The Library

Measurement of b-hadron branching fractions for two-body decays into charmless charged hadrons

Tools

Back, J. J., Dossett, D., Gershon, T. J., Harrison, P. F., Kreps, Michal, Latham, Thomas, Pilar, T., Poluektov, Anton, Reid, Matthew M., Silva Coutinho, R., Whitehead, M. (Mark) and Williams, M. P. (2012) Measurement of b-hadron branching fractions for two-body decays into charmless charged hadrons. Journal of High Energy Physics, Volume 2012 (Number 10). Article number 37. ISSN 1029-8479

[img]
Preview
 PDF
WRAP_art%3A10.1007%2FJHEP10%282012%29037.pdf - Published Version - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader
Available under License Creative Commons Attribution.
Download (1111Kb) | Preview

Abstract

Based on data corresponding to an integrated luminosity of 0.37 fb−1 collected by the LHCb experiment in 2011, the following ratios of branching fractions are measured: B(B0→π+π−)/B(B0→K+π−)=0.262±0.009±0.017,(fs/fd)⋅B(B0s→K+K−)/B(B0→K+π−)=0.316±0.009±0.019,(fs/fd)⋅B(B0s→π+K−)/B(B0→K+π−)=0.074±0.006±0.006,(fd/fs)⋅B(B0→K+K−)/B(B0s→K+K−)=0.018+0.008−0.007±0.009,(fs/fd)⋅B(B0s→π+π−)/B(B0→π+π−)=0.050+0.011−0.009±0.004,B(Λ0b→pπ−)/B(Λ0b→pK−)=0.86±0.08±0.05, where the first uncertainties are statistical and the second systematic. Using the current world average of B(B0→K+π−) and the ratio of the strange to light neutral B meson production f s /f d measured by LHCb, we obtain: B(B0→π+π−)=(5.08±0.17±0.37)×10−6,B(B0s→K+K−)=(23.0±0.7±2.3)×10−6,B(B0s→π+K−)=(5.4±0.4±0.6)×10−6,B(B0→K+K−)=(0.11+0.05−0.04±0.06)×10−6,B(B0s→π+π−)=(0.95+0.21−0.17±0.13)×10−6.
The measurements of B(B0s→K+K−) , B(B0s→π+K−) and B(B0→K+K−) are the most precise to date. The decay mode B0s→π+π− is observed for the first time with a significance of more than 5σ.

Item Type: Journal Article
Subjects: Q Science > QC Physics
Divisions: Faculty of Science > Physics
Library of Congress Subject Headings (LCSH): Hadrons -- Decay, CP violation (Nuclear physics), Proton-proton interactions, Large Hadron Collider (France and Switzerland)
Journal or Publication Title: Journal of High Energy Physics
Publisher: Springer
ISSN: 1029-8479
Official Date: October 2012
Volume: Volume 2012
Number: Number 10
Article Number: Article number 37
Identification Number: 10.1007/JHEP10(2012)037
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Open Access
Funder: Brazil. Coordenação do Aperfeiçoamento de Pessoal de Nível Superior (CAPES), Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro (FAPERJ), Financiadora de Estudos e Projetos (Brazil) (FINEP), European Organization for Nuclear Research (CERN), Centre national de la recherche scientifique (France) (CNRS), Institut national de physique nucléaire et de physique des particules (IN2P3), Guo jia zi ran ke xue ji jin wei yuan hui (China) [National Natural Science Foundation of China] (NSFC), Germany. Bundesministerium für Bildung und Forschung (BMBF), Deutsche Forschungsgemeinschaft (DFG), Hermann von Helmholtz-Gemeinschaft Deutscher Forschungszentren (HGF), Max-Planck-Gesellschaft zur Förderung der Wissenschaften [Max Planck Society for the Advancement of Science], Science Foundation Ireland (SFI), Istituto nazionale di fisica nucleare (INFN), Stichting voor Fundamenteel Onderzoek der Materie (FOM) [Foundation for Fundamental Research on Matter], Nederlandse Organisatie voor Wetenschappelijk Onderzoek [Netherlands Organisation for Scientific Research] (NWO), SCSR (Poland), Autoritatea Nationala pentru Cercetare Stiintifica (ANCS), Russia (Federation). Ministerstvo obrazovanii︠a︡ i nauki [Ministry of Education and Science], Federalʹnoe agentstvo po atomnoĭ ėnergii (Russia), Spain. Ministerio de Ciencia e Innovación (MICINN), Galicia (Spain : Region). Xunta, Catalonia (Spain), Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung [Swiss National Science Foundation] (SNSF), Switzerland. Staatssekretariat für Ausbildung und Forschung (SER), Nat︠s︡ionalʹna akademii︠a︡ nauk Ukraïny (NAS), Science and Technology Facilities Council (Great Britain) (STFC), National Science Foundation (U.S.) (NSF), Seventh Framework Programme (European Commission) (FP7), Auvergne (France)
References:

