Measurement of the D+/- production asymmetry in 7 TeV pp collisions

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

doi:10.1016/j.physletb.2012.11.038

Measurement of the D+/- production asymmetry in 7 TeV pp collisions

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

The asymmetry in the production cross-section @s of D^+/- mesons,A_P=@s(D^+)-@s(D^-)@s(D^+)+@s(D^-), is measured in bins of pseudorapidity @h and transverse momentum p_T within the acceptance of the LHCb detector. The result is obtained with a sample of D^+->K_S^0@p^+ decays corresponding to an integrated luminosity of 1.0 fb^-^1, collected in pp collisions at a centre of mass energy of 7 TeV at the Large Hadron Collider. When integrated over the kinematic range 2.0<p_T<18.0 GeV/c and 2.20<@h<4.75, the production asymmetry is A_P=(-0.96+/-0.26+/-0.18)%. The uncertainties quoted are statistical and systematic, respectively. The result assumes that any direct CP violation in the D^+->K_S^0@p^+ decay is negligible. No significant dependence on @h or p_T is observed.

Original language	English
Pages (from-to)	902-909
Number of pages	8
Journal	Physics Letters B
Volume	B718
Early online date	15 Oct 2012
DOIs	https://doi.org/10.1016/j.physletb.2012.11.038
Publication status	Published - 8 Jan 2013

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title = "Measurement of the D+/- production asymmetry in 7 TeV pp collisions",

abstract = "The asymmetry in the production cross-section @s of D^+/- mesons,A_P=@s(D^+)-@s(D^-)@s(D^+)+@s(D^-), is measured in bins of pseudorapidity @h and transverse momentum p_T within the acceptance of the LHCb detector. The result is obtained with a sample of D^+->K_S^0@p^+ decays corresponding to an integrated luminosity of 1.0 fb^-^1, collected in pp collisions at a centre of mass energy of 7 TeV at the Large Hadron Collider. When integrated over the kinematic range 2.0K_S^0@p^+ decay is negligible. No significant dependence on @h or p_T is observed.",

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

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T1 - Measurement of the D+/- production asymmetry in 7 TeV pp collisions

AU - Playfer, Stephen

AU - The LHCb Collaboration

AU - Needham, Matthew

AU - Muheim, Franz

AU - Clarke, Peter

AU - Xie, Yuehong

AU - Eisenhardt, Stephan

PY - 2013/1/8

Y1 - 2013/1/8

N2 - The asymmetry in the production cross-section @s of D^+/- mesons,A_P=@s(D^+)-@s(D^-)@s(D^+)+@s(D^-), is measured in bins of pseudorapidity @h and transverse momentum p_T within the acceptance of the LHCb detector. The result is obtained with a sample of D^+->K_S^0@p^+ decays corresponding to an integrated luminosity of 1.0 fb^-^1, collected in pp collisions at a centre of mass energy of 7 TeV at the Large Hadron Collider. When integrated over the kinematic range 2.0K_S^0@p^+ decay is negligible. No significant dependence on @h or p_T is observed.

AB - The asymmetry in the production cross-section @s of D^+/- mesons,A_P=@s(D^+)-@s(D^-)@s(D^+)+@s(D^-), is measured in bins of pseudorapidity @h and transverse momentum p_T within the acceptance of the LHCb detector. The result is obtained with a sample of D^+->K_S^0@p^+ decays corresponding to an integrated luminosity of 1.0 fb^-^1, collected in pp collisions at a centre of mass energy of 7 TeV at the Large Hadron Collider. When integrated over the kinematic range 2.0K_S^0@p^+ decay is negligible. No significant dependence on @h or p_T is observed.

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DO - 10.1016/j.physletb.2012.11.038

M3 - Article

SN - 0370-2693

VL - B718

SP - 902

EP - 909

JO - Physics Letters B

JF - Physics Letters B

ER -

Measurement of the D+/- production asymmetry in 7 TeV pp collisions

Abstract

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