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2016-12-23

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cc-by (c) CERN, 2016
Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/114425

Measurement of CP violation in B-0 -> D+D- decays

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https://doi.org/10.1103/PhysRevLett.117.261801

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.

Subject

Gran Col·lisionador d'Hadrons, Mesons (Física nuclear), Violació CP (Física nuclear)

Subject (English)

Large Hadron Collider (France and Switzerland), Mesons (Nuclear physics), CP violation (Nuclear physics)

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Articles publicats en revistes (Física Quàntica i Astrofísica)
Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB))
Publicacions de projectes de recerca finançats per la UE

Citation

GRACIANI DÍAZ, Ricardo, et al. Measurement of CP violation in B-0 -> D+D- decays. Physical Review Letters. 2016. Vol. 117, num. 26, pags. 261801. ISSN 0031-9007. [consulted: 12 of June of 2026]. Available at: https://hdl.handle.net/2445/114425

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