Search for CP violation in the phase space of D0 → π+π−π+π− decays

LHCb Collaboration; R Aaij; Marco Adinolfi; John Benton; 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:10.1016/j.physletb.2017.03.062

Search for CP violation in the phase space of D0 → π+π−π+π− decays

LHCb Collaboration, R Aaij, Marco Adinolfi, John Benton, 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

A search for time-integrated CP violation in the Cabibbo-suppressed decay D0 → π+π−π+π− is
performed using an unbinned, model-independent technique known as the energy test. This is the first
application of the energy test in four-body decays. The search is performed for P-even CP asymmetries
and, for the first time, is extended to probe the P-odd case. Using proton–proton collision data
corresponding to an integrated luminosity of 3.0 fb−1 collected by the LHCb detector at centre-ofmass
energies of √s = 7 TeV and 8 TeV, the world’s best sensitivity to CP violation in this decay is
obtained. The data are found to be consistent with the hypothesis of CP symmetry with a p-value of
(4.6 ± 0.5)% in the P-even case, and marginally consistent with a p-value of (0.6 ± 0.2)% in the P-odd
case, corresponding to a significance for CP non-conservation of 2.7 standard deviations.

Original language	English
Pages (from-to)	345-356
Journal	Physics Letters B
Volume	769
DOIs	https://doi.org/10.1016/j.physletb.2017.03.062
Publication status	Published - 10 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., Benton, J., 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). Search for CP violation in the phase space of D0 → π+π−π+π− decays. Physics Letters B, 769, 345-356. https://doi.org/10.1016/j.physletb.2017.03.062

@article{f9dd18d8fe6145a5a983831d8267a527,

title = "Search for CP violation in the phase space of D0 → π+π−π+π− decays",

abstract = "A search for time-integrated CP violation in the Cabibbo-suppressed decay D0 → π+π−π+π− isperformed using an unbinned, model-independent technique known as the energy test. This is the firstapplication of the energy test in four-body decays. The search is performed for P-even CP asymmetriesand, for the first time, is extended to probe the P-odd case. Using proton–proton collision datacorresponding to an integrated luminosity of 3.0 fb−1 collected by the LHCb detector at centre-ofmassenergies of √s = 7 TeV and 8 TeV, the world{\textquoteright}s best sensitivity to CP violation in this decay isobtained. The data are found to be consistent with the hypothesis of CP symmetry with a p-value of(4.6 ± 0.5)% in the P-even case, and marginally consistent with a p-value of (0.6 ± 0.2)% in the P-oddcase, corresponding to a significance for CP non-conservation of 2.7 standard deviations.",

author = "{LHCb Collaboration} and R Aaij and Marco Adinolfi and John Benton 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 = "10",

doi = "10.1016/j.physletb.2017.03.062",

language = "English",

volume = "769",

pages = "345--356",

journal = "Physics Letters B",

issn = "0370-2693",

publisher = "North-Holland Publishing Company",

}

LHCb Collaboration, Aaij, R, Adinolfi, M, Benton, J, 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, 'Search for CP violation in the phase space of D0 → π+π−π+π− decays', Physics Letters B, vol. 769, pp. 345-356. https://doi.org/10.1016/j.physletb.2017.03.062

TY - JOUR

T1 - Search for CP violation in the phase space of D0 → π+π−π+π− decays

AU - LHCb Collaboration

AU - Aaij, R

AU - Adinolfi, Marco

AU - Benton, John

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 - 2017/6/10

Y1 - 2017/6/10

N2 - A search for time-integrated CP violation in the Cabibbo-suppressed decay D0 → π+π−π+π− isperformed using an unbinned, model-independent technique known as the energy test. This is the firstapplication of the energy test in four-body decays. The search is performed for P-even CP asymmetriesand, for the first time, is extended to probe the P-odd case. Using proton–proton collision datacorresponding to an integrated luminosity of 3.0 fb−1 collected by the LHCb detector at centre-ofmassenergies of √s = 7 TeV and 8 TeV, the world’s best sensitivity to CP violation in this decay isobtained. The data are found to be consistent with the hypothesis of CP symmetry with a p-value of(4.6 ± 0.5)% in the P-even case, and marginally consistent with a p-value of (0.6 ± 0.2)% in the P-oddcase, corresponding to a significance for CP non-conservation of 2.7 standard deviations.

AB - A search for time-integrated CP violation in the Cabibbo-suppressed decay D0 → π+π−π+π− isperformed using an unbinned, model-independent technique known as the energy test. This is the firstapplication of the energy test in four-body decays. The search is performed for P-even CP asymmetriesand, for the first time, is extended to probe the P-odd case. Using proton–proton collision datacorresponding to an integrated luminosity of 3.0 fb−1 collected by the LHCb detector at centre-ofmassenergies of √s = 7 TeV and 8 TeV, the world’s best sensitivity to CP violation in this decay isobtained. The data are found to be consistent with the hypothesis of CP symmetry with a p-value of(4.6 ± 0.5)% in the P-even case, and marginally consistent with a p-value of (0.6 ± 0.2)% in the P-oddcase, corresponding to a significance for CP non-conservation of 2.7 standard deviations.

U2 - 10.1016/j.physletb.2017.03.062

DO - 10.1016/j.physletb.2017.03.062

M3 - Article (Academic Journal)

SN - 0370-2693

VL - 769

SP - 345

EP - 356

JO - Physics Letters B

JF - Physics Letters B

ER -

Search for CP violation in the phase space of D0 → π+π−π+π− decays

Abstract

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Bristol Consolidated Grant 2015-9

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