{e}^{+}{\ensuremath{
u}}_{e}$, ${D}^{0}\ensuremath{\rightarrow}{K}^{\ensuremath{-}}{e}^{+}{\ensuremath{
u}}_{e}$, and ${D}^{+}\ensuremath{\rightarrow}{\overline{K}}^{0}{e}^{+}{\ensuremath{
u}}_{e}$. For the total branching fractions we find $\mathcal{B}({D}^{0}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{\ensuremath{-}}{e}^{+}{\ensuremath{
u}}_{e})=0.299(11)(9)%$, $\mathcal{B}({D}^{+}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}{e}^{+}{\ensuremath{
u}}_{e})=0.373(22)(13)%$, $\mathcal{B}({D}^{0}\ensuremath{\rightarrow}{K}^{\ensuremath{-}}{e}^{+}{\ensuremath{
u}}_{e})=3.56(3)(9)%$, and $\mathcal{B}({D}^{+}\ensuremath{\rightarrow}{\overline{K}}^{0}{e}^{+}{\ensuremath{
u}}_{e})=8.53(13)(23)%$, where the first error is statistical and the second systematic. In addition, form factors are studied through fits to the partial branching fractions obtained in five ${q}^{2}$ ranges. By combining our results with recent unquenched lattice calculations, we obtain $|{V}_{cd}|=0.217(9)(4)(23)$ and $|{V}_{cs}|=1.015(10)(11)(106)$, where the final error is theoretical.
26 citations
University of Pittsburgh1, University of Puerto Rico2, Purdue University3, Rensselaer Polytechnic Institute4, University of Rochester5, Syracuse University6, Wayne State University7, Carleton University8, Carnegie Mellon University9, University of Chicago10, Cornell University11, University of Florida12, George Mason University13, University of Illinois at Urbana–Champaign14, Indiana University15, University of Kansas16, Luther College17, University of Minnesota18, Northwestern University19, University at Buffalo20
TL;DR: In this article, a search for lepton flavor violation (LFV) in the bottomonium system was described and a multidimensional likelihood fitting with probability density function shapes measured from independent data samples was performed.
Abstract: In this Letter, we describe a search for lepton flavor violation (LFV) in the bottomonium system. We search for leptonic decays Upsilon(nS)-->mutau (n=1, 2, and 3) using the data collected with the CLEO III detector. We identify the tau lepton using its leptonic decay nu_{tau}nu[over ]_{e}e and utilize multidimensional likelihood fitting with probability density function shapes measured from independent data samples. We report our estimates of 95% C.L. upper limits on LFV branching fractions of Upsilon mesons. We interpret our results in terms of the exclusion plot for the energy scale of a hypothetical new interaction versus its effective LFV coupling in the framework of effective field theory.
University of Rochester1, Southern Methodist University2, Syracuse University3, Wayne State University4, Carleton University5, Carnegie Mellon University6, University of Chicago7, Cornell University8, University of Florida9, George Mason University10, University of Illinois at Urbana–Champaign11, Indiana University12, University of Kansas13, Luther College14, University of Minnesota15, Northwestern University16, University at Albany, SUNY17, University at Buffalo18, University of Oklahoma19, University of Pittsburgh20, University of Puerto Rico21, Purdue University22, Rensselaer Polytechnic Institute23
TL;DR: In this article, the authors present measurements of D{yields}K{sub S}{sup 0,pi} and D{ yields} K{sub L {sub S,pi,psi} branching fractions using 281 pb{sup -1} of {psi(3770) data at the CLEO-c experiment, with an asymmetry of R(D{sup 0})=0.108{+-}0.024.
Abstract: We present measurements of D{yields}K{sub S}{sup 0}{pi} and D{yields}K{sub L}{sup 0}{pi} branching fractions using 281 pb{sup -1} of {psi}(3770) data at the CLEO-c experiment. We find that B(D{sup 0}{yields}K{sub S}{sup 0}{pi}{sup 0}) is larger than B(D{sup 0}{yields}K{sub L}{sup 0}{pi}{sup 0}), with an asymmetry of R(D{sup 0})=0.108{+-}0.025{+-}0.024. For B(D{sup +}{yields}K{sub S}{sup 0}{pi}{sup +}) and B(D{sup +}{yields}K{sub L}{sup 0}{pi}{sup +}), we observe no measurable difference; the asymmetry is R(D{sup +})=0.022{+-}0.016{+-}0.018. The D{sup 0} asymmetry is consistent with the value based on the U-spin prediction A(D{sup 0}{yields}K{sup 0}{pi}{sup 0})/A(D{sup 0}{yields}K{sup 0}{pi}{sup 0})=-tan{sup 2}{theta}{sub C}, where {theta}{sub C} is the Cabibbo angle.
