Measurements of Direct CP-Violating Asymmetries in Charmless Decays of Bottom Baryons
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PhysRevLett.113.242001.pdf
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Author(s)
Aaltonen, T.
Amerio, S.
Amidei, D.
Anastassov, A.
Annovi, A.
Antos, J.
Apollinari, G.
Appel, J. A.
Arisawa, T.
Artikov, A.
Date Issued
December 2014
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Aaltonen, T., et al. "Measurements of Direct CP-Violating Asymmetries in Charmless Decays of Bottom Baryons." Phys. Rev. Lett. 113, 242001 (December 2014). © 2014 American Physical Society
Version
Final published version
Abstract
We report final measurements of direct CP-violating asymmetries in charmless decays of neutral bottom hadrons to pairs of charged hadrons with the upgraded Collider Detector at the Fermilab Tevatron. Using the complete √s = 1.96 TeV proton-antiproton collisions data set, corresponding to 9.3 fb[superscript -1] of integrated luminosity, we measure A(Λ[0 over b] → pπ[superscript -]) = +0.06 ± 0.07(stat) ± 0.03(syst) and A(Λ[0 over b] → pK[superscript -]) = -0.10 ± 0.08(stat) ± 0.04(syst), compatible with no asymmetry. In addition we measure the CP-violating asymmetries in B[0 over s] → K[superscript -]π[superscript +] and B[superscript 0] → K[superscript +]π[superscript -] decays to be A(B[0 over s] → K[superscript -]π[superscript +]) = +0.22 ± 0.07(stat) ± 0.02(syst) and A(B[superscript 0] → K[superscript +]π[superscript -]) = -0.083 ± 0.013(stat) ± 0.004(syst), respectively, which are significantly different from zero and consistent with current world averages.
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
https://doi.org/10.1103/PhysRevLett.113.242001
