The CP-violating charge asymmetry in B± → φK± decays is measured in a sample of pp collisions at 7 TeV centre-of-mass energy, corresponding to an integrated luminosity of 1.0 fb-1 collected by the LHCb experiment. The result is ACP( B± → φK±) = 0.022 ± 0.021 ± 0.009, where the first uncertainty is statistical ; the second systematic. In addition, a search for the B± → φπ± decay mode is performed, using the B± → φK± decay rate for normalization. An upper limit on the branching fraction β(B± → φπ± < 1.5 × 10-7 is set at 90% confidence level. © 2013 The Authors.

Measurement of the charge asymmetry in B±→φK± ; search for B±→φπ± decays

PALANO, Antimo;PAPPAGALLO, MARCO IGNAZIO;
2014

Abstract

The CP-violating charge asymmetry in B± → φK± decays is measured in a sample of pp collisions at 7 TeV centre-of-mass energy, corresponding to an integrated luminosity of 1.0 fb-1 collected by the LHCb experiment