University of Puerto Rico at Mayagüez1, Purdue University2, Rensselaer Polytechnic Institute3, University of Rochester4, Syracuse University5, Wayne State University6, University of Bristol7, Carleton University8, Carnegie Mellon University9, University of Chicago10, Cornell University11, University of Florida12, George Mason University13, University of Illinois at Urbana–Champaign14, Indiana University15, University of Kansas16, Luther College17, University of Minnesota18, Northwestern University19, University of Oxford20, University at Buffalo21, University of Pittsburgh22
TL;DR: In this paper, branching fractions for the decays {psi}(2S){yields}h+J/{psi], where h=any, {pi}{sup +}e{sup-} collision data collected with the CLEO detector.
Abstract: We report determination of branching fractions for the decays {psi}(2S){yields}h+J/{psi}, where h=any, {pi}{sup +}{pi}{sup -}, {pi}{sup 0}{pi}{sup 0}, {eta}, {pi}{sup 0}, and {gamma}{gamma} through {chi}{sub c0,1,2}. These measurements use 27M {psi}(2S) decays produced in e{sup +}e{sup -} collision data collected with the CLEO detector. The resulting branching fractions and ratios thereof improve upon previously achieved precision in all cases, and in combination with other measurements permit determination of B({chi}{sub cJ}{yields}{gamma}J/{psi}) and B({psi}(2S){yields}light hadrons)
University of Florida1, George Mason University2, University of Illinois at Urbana–Champaign3, Indiana University4, University of Kansas5, Luther College6, University of Minnesota7, Northwestern University8, University of Oxford9, University at Buffalo10, University of Pittsburgh11, University of Puerto Rico12, Purdue University13, Rensselaer Polytechnic Institute14, University of Rochester15, Syracuse University16, Wayne State University17, University of Bristol18, Carleton University19, Carnegie Mellon University20, University of Chicago21, Cornell University22
TL;DR: This is the first observation of a charmed meson decaying into a baryon-antibaryon final state in the decay Ds+-->pn.
Abstract: Using e{sup +}e{sup -}{yields}D{sub s}*{sup -}D{sub s}{sup +} data collected near the peak D{sub s} production energy, E{sub cm}=4170 MeV, with the CLEO-c detector, we present the first observation of the decay D{sub s}{sup +}{yields}pn. We measure a branching fraction B(D{sub s}{sup +}{yields}pn)=(1.30{+-}0.36{sub -0.16}{sup +0.12})x10{sup -3}. This is the first observation of a charmed meson decaying into a baryon-antibaryon final state.
California Institute of Technology1, Carleton University2, CERN3, ETH Zurich4, University of Genoa5, University of Maryland, College Park6, McGill University7, Technische Universität München8, University of Notre Dame9, University of Paris-Sud10, University of Padua11, University of Pisa12, Queen Mary University of London13, Sapienza University of Rome14, University of Sassari15, Spanish National Research Council16, University of Valencia17, University of Victoria18, University of Warwick19
TL;DR: The SuperB Workshop as discussed by the authors evaluated the capability of a high-luminosity flavor factory that can gather a data sample of 50 to 75 /ab in five years to elucidate New Physics phenomena unearthed at the LHC.
Abstract: The sixth SuperB Workshop was convened in response to questions posed by the INFN Review Committee, evaluating the SuperB project at the request of INFN. The working groups addressed the capability of a high-luminosity flavor factory that can gather a data sample of 50 to 75 /ab in five years to elucidate New Physics phenomena unearthed at the LHC. This report summarizes the results of the Workshop.
