Measurement of CP Asymmetries in Two-Body B[subscript (s)][superscript 0] -Meson Decays to Charged Pions and Kaons
Name
PhysRevD.98.032004.pdf
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Author(s)
Aaij, R.
Adeva, B.
Adinolfi, M.
Ajaltouni, Z.
Akar, S.
Albicocco, P.
Albrecht, J.
Alessio, F.
Alexander, M.
Alfonso Albero, A.
Date Issued
August 2018
Journal
Physical Review D
Publisher
American Physical Society
Citation
Aaij, R., et al. “Measurement of C P Asymmetries in Two-Body B[subscript (s)][superscript 0] -Meson Decays to Charged Pions and Kaons.” Physical Review D, vol. 98, no. 3, Aug. 2018. © 2018 CERN, for the LHCb Collaboration
Version
Final published version
Abstract
The time-dependent C P asymmetries in B[superscript 0] →π[superscript +]π[superscript -] and B[subscript s][superscript 0]→K[superscript +]K[superscript -] decays are measured using a data sample of p p collisions corresponding to an integrated luminosity of 3.0 fb[superscript -1], collected with the LHCb detector at center-of-mass energies of 7 and 8 TeV. The same data sample is used to measure the time-integrated CP asymmetries in B[superscript 0]→K[superscript +]π[superscript -] and B[subscript s][superscript 0]→π[superscript +]K[superscript -] decays. The results are C[subscript π[superscript +]π[superscript -]]=-0.34±0.06±0.01, S[subscript π[superscript +]π[superscript -]]=-0.63±0.05±0.01, C[subscript K[superscript +]K[superscript -]]=0.20±0.06±0.02, S[subscript K[superscript +]K[superscript -]]=0.18±0.06±0.02, A[subscript K[superscript +]K[superscript -]][superscript ΔΓ]=-0.79±0.07±0.10, A[subscript CP][superscript B[superscript 0]]=-0.084±0.004±0.003, and A[subscript CP][superscript B[subscript s][subscript 0]]=0.213±0.015±0.007, where the first uncertainties are statistical and the second systematic. Evidence for CP violation is found in the B[superscript s][superscript 0]→K[superscript +]K[superscript -] decay for the first time.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
http://dx.doi.org/10.1103/PhysRevD.98.032004
