An improved measurement of direct CP violation parameters in B^+- -> J/psi K^+- and B^+- -> J/psi pi^+- decays

Collaboration, D0 and Bertram, Iain and Borissov, Guennadi and Ross, Anthony and Williams, Mark and Ratoff, Peter and Fox, Harald and Lamont, Iain and Beattie, Michael (2013) An improved measurement of direct CP violation parameters in B^+- -> J/psi K^+- and B^+- -> J/psi pi^+- decays. Physical review letters, 110 (24). ISSN 1079-7114

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Abstract

We present a measurement of the direct CP-violating charge asymmetry in B± mesons decaying to J/ψK± and J/ψπ± where J/ψ decays to μ+μ-, using the full run II data set of 10.4  fb-1 of proton-antiproton collisions collected using the D0 detector at the Fermilab Tevatron Collider. A difference in the yield of B- and B+ mesons in these decays is found by fitting to the difference between their reconstructed invariant mass distributions resulting in asymmetries of AJ/ψK=[0.59±0.37]%, which is the most precise measurement to date, and AJ/ψπ=[-4.2±4.5]%. Both measurements are consistent with standard model predictions.

Item Type:
Journal Article
Journal or Publication Title:
Physical review letters
Additional Information:
© 2013 American Physical Society
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/3100
Subjects:
ID Code:
63397
Deposited By:
Deposited On:
15 Apr 2013 12:39
Refereed?:
Yes
Published?:
Published
Last Modified:
27 Oct 2020 03:53