University of Minnesota1, Northwestern University2, University at Albany, SUNY3, University of Oklahoma4, University of Pittsburgh5, University of Puerto Rico at Mayagüez6, Purdue University7, Rensselaer Polytechnic Institute8, University of Rochester9, Southern Methodist University10, Syracuse University11, Vanderbilt University12, Wayne State University13, Carleton University14, Carnegie Mellon University15, University of Chicago16, Cornell University17, University of Florida18, George Mason University19, University of Illinois at Urbana–Champaign20, Indiana University21, University of Kansas22, Luther College23
TL;DR: By using 1.8x10{sup 6} DD pairs, Wang et al. as discussed by the authors measured B(D{sup 0}yields}{pi}{sup -}e{sup +}{nu}{sub e})=0.299(11)(9)%, B(d{sup plus}{yield's}{pi {sup 0}, e{sup+}nu {sub e}
Abstract: By using 1.8x10{sup 6} DD pairs, we have measured B(D{sup 0}{yields}{pi}{sup -}e{sup +}{nu}{sub e})=0.299(11)(9)%, B(D{sup +}{yields}{pi}{sup 0}e{sup +}{nu}{sub e})=0.373(22)(13)%, B(D{sup 0}{yields}K{sup -}e{sup +}{nu}{sub e})=3.56(3)(9)%, and B(D{sup +}{yields}K{sup 0}e{sup +}{nu}{sub e})=8.53(13)(23)% and have studied the q{sup 2} dependence of the form factors. By combining our results with recent lattice calculations, we obtain |V{sub cd}|=0.217(9)(4)(23) and |V{sub cs}|=1.015(10)(11)(106)
Carnegie Mellon University1, University of Chicago2, Cornell University3, University of Florida4, George Mason University5, University of Illinois at Urbana–Champaign6, Indiana University7, University of Kansas8, Luther College9, University of Minnesota10, Northwestern University11, University of Oxford12, University at Buffalo13, University of Pittsburgh14, University of Puerto Rico at Mayagüez15, Purdue University16, Rensselaer Polytechnic Institute17, University of Rochester18, Syracuse University19, Wayne State University20, University of Bristol21, Carleton University22
TL;DR: In this paper, the decays of {chi-sub bJ} to final states with open charm were investigated using the CLEO III detector, and the results confirmed the NRQCD predictions.
Abstract: Using {upsilon}(2S) and {upsilon}(3S) data collected with the CLEO III detector we have searched for decays of {chi}{sub bJ} to final states with open charm. We fully reconstruct D{sup 0} mesons with p{sub D{sup 0}}>2.5 GeV/c in three decay modes (K{sup -}{pi}{sup +}, K{sup -}{pi}{sup +}{pi}{sup 0}, and K{sup -}{pi}{sup -}{pi}{sup +}{pi}{sup +}) in coincidence with radiative transition photons that tag the production of one of the {chi}{sub bJ}(nP) states. Significant signals are obtained for the two J=1 states. Recent nonrelativistic QCD (NRQCD) calculations of {chi}{sub bJ}(nP){yields}ccX depend on one nonperturbative parameter per {chi}{sub bJ} triplet. The extrapolation from the observed D{sup 0}X rate over a limited momentum range to a full ccX rate also depends on these same parameters. Using our data to fit for these parameters, we extract results which agree well with NRQCD predictions, confirming the expectation that charm production is largest for the J=1 states. In particular, for J=1, our results are consistent with ccg accounting for about one-quarter of all hadronic decays.
University of Rochester1, Syracuse University2, Wayne State University3, Carleton University4, Carnegie Mellon University5, University of Chicago6, Cornell University7, University of Florida8, George Mason University9, University of Illinois at Urbana–Champaign10, Indiana University11, University of Kansas12, Luther College13, University of Minnesota14, Northwestern University15, University at Buffalo16, University of Pittsburgh17, University of Puerto Rico at Mayagüez18, Purdue University19, Rensselaer Polytechnic Institute20
TL;DR: In this paper, the authors studied exclusive {chi}{sub c 0,1,2} decays to four-hadron final states involving two charged and two neutral hadrons.
Abstract: We study exclusive {chi}{sub c0,1,2} decays to four-hadron final states involving two charged and two neutral hadrons: {pi}{sup +}{pi}{sup -}{pi}{sup 0}{pi}{sup 0}, K{sup +}K{sup -}{pi}{sup 0}{pi}{sup 0}, pp{pi}{sup 0}{pi}{sup 0}, K{sup +}K{sup -}{eta}{pi}{sup 0}, and K{sup {+-}}{pi}{sup {+-}}K{sup 0}{pi}{sup 0}. The {chi}{sub c} states are produced in radiative decays of 3.08x10{sup 6} {psi}(2S) resonance decays and observed in the CLEO detector. We also measure the largest substructure contributions to the modes {pi}{sup +}{pi}{sup -}{pi}{sup 0}{pi}{sup 0} and K{sup {+-}}{pi}{sup {+-}}K{sup 0}{pi}{sup 0}.