Measurement of the charge asymmetry in semileptonic B-s(0) decays.

Ratoff, Peter N. and Bertram, I. and Borissov, Guennadi and Fox, H. (2007) Measurement of the charge asymmetry in semileptonic B-s(0) decays. Physical review letters, 98 (15). p. 151801.

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We have performed the first direct measurement of the time-integrated flavor untagged charge asymmetry in semileptonic B decays A by comparing the decay rate of Bµ+DX, where D- and K+K-, with the charge-conjugate decay rate. This sample was selected from 1.3 fb-1 of data collected by the D0 experiment in run II of the Fermilab Tevatron collider. We obtain A=[1.23±0.97(stat)±0.17(syst)]×10-2. Assuming that ms/s1, this result can be translated into a measurement of the CP-violating phase in B mixing: s/mstans= [2.45±1.93(stat)±0.35(syst)]×10-2.

Item Type:
Journal Article
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Physical review letters
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Ratoff led the Lancaster group which carried out the complete data analysis and wrote the paper. This is the first direct constraint on the CP violating phase in the B-s system and has had a significant impact on the field, stimulating substantial theoretical developments, as evidenced by 18 citations (SPIRES). RAE_import_type : Journal article RAE_uoa_type : Physics
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02 Apr 2008 15:09
Last Modified:
21 Nov 2022 19:10