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Measurement of mixing and CP violation parameters in two-body charm decays

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LHCb Collaboration (Including: Back, J. J., Dossett, D., Gershon, T. J., Harrison, P. F., Kreps, Michal, Latham, Thomas, Pilar, T., Poluektov, Anton, Reid, M. M., Silva Coutinho, R., Whitehead, M. (Mark) and Williams, M. P.). (2012) Measurement of mixing and CP violation parameters in two-body charm decays. Journal of High Energy Physics, Vol.2012 (No.4). p. 129. ISSN 1029-8479

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Official URL: http://dx.doi.org/10.1007/JHEP04(2012)129

Abstract

A study of mixing and indirect CP violation in D 0 mesons through the determination of the parameters y CP and A Γ is presented. The parameter y CP is the deviation from unity of the ratio of effective lifetimes measured in D 0 decays to the CP eigenstate K + K − with respect to decays to the Cabibbo favoured mode K −π+. The result measured using data collected by LHCb in 2010, corresponding to an integrated luminosity of 29 pb−1, is y CP = (5.5 ± 6.3stat ± 4.1syst) × 10−3. The parameter A Γ is the asymmetry of effective lifetimes measured in decays of D 0 and D0 mesons to K + K −. The result is A Γ = (−5.9 ± 5.9stat ± 2.1syst) × 10−3. A data-driven technique is used to correct for lifetime-biasing effects.

Item Type:	Journal Article
Subjects:	Q Science > QC Physics
Divisions:	Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	CP violation (Nuclear physics), Mesons -- Decay, Large Hadron Collider (France and Switzerland)
Journal or Publication Title:	Journal of High Energy Physics
Publisher:	Springer
ISSN:	1029-8479
Date:	27 April 2012
Volume:	Vol.2012
Number:	No.4
Page Range:	p. 129
Identification Number:	10.1007/JHEP04(2012)129
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription 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), Guo jia zi ran ke xue ji jin wei yuan hui (China) [National Natural Science Foundation of China] (NSFC), Centre national de la recherche scientifique (France) (CNRS), Institut national de physique nucléaire et de physique des particules, 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) (FP7/2007-2013), Auvergne (France)
References:	[1] BABAR collaboration, B. Aubert et al., Evidence for D0 ¯D0 mixing, Phys. Rev. Lett. 98 (2007) 211802 [hep-ex/0703020] [INSPIRE]. [2] Belle collaboration, M. Staric et al., Evidence for D0 - 2 mixing, Phys. Rev. Lett. 98 (2007) 211803 [hep-ex/0703036] [INSPIRE]. [3] BELLE collaboration, K. Abe et al., Measurement of D0 − ¯D 0 mixing parameters in D0 → K0 Sπ+π− decays, Phys. Rev. Lett. 99 (2007) 131803 [arXiv:0704.1000] [INSPIRE]. [4] LHCb collaboration, R. Aaij et al., Evidence for CP-violation in time-integrated D0 → h−h+ decay rates, Phys. Rev. Lett. 108 (2012) 111602 [arXiv:1112.0938] [INSPIRE]. [5] Heavy Flavor Averaging Group collaboration, D. Asner et al., Averages of b-hadron, c-hadron and τ -lepton properties, arXiv:1010.1589 [INSPIRE]. [6] S. Bergmann, Y. Grossman, Z. Ligeti, Y. Nir and A.A. Petrov, Lessons from 2 and 2 measurements of D0 − ¯D0 mixing parameters, Phys. Lett. B 486 (2000) 418 [hep-ph/0005181] [INSPIRE]. [7] M. Gersabeck, M. Alexander, S. Borghi, V. Gligorov and C. Parkes, On the interplay of direct and indirect CP-violation in the charm sector, J. Phys. G 39 (2012) 045005 [arXiv:1111.6515] [INSPIRE]. [8] BABAR collaboration, B. Aubert et al., Measurement of D0-¯D0 Mixing using the Ratio of Lifetimes for the Decays D0 —¿ K- pi+ and K+ K-, Phys. Rev. D 80 (2009) 071103 [arXiv:0908.0761] [INSPIRE]. [9] BABAR collaboration, B. Aubert et al., Measurement of D0 - ¯D0 mixing using the ratio of lifetimes for the decays D0 → K−π+, K−K+ and π−π+, Phys. Rev. D 78 (2008) 011105 [arXiv:0712.2249] [INSPIRE]. [10] LHCb collaboration, J. Alves, A. Augusto et al., The LHCb Detector at the LHC, 2008 JINST 3 S08005 [INSPIRE]. [11] R. Bailey, E. Belau, T. Bohringer, M. Bosman, V. Chabaud, et al., Measurement of the lifetime of charged and neutral D mesons with high resolution silicon strip detectors, Z. Phys. C 28 (1985) 357 [INSPIRE]. [12] DELPHI collaboration, W. Adam et al., Lifetimes of charged and neutral B hadrons using event topology, Z. Phys. C 68 (1995) 363 [INSPIRE]. [13] J. Rademacker, Reduction of statistical power per event due to upper lifetime cuts in lifetime measurements, Nucl. Instrum. Meth. A 570 (2007) 525 [hep-ex/0502042] [INSPIRE]. [14] CDF collaboration, T. Aaltonen et al., Measurement of the B− lifetime using a simulation free approach for trigger bias correction, Phys. Rev. D 83 (2011) 032008 [arXiv:1004.4855] [INSPIRE]. [15] V.V. Gligorov, Measurement of the CKM angle gamma and B meson lifetimes at the LHCb detector, Ph.D. Thesis, St. John’s college, Ofxord U.K. (2008) [CERN-THESIS-2008-044] [INSPIRE]. [16] M. Gersabeck, Alignment of the LHCb vertex locator and lifetime measurements of two-body hadronic final states, Ph.D. Thesis, Galsgow University, Glasgow U.K. (2009) [CERN-THESIS-2009-118] [INSPIRE]. [17] LHCb collaboration, R. Aaij et al., Measurement of the effective B0 s → K+K− lifetime, Phys. Lett. B 707 (2012) 349 [arXiv:1111.0521] [INSPIRE]. [18] LHCb collaboration, R. Aaij et al., Measurement of the CP-violating phase φs in the decay B0 s → J/ψφ, Phys. Rev. Lett. 108 (2012) 101803 [arXiv:1112.3183] [INSPIRE]. [19] Particle Data Group collaboration, K. Nakamura et al., Review of particle physics, J. Phys. G 37 (2010) 075021 [INSPIRE].
URI:	http://wrap.warwick.ac.uk/id/eprint/47958