Search for direct CP violation in D0→h−h+ modes using semileptonic B decays

The LHCb Collaboration; Matthew Needham; Franz Muheim; Peter Clarke; Yuehong Xie; Stephan Eisenhardt

doi:10.1016/j.physletb.2013.04.061

Search for direct CP violation in D0→h−h+ modes using semileptonic B decays

The LHCb Collaboration, Matthew Needham, Franz Muheim, Peter Clarke, Yuehong Xie, Stephan Eisenhardt

School of Physics and Astronomy

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

Abstract

A search for direct CP violation in D0→h−h+ (where h=K or π) is presented using data corresponding to an integrated luminosity of 1.0 fb−1 collected in 2011 by LHCb in pp collisions at a centre-of-mass energy of 7 TeV. The analysis uses D0 mesons produced in inclusive semileptonic b-hadron decays to the D0μX final state, where the charge of the accompanying muon is used to tag the flavour of the D0 meson. The difference in the CP-violating asymmetries between the two decay channels is measured to be
ΔACP=ACP(K−K+)−ACP(π−π+)=(0.49±0.30(stat)±0.14(syst))% .
This result does not confirm the evidence for direct CP violation in the charm sector reported in other analyses.

Original language	English
Pages (from-to)	33-43
Number of pages	11
Journal	Physics Letters B
Volume	B723
Early online date	11 Mar 2013
DOIs	https://doi.org/10.1016/j.physletb.2013.04.061
Publication status	Published - 10 Jun 2013

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title = "Search for direct CP violation in D0→h−h+ modes using semileptonic B decays",

abstract = "A search for direct CP violation in D0→h−h+ (where h=K or π) is presented using data corresponding to an integrated luminosity of 1.0 fb−1 collected in 2011 by LHCb in pp collisions at a centre-of-mass energy of 7 TeV. The analysis uses D0 mesons produced in inclusive semileptonic b-hadron decays to the D0μX final state, where the charge of the accompanying muon is used to tag the flavour of the D0 meson. The difference in the CP-violating asymmetries between the two decay channels is measured to be ΔACP=ACP(K−K+)−ACP(π−π+)=(0.49±0.30(stat)±0.14(syst))\% . This result does not confirm the evidence for direct CP violation in the charm sector reported in other analyses. ",

author = "Stephen Playfer and \{The LHCb Collaboration\} and Matthew Needham and Franz Muheim and Peter Clarke and Yuehong Xie and Stephan Eisenhardt",

year = "2013",

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doi = "10.1016/j.physletb.2013.04.061",

language = "English",

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journal = "Physics Letters B",

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T1 - Search for direct CP violation in D0→h−h+ modes using semileptonic B decays

AU - Playfer, Stephen

AU - The LHCb Collaboration

AU - Needham, Matthew

AU - Muheim, Franz

AU - Clarke, Peter

AU - Xie, Yuehong

AU - Eisenhardt, Stephan

PY - 2013/6/10

Y1 - 2013/6/10

N2 - A search for direct CP violation in D0→h−h+ (where h=K or π) is presented using data corresponding to an integrated luminosity of 1.0 fb−1 collected in 2011 by LHCb in pp collisions at a centre-of-mass energy of 7 TeV. The analysis uses D0 mesons produced in inclusive semileptonic b-hadron decays to the D0μX final state, where the charge of the accompanying muon is used to tag the flavour of the D0 meson. The difference in the CP-violating asymmetries between the two decay channels is measured to be ΔACP=ACP(K−K+)−ACP(π−π+)=(0.49±0.30(stat)±0.14(syst))% . This result does not confirm the evidence for direct CP violation in the charm sector reported in other analyses.

AB - A search for direct CP violation in D0→h−h+ (where h=K or π) is presented using data corresponding to an integrated luminosity of 1.0 fb−1 collected in 2011 by LHCb in pp collisions at a centre-of-mass energy of 7 TeV. The analysis uses D0 mesons produced in inclusive semileptonic b-hadron decays to the D0μX final state, where the charge of the accompanying muon is used to tag the flavour of the D0 meson. The difference in the CP-violating asymmetries between the two decay channels is measured to be ΔACP=ACP(K−K+)−ACP(π−π+)=(0.49±0.30(stat)±0.14(syst))% . This result does not confirm the evidence for direct CP violation in the charm sector reported in other analyses.

U2 - 10.1016/j.physletb.2013.04.061

DO - 10.1016/j.physletb.2013.04.061

M3 - Article

SN - 0370-2693

VL - B723

SP - 33

EP - 43

JO - Physics Letters B

JF - Physics Letters B

ER -

Search for direct CP violation in D0→h−h+ modes using semileptonic B decays

Abstract

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