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Title: Measurement of CP violation in B-0 -> D+D- decays
Author: Graciani Díaz, Ricardo
Graugés Pous, Eugeni
Rives Molina, Vicente José
Picatoste Olloqui, Eduardo
Vilasis-Cardona, Xavier
LHCb Collaboration
Keywords: Gran Col·lisionador d'Hadrons
Mesons (Física nuclear)
Violació CP (Física nuclear)
Large Hadron Collider (France and Switzerland)
Mesons (Nuclear physics)
CP violation (Nuclear physics)
Issue Date: 23-Dec-2016
Publisher: American Physical Society
Abstract: The CP violation observables S and C in the decay channel B-0 -> D+D- are determined from a sample of proton-proton collisions at center-of-mass energies of 7 and 8 TeV, collected by the LHCb experiment and corresponding to an integrated luminosity of 3 fb(-1). The observable S describes CP violation in the interference between mixing and the decay amplitude, and C parametrizes direct CP violation in the decay. The following values are obtained from a flavor-tagged, decay-time-dependent analysis: S = -0.54(-0.16)(+0.17) (stat) +/- 0.05(syst) ,C=0.26(-0.17)(+0.18) (stat) +/- 0.02(syst). These values provide evidence for CP violation at a significance level of 4.0 standard deviations. The phase shift due to higher-order standard model corrections is constrained to a small value of Delta phi = -0.16(-0.21)(+0.19) rad.
Note: Reproducció del document publicat a:
It is part of: Physical Review Letters, 2016, vol. 117, num. 26, p. 261801
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ISSN: 0031-9007
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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