Measurement of the CP Violation Parameter AΓ in D0 → K+K− and D0 → π + π − Decays

LHCb Collaboration; R Aaij; Marco Adinolfi; Emma Buchanan; Andrew Cook; Jeremy Dalseno; Sam Harnew; James Kariuki; Paras Naik; Konstantinos Petridis; Gabriela Pomery; Eugenia Price; Claire Prouve; Renato Quagliani; Jonas Rademacker; Sophie Richards; Daniel Saunders; Nicola Skidmore; Jaap Velthuis

doi:10.1103/PhysRevLett.118.261803

Measurement of the CP Violation Parameter AΓ in D0 → K+K− and D0 → π + π − Decays

LHCb Collaboration, R Aaij, Marco Adinolfi, Emma Buchanan, Andrew Cook, Jeremy Dalseno, Sam Harnew, James Kariuki, Paras Naik, Konstantinos Petridis, Gabriela Pomery, Eugenia Price, Claire Prouve, Renato Quagliani, Jonas Rademacker, Sophie Richards, Daniel Saunders, Nicola Skidmore, Jaap Velthuis

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Abstract

Asymmetries in the time-dependent rates of D0 → KþK− and D0 → πþπ− decays are measured in a pp
collision data sample collected with the LHCb detector during LHC Run 1, corresponding to an integrated
luminosity of 3 fb−1. The asymmetries in effective decay widths between D0 and D0 decays, sensitive to
indirect CP violation, are measured to be AΓðKþK−Þ¼ð−0.30 0.32 0.10Þ × 10−3 and AΓðπþπ−Þ ¼
ð0.46 0.58 0.12Þ × 10−3, where the first uncertainty is statistical and the second systematic. These
measurements show no evidence for CP violation and improve on the precision of the previous best
measurements by nearly a factor of two.
DOI

Original language	English
Article number	261803
Journal	Physical Review Letters
Volume	118
DOIs	https://doi.org/10.1103/PhysRevLett.118.261803
Publication status	Published - 28 Jun 2017

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Bristol Consolidated Grant 2015-9
Goldstein, J. (Principal Investigator)
1/10/15 → 31/03/21
Project: Research

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LHCb Collaboration, Aaij, R., Adinolfi, M., Buchanan, E., Cook, A., Dalseno, J., Harnew, S., Kariuki, J., Naik, P., Petridis, K., Pomery, G., Price, E., Prouve, C., Quagliani, R., Rademacker, J., Richards, S., Saunders, D., Skidmore, N., & Velthuis, J. (2017). Measurement of the CP Violation Parameter AΓ in D0 → K+K− and D0 → π + π − Decays. Physical Review Letters, 118, Article 261803. https://doi.org/10.1103/PhysRevLett.118.261803

@article{bfff523d338944f99492835ecb599305,

title = "Measurement of the CP Violation Parameter AΓ in D0 → K+K− and D0 → π + π − Decays",

abstract = "Asymmetries in the time-dependent rates of D0 → K{\th}K− and D0 → π{\th}π− decays are measured in a ppcollision data sample collected with the LHCb detector during LHC Run 1, corresponding to an integratedluminosity of 3 fb−1. The asymmetries in effective decay widths between D0 and D0 decays, sensitive toindirect CP violation, are measured to be AΓ{\dh}K{\th}K−{\TH}¼{\dh}−0.30 0.32 0.10{\TH} × 10−3 and AΓ{\dh}π{\th}π−{\TH} ¼{\dh}0.46 0.58 0.12{\TH} × 10−3, where the first uncertainty is statistical and the second systematic. Thesemeasurements show no evidence for CP violation and improve on the precision of the previous bestmeasurements by nearly a factor of two.DOI",

author = "{LHCb Collaboration} and R Aaij and Marco Adinolfi and Emma Buchanan and Andrew Cook and Jeremy Dalseno and Sam Harnew and James Kariuki and Paras Naik and Konstantinos Petridis and Gabriela Pomery and Eugenia Price and Claire Prouve and Renato Quagliani and Jonas Rademacker and Sophie Richards and Daniel Saunders and Nicola Skidmore and Jaap Velthuis",

year = "2017",

month = jun,

day = "28",

doi = "10.1103/PhysRevLett.118.261803",

language = "English",

volume = "118",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society (APS)",

}

LHCb Collaboration, Aaij, R, Adinolfi, M, Buchanan, E, Cook, A, Dalseno, J, Harnew, S, Kariuki, J, Naik, P, Petridis, K, Pomery, G, Price, E, Prouve, C, Quagliani, R, Rademacker, J, Richards, S, Saunders, D, Skidmore, N & Velthuis, J 2017, 'Measurement of the CP Violation Parameter AΓ in D0 → K+K− and D0 → π + π − Decays', Physical Review Letters, vol. 118, 261803. https://doi.org/10.1103/PhysRevLett.118.261803

TY - JOUR

T1 - Measurement of the CP Violation Parameter AΓ in D0 → K+K− and D0 → π + π − Decays

AU - LHCb Collaboration

AU - Aaij, R

AU - Adinolfi, Marco

AU - Buchanan, Emma

AU - Cook, Andrew

AU - Dalseno, Jeremy

AU - Harnew, Sam

AU - Kariuki, James

AU - Naik, Paras

AU - Petridis, Konstantinos

AU - Pomery, Gabriela

AU - Price, Eugenia

AU - Prouve, Claire

AU - Quagliani, Renato

AU - Rademacker, Jonas

AU - Richards, Sophie

AU - Saunders, Daniel

AU - Skidmore, Nicola

AU - Velthuis, Jaap

PY - 2017/6/28

Y1 - 2017/6/28

N2 - Asymmetries in the time-dependent rates of D0 → KþK− and D0 → πþπ− decays are measured in a ppcollision data sample collected with the LHCb detector during LHC Run 1, corresponding to an integratedluminosity of 3 fb−1. The asymmetries in effective decay widths between D0 and D0 decays, sensitive toindirect CP violation, are measured to be AΓðKþK−Þ¼ð−0.30 0.32 0.10Þ × 10−3 and AΓðπþπ−Þ ¼ð0.46 0.58 0.12Þ × 10−3, where the first uncertainty is statistical and the second systematic. Thesemeasurements show no evidence for CP violation and improve on the precision of the previous bestmeasurements by nearly a factor of two.DOI

AB - Asymmetries in the time-dependent rates of D0 → KþK− and D0 → πþπ− decays are measured in a ppcollision data sample collected with the LHCb detector during LHC Run 1, corresponding to an integratedluminosity of 3 fb−1. The asymmetries in effective decay widths between D0 and D0 decays, sensitive toindirect CP violation, are measured to be AΓðKþK−Þ¼ð−0.30 0.32 0.10Þ × 10−3 and AΓðπþπ−Þ ¼ð0.46 0.58 0.12Þ × 10−3, where the first uncertainty is statistical and the second systematic. Thesemeasurements show no evidence for CP violation and improve on the precision of the previous bestmeasurements by nearly a factor of two.DOI

U2 - 10.1103/PhysRevLett.118.261803

DO - 10.1103/PhysRevLett.118.261803

M3 - Article (Academic Journal)

C2 - 28707946

SN - 0031-9007

VL - 118

JO - Physical Review Letters

JF - Physical Review Letters

M1 - 261803

ER -

Measurement of the CP Violation Parameter AΓ in D0 → K+K− and D0 → π + π − Decays

Abstract

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Bristol Consolidated Grant 2015-9

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