Measurement of CP asymmetry in D-0 -> K- K+ and D-0 -> pi(-) pi(+) decays

Peter Clarke; Greig Cowan; Stephan Eisenhardt; Franz Muheim; Matthew Needham; Stephen Playfer; LHCb Collaboration

doi:10.1007/JHEP07(2014)041

Measurement of CP asymmetry in D-0 -> K- K+ and D-0 -> pi(-) pi(+) decays

Peter Clarke, Greig Cowan, Stephan Eisenhardt, Franz Muheim, Matthew Needham, Stephen Playfer, LHCb Collaboration

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

Abstract

Time-integrated CP asymmetries in D-0 decays to the final states K- K+ and pi(-) pi(+) are measured using proton-proton collisions corresponding to 3 fb(-1) of integrated luminosity collected at centre-of-mass energies of 7 TeV and 8 TeV. The D-0 mesons are produced in semileptonic b-hadron decays, where the charge of the accompanying muon is used to determine the initial flavour of the charm meson. The difference in CP asymmetries between the two final states is measured to be

Delta A(CP) = A(CP)(K- K+) - A(CP)(pi(-) pi(+)) = (+0.14 +/- 0.16 (stat) +/- 0.08 (syst))% .

A measurement of A(CP)(K- K+) is obtained assuming negligible CP violation in charm mixing and in Cabibbo-favoured D decays. It is found to be

A(CP)(K- K+) = (-0.06 +/- 0.15 (stat) +/- 0.10 (syst))% ,

where the correlation coefficient between Delta A(CP) and A(CP)(K- K+) is rho = 0.28. By combining these results, the CP asymmetry in the D-0 -> pi(-) pi(+) channel is A(CP)(pi(-) pi(+)) = (-0.20 +/- 0.19 (stat) +/- 0.10 (syst))%.

Original language	English
Article number	041
Pages (from-to)	041
Number of pages	25
Journal	Journal of High Energy Physics
Volume	1407
Issue number	7
DOIs	https://doi.org/10.1007/JHEP07(2014)041
Publication status	Published - 9 Jul 2014

Keywords / Materials (for Non-textual outputs)

CP violation
Charm physics
Flavor physics
Hadron-Hadron Scattering
SCATTERING-AMPLITUDE
REGENERATION
ABSORPTION
SEARCH

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@article{17693b4aca3b452291930ef0579b9963,

title = "Measurement of CP asymmetry in D-0 -> K- K+ and D-0 -> pi(-) pi(+) decays",

abstract = "Time-integrated CP asymmetries in D-0 decays to the final states K- K+ and pi(-) pi(+) are measured using proton-proton collisions corresponding to 3 fb(-1) of integrated luminosity collected at centre-of-mass energies of 7 TeV and 8 TeV. The D-0 mesons are produced in semileptonic b-hadron decays, where the charge of the accompanying muon is used to determine the initial flavour of the charm meson. The difference in CP asymmetries between the two final states is measured to beDelta A(CP) = A(CP)(K- K+) - A(CP)(pi(-) pi(+)) = (+0.14 +/- 0.16 (stat) +/- 0.08 (syst))% .A measurement of A(CP)(K- K+) is obtained assuming negligible CP violation in charm mixing and in Cabibbo-favoured D decays. It is found to beA(CP)(K- K+) = (-0.06 +/- 0.15 (stat) +/- 0.10 (syst))% ,where the correlation coefficient between Delta A(CP) and A(CP)(K- K+) is rho = 0.28. By combining these results, the CP asymmetry in the D-0 -> pi(-) pi(+) channel is A(CP)(pi(-) pi(+)) = (-0.20 +/- 0.19 (stat) +/- 0.10 (syst))%.",

keywords = "CP violation, Charm physics, Flavor physics, Hadron-Hadron Scattering, SCATTERING-AMPLITUDE, REGENERATION, ABSORPTION, SEARCH",

author = "Peter Clarke and Greig Cowan and Stephan Eisenhardt and Franz Muheim and Matthew Needham and Stephen Playfer and LHCb Collaboration",

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T1 - Measurement of CP asymmetry in D-0 -> K- K+ and D-0 -> pi(-) pi(+) decays

AU - Clarke, Peter

AU - Cowan, Greig

AU - Eisenhardt, Stephan

AU - Muheim, Franz

AU - Needham, Matthew

AU - Playfer, Stephen

AU - Collaboration, LHCb

PY - 2014/7/9

Y1 - 2014/7/9

N2 - Time-integrated CP asymmetries in D-0 decays to the final states K- K+ and pi(-) pi(+) are measured using proton-proton collisions corresponding to 3 fb(-1) of integrated luminosity collected at centre-of-mass energies of 7 TeV and 8 TeV. The D-0 mesons are produced in semileptonic b-hadron decays, where the charge of the accompanying muon is used to determine the initial flavour of the charm meson. The difference in CP asymmetries between the two final states is measured to beDelta A(CP) = A(CP)(K- K+) - A(CP)(pi(-) pi(+)) = (+0.14 +/- 0.16 (stat) +/- 0.08 (syst))% .A measurement of A(CP)(K- K+) is obtained assuming negligible CP violation in charm mixing and in Cabibbo-favoured D decays. It is found to beA(CP)(K- K+) = (-0.06 +/- 0.15 (stat) +/- 0.10 (syst))% ,where the correlation coefficient between Delta A(CP) and A(CP)(K- K+) is rho = 0.28. By combining these results, the CP asymmetry in the D-0 -> pi(-) pi(+) channel is A(CP)(pi(-) pi(+)) = (-0.20 +/- 0.19 (stat) +/- 0.10 (syst))%.

AB - Time-integrated CP asymmetries in D-0 decays to the final states K- K+ and pi(-) pi(+) are measured using proton-proton collisions corresponding to 3 fb(-1) of integrated luminosity collected at centre-of-mass energies of 7 TeV and 8 TeV. The D-0 mesons are produced in semileptonic b-hadron decays, where the charge of the accompanying muon is used to determine the initial flavour of the charm meson. The difference in CP asymmetries between the two final states is measured to beDelta A(CP) = A(CP)(K- K+) - A(CP)(pi(-) pi(+)) = (+0.14 +/- 0.16 (stat) +/- 0.08 (syst))% .A measurement of A(CP)(K- K+) is obtained assuming negligible CP violation in charm mixing and in Cabibbo-favoured D decays. It is found to beA(CP)(K- K+) = (-0.06 +/- 0.15 (stat) +/- 0.10 (syst))% ,where the correlation coefficient between Delta A(CP) and A(CP)(K- K+) is rho = 0.28. By combining these results, the CP asymmetry in the D-0 -> pi(-) pi(+) channel is A(CP)(pi(-) pi(+)) = (-0.20 +/- 0.19 (stat) +/- 0.10 (syst))%.

KW - CP violation

KW - Charm physics

KW - Flavor physics

KW - Hadron-Hadron Scattering

KW - SCATTERING-AMPLITUDE

KW - REGENERATION

KW - ABSORPTION

KW - SEARCH

U2 - 10.1007/JHEP07(2014)041

DO - 10.1007/JHEP07(2014)041

M3 - Article

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JO - Journal of High Energy Physics

JF - Journal of High Energy Physics

IS - 7

M1 - 041

ER -

Measurement of CP asymmetry in D-0 -> K- K+ and D-0 -> pi(-) pi(+) decays

Abstract

Keywords / Materials (for Non-textual outputs)

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