Measurement of the Direct CP-violating Charge Asymmetry in D±s→ϕπ± Decays

Abazov, V.M. and Abbott, B. and Acharya, B.S. and Adams, T. and Agnew, J.P. and Alexeev, G.D. and Alkhazov, G. and Alton, A. and Askew, A. and Atkins, S. and Augsten, K. and Avila, C. and Badaud, F. and Bagby, L. and Baldin, B. and Bandurin, D.V. and Barberis, E. and Baringer, P. and Bartlett, J.F. and Bassler, U. and Bazterra, V. and Begalli, M. and Bellantoni, L. and Bernardi, G. and Bernhard, R. and Bertram, I. and Besanifmmode çelse çon, M. and Beuselinck, R. and Bhat, P.C. and Bhatia, S. and Bhatnagar, V. and Blazey, G. and Blessing, S. and Bloom, K. and Boehnlein, A. and Boline, D. and Boos, E.E. and Borissov, G. and Brandt, A. and Brandt, O. and Brock, R. and Bross, A. and Bu, X.B. and Buehler, M. and Buescher, V. and Fox, H. and Price, D. and Ratoff, P.N. and Ross, A. and Williams, M.R.J. (2014) Measurement of the Direct CP-violating Charge Asymmetry in D±s→ϕπ± Decays. Physical review letters, 112. ISSN 1079-7114

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We present a measurement of the direct CP-violating charge asymmetry in D+s→ϕπ± decays where the ϕ meson decays to K+K−, using the full Run II data set with an integrated luminosity of 10.4  fb−1 of proton-antiproton collisions collected using the D0 detector at the Fermilab Tevatron Collider. The normalized difference ACP in the yield of D+s and D−s mesons in these decays is measured by fitting the difference between their reconstructed invariant mass distributions. This results in an asymmetry of ACP=[−0.38±0.27]%, which is the most precise measurement of this quantity to date. The result is consistent with the standard model prediction of zero CP asymmetry in this decay.

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Journal Article
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Physical review letters
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21 Mar 2014 14:54
Last Modified:
09 Jul 2020 03:21