Rights statement: © 2013 American Physical Society
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Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - An improved measurement of direct CP violation parameters in B^+- -> J/psi K^+- and B^+- -> J/psi pi^+- decays
AU - Collaboration, D0
AU - Bertram, Iain
AU - Borissov, Guennadi
AU - Ross, Anthony
AU - Williams, Mark
AU - Ratoff, Peter
AU - Fox, Harald
AU - Lamont, Iain
AU - Beattie, Michael
N1 - © 2013 American Physical Society
PY - 2013/6/12
Y1 - 2013/6/12
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=84879097694&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.110.241801
DO - 10.1103/PhysRevLett.110.241801
M3 - Journal article
VL - 110
JO - Physical review letters
JF - Physical review letters
SN - 1079-7114
IS - 24
M1 - 241801
ER -