6533b7d1fe1ef96bd125cbb7
RESEARCH PRODUCT
Measurements of theB→Xsγbranching fraction and photon spectrum from a sum of exclusive final states
J. OcarizDouglas WrightI. J. ForsterT. J. HarrisonJ. W. GaryR. C. FieldJ. Va'vraF. SalvatoreJ. F. HirschauerJ.j. ReidyS. H. RobertsonA. SatpathyG. FinocchiaroV. LuthCorrado AngeliniD. J. BardB. BhuyanMarkus CristinzianiS. EmeryR. S. DubitzkyO. L. BuchmuellerBruce SchummJ. M. LoseccoV. B. GolubevM. S. AlamV. P. DruzhininC. BozziV. KloseK. HonscheidHerbert KochS. CurryG. TherinA. SnyderC. A. ChavezP. KimA. BuzzoR. J. BarlowJ. H. Von Wimmersperg-toellerN. B. SinevB. ViaudMaurizio PieriniN. ChevalierM. PosoccoF. SimonettoF. F. WilsonG. P. TaylorS. PacettiF. X. YumicevaR. CowanD. MonorchioI. NarskyH. W. ZhaoP. D. DaunceyMirco AndreottiMarcello RotondoA. M. EisnerHui LiH. U. FlaecherA. ZghicheR. J. WilsonG. BlaylockMatteo RamaM. J.j. JohnJ. ChauveauW. F. MaderR. H. SchindlerC. K. LaeP. LundR. L. FlackF. BucciL. M. CremaldiM. FritschS. S. HertzbachS. B. ZainG. De NardoG. RizzoY. GroysmanA. J. HartL. WildenL. BosisioS. K. SwainShanhui FanJ. StelzerS. PrellM. M. MacriS. J. SekulaA. JawaherySergio GrancagnoloA. PetzoldG. Hamel De MonchenaultR. S. PanviniJ. BroseA. CalcaterraYu G. KolomenskyC. RoatR. LiuC. LuD. JuddW. MengesAndrei GritsanS. A. MajewskiS. D. FoulkesG. CibinettoJie ZhangJames H CochranL.m. ZhangS. OttoC. M. CormackM. BondioliM. L. KocianD. S. BestDenis BernardC. J. FlaccoV. LombardoB. LewandowskiR. ContriW. D. HulsbergenD. P. StokerR. ClausF. BlancD. G. HitlinP. RankinMatteo NegriniA. SofferA. W. WeidemannPeter ElmerG. WagnerR. AleksanY. KaryotakisB. T. MeadowsF. GalloS. YeT. C. PetersenR. Ter-antonyanO. HamonG. RavenM. V. PurohitW. KozaneckiBruce MelladoM. WittgenP. J. ClarkJ. I. YiM. D. SokoloffC. M. BrownM. C. HodgkinsonA. OyangurenChunhui ChenA. B. BreonB. SpaanT. R. McmahonT. PiatenkoH. J. BultenK. PetersNicola NeriJames R. WilsonH. BriandC. M. HawkesT. SchalkA. D. BukinJ. C. DingfelderL. LanceriJ. P. LeesStéphane PlaszczynskiP. R. BurchatR. R. KoflerM. KrishnamurthyMichael KellyJ. L. RitchieA. P. OnuchinP. RoudeauH. P. PaarJ. E. BrauM. A. MazzoniI. KitayamaR. KroegerE. I. RosenbergBrandon L. HartfielJ. P. ColemanG. WormserX. GirouxA. J. EdwardsMaurizio BiasiniM. SpitznagelA. LazzaroT. M. HongM. LuD. DongM. SteinkeK. YiR. K. MommsenA. ChenMohamed H. AhmedB. A. PetersenC. L. BrownB. N. RatcliffD. E. WagonerC. GattoE. GraugesC. T. PotterM. C. SimaniF. AnulliD. BoutignyL. Del BuonoN. D. QiR. SchwierzM. G. WilsonMario GiorgiD. CôtéD. SuS. MorgantiV. PoireauSridhara DasuA. A. SalnikovA. T. WatsonR. EckmannWp VazquezM. PioppiG. S. AbramsD. A. RobertsF. E. TaylorA. N. YushkovA. M. EichenbaumS. DittongoV. HalyoB. ChengW. O. RuddickGabriele SimiT. SchroederM. PiccoloN. De GrootE. WonG. GrosdidierY. S. ZhuC. L. DavisJ. R. GaillardV. LepeltierL. GladneyJ. M. ThompsonU. LangeneggerH. K. HadavandW. DunwoodieU. EgedeHyun-chul KimV. E. BlinovM. T. AllenK. SuzukiC. L. EdgarK. A. UlmerH. MarsiskeC. H. ChengPaul JacksonOwen Rosser LongR. FacciniP. PatteriR. GametA. HöckerB. FranekS. RodierA. E. BlinovG. BatignaniC. C. YoungE. FeltresiM. 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PappagalloJ. M. RoneyLuca ListaK. A. GeorgeJ. G. SmithM. B. NikolichA. GaidotG. P. GopalAmanda WeinsteinG. W. LondonM. A. MazurR. J. ParryE. Di MarcoD. H. WrightC. PatrignaniA. CunhaV. TisserandW. RoethelMichael T RonanJ. StrubeL. PiemonteseE. GabathulerW. R. InnesF. C. PorterM. ZitoS. J. GowdyR. BarateSw. BanerjeeNatalie A. RoeH. B. CrawleyRoberto CalabreseB. C. Shensubject
Quantum chromodynamicsPhysicsSemileptonic decayNuclear and High Energy PhysicsParticle physics010308 nuclear & particles physicsBranching fractionElectron–positron annihilationPhoton energy01 natural sciencesParticle identificationNuclear physicsIsospin0103 physical sciencesB meson010306 general physicsdescription
Using 88.9 million BB events collected by the BaBar detector at the Y(4S), we measure the branching fraction for the radiative penguin process B -> X_s gamma from the sum of 38 exclusive final states. The inclusive branching fraction above a minimum photon energy E_gamma > 1.9 GeV is BF (b -> s gamma) = (3.27 +/- 0.18 (stat.) +0.55/-0.40 (syst.) +0.04/-0.09 (theory)) 10^-4. We also measure the isospin asymmetry between B^- -> X_s ubar gamma and B^0bar -> X_s dbar gamma to be Delta_0- = -0.006 +/- 0.058 (stat.) +/- 0.009 (syst.) +/- 0.024 (B^0bar / B^-). The photon energy spectrum is measured in the B rest frame, from which moments are derived for different values of the minimum photon energy. We present fits to the photon spectrum and moments which give the heavy-quark parameters m_b and mu_pi^2. The fitted parameters are consistent with those obtained from semileptonic B -> X_c l nu decays, and are useful inputs for the extraction of Vub from measurements of semileptonic B -> X_u l nu decays.
year | journal | country | edition | language |
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2005-09-14 | Physical Review D |