[1] N. Cabibbo, Unitary symmetry and leptonic decays, Phys. Rev. Lett. 10 (1963) 531 [INSPIRE].
[2] M. Kobayashi and T. Maskawa, CP violation in the renormalizable theory of weak
interaction, Prog. Theor. Phys. 49 (1973) 652 [INSPIRE].
[3] R. Fleischer, New strategies to extract and from Bd
!
+
.
and Bs
!
K+ K. , Phys.
Lett. B 459 (1999) 306 [hep-ph/9903456] [INSPIRE].
[4] M. Gronau and J.L. Rosner, The role of Bs
!
K in determining the weak phase , Phys.
Lett. B 482 (2000) 71 [hep-ph/0003119] [INSPIRE].
[5] H.J. Lipkin, Is observed direct CP-violation in Bd
!
K+
.
due to new physics? Check
standard model prediction of equal violation in Bs
! K.
+
, Phys. Lett. B 621 (2005) 126
[hep-ph/0503022] [INSPIRE].
[6] R. Fleischer, Bs;d
!
; K; KK: status and prospects, Eur. Phys. J. C 52 (2007) 267
[arXiv:0705.1121] [INSPIRE].
[7] R. Fleischer and R. Knegjens, In pursuit of new physics with B0 s
!
K+ K. , Eur. Phys. J. C
71 (2011) 1532 [arXiv:1011.1096] [INSPIRE].
[8] BABAR collaboration, B. Aubert et al., Measurement of CP asymmetries and branching
fractions in B0
!!
+
.
, B0
!
K+
.
, B0
!
0 0
, B0
!
K0
0
and isospin analysis of
B
!
decays, arXiv:0807.4226 [INSPIRE].
[9] Belle collaboration, S. Lin et al., Di erence in direct charge-parity violation between
charged and neutral B meson decays, Nature 452 (2008) 332 [INSPIRE].
[10] CDF collaboration, T. Aaltonen et al., Measurements of direct CP-violating asymmetries in
charmless decays of strange bottom mesons and bottom baryons, Phys. Rev. Lett. 106 (2011)
181802 [arXiv:1103.5762] [INSPIRE].
[11] LHCb collaboration, R. Aaij et al., First evidence of direct CP-violation in charmless
two-body decays of B0 s
mesons, Phys. Rev. Lett. 108 (2012) 201601 [arXiv:1202.6251]
[INSPIRE].
[12] CDF collaboration, T. Aaltonen et al., Evidence for the charmless annihilation decay mode
B0 s
!
+
.
, Phys. Rev. Lett. 108 (2012) 211803 [arXiv:1111.0485] [INSPIRE].
[13] LHCb collaboration, J. Alves, A. Augusto et al., The LHCb detector at the LHC, 2008
JINST 3 S08005 [INSPIRE].
[14] V. Gligorov, C. Thomas and M. Williams, The HLT inclusive B triggers,
LHCb-PUB-2011-016 (2011).
[15] T. Sjostrand, S. Mrenna and P.Z. Skands, PYTHIA 6.4 physics and manual, JHEP 05
(2006) 026 [hep-ph/0603175] [INSPIRE].
[16] I. Belyaev et al., Handling of the generation of primary events in Gauss, the
LHCb simulation framework, Nucl. Sci. Symp. Conf. Rec. (2010) 1155.
[17] D. Lange, The EvtGen particle decay simulation package, Nucl. Instrum. Meth. A 462
(2001) 152 [INSPIRE].
[18] P. Golonka and Z. Was, PHOTOS Monte Carlo: a precision tool for QED corrections in Z
and W decays, Eur. Phys. J. C 45 (2006) 97 [hep-ph/0506026] [INSPIRE].
[19] GEANT4 collaboration, J. Allison et al., GEANT4 developments and applications, IEEE
Trans. Nucl. Sci. 53 (2006) 270.
[20] GEANT4 collaboration, S. Agostinelli et al., GEANT4: a simulation toolkit, Nucl. Instrum.
Meth. A 506 (2003) 250 [INSPIRE].
[21] M. Clemencic et al., The LHCb simulation application, Gauss: design, evolution and
experience, J. Phys. Conf. Ser. 331 (2011) 032023.
[22] M. Pivk and F.R. Le Diberder, SPlot: a statistical tool to unfold data distributions, Nucl.
Instrum. Meth. A 555 (2005) 356 [physics/0402083] [INSPIRE].
[23] ARGUS collaboration, H. Albrecht et al., Search for b
!
s in exclusive decays of B
mesons, Phys. Lett. B 229 (1989) 304 [INSPIRE].
[24] Heavy Flavor Averaging Group collaboration, D. Asner et al., Averages of b-hadron,
c-hadron and -lepton properties, arXiv:1010.1589, updates available online at
http://www.slac.stanford.edu/xorg/hfag [INSPIRE].
[25] E. Baracchini and G. Isidori, Electromagnetic corrections to non-leptonic two-body B and D
decays, Phys. Lett. B 633 (2006) 309 [hep-ph/0508071] [INSPIRE].
[26] LHCb collaboration, R. Aaij et al., Measurement of b hadron production fractions in 7 TeV
pp collisions, Phys. Rev. D 85 (2012) 032008 [arXiv:1111.2357] [INSPIRE].
[27] H.-n. Li, S. Mishima and A. Sanda, Resolution to the B
!
K puzzle, Phys. Rev. D 72
(2005) 114005 [hep-ph/0508041] [INSPIRE].
[28] C.-D. Lu, Y.-L. Shen and W. Wang, Final state interaction in B
!
KK decays, Phys. Rev.
D 73 (2006) 034005 [hep-ph/0511255] [INSPIRE].
[29] S. Descotes-Genon, J. Matias and J. Virto, Exploring Bd;s
!
KK decays through avour
symmetries and QCD-factorisation, Phys. Rev. Lett. 97 (2006) 061801 [hep-ph/0603239]
[INSPIRE].
[30] H.-Y. Cheng and C.-K. Chua, Revisiting charmless hadronic Bu;d decays in QCD
factorization, Phys. Rev. D 80 (2009) 114008 [arXiv:0909.5229] [INSPIRE].
[31] A.R. Williamson and J. Zupan, Two body B decays with isosinglet nal states in SCET, Phys.
Rev. D 74 (2006) 014003 [Erratum ibid. D 74 (2006) 03901] [hep-ph/0601214] [INSPIRE].
[32] A. Ali, G. Kramer, Y. Li, C.-D. Lu, Y.-L. Shen, et al., Charmless non-leptonic Bs decays to
P P , P V and V V nal states in the pQCD approach, Phys. Rev. D 76 (2007) 074018
[hep-ph/0703162] [INSPIRE].
[33] J. Liu, R. Zhou and Z.-J. Xiao, Bs
!
P P decays and the NLO contributions in the pQCD
Approach, arXiv:0812.2312 [INSPIRE].
[34] H.-Y. Cheng and C.-K. Chua, QCD Factorization for charmless hadronic Bs decays revisited,
Phys. Rev. D 80 (2009) 114026 [arXiv:0910.5237] [INSPIRE].
[35] R. Mohanta, A. Giri and M. Khanna, Charmless two-body hadronic decays of b baryon,
Phys. Rev. D 63 (2001) 074001 [hep-ph/0006109] [INSPIRE].
[36] H. Kaur and M. Khanna, Charmless weak decays of b baryon, Int. J. Mod. Phys. A 21
(2006) 121 [INSPIRE].
[37] C.D. Lu, Y.M. Wang, H. Zou, A. Ali and G. Kramer, Anatomy of the pQCD approach to the
baryonic decays b
!
p ; pK, Phys. Rev. D 80 (2009) 034011 [arXiv:0906.1479] [INSPIRE].
URI: http://wrap.warwick.ac.uk/id/eprint/52251

Request changes or add full text files to a record

Actions (login required)

View Item View Item

Document Downloads

More statistics for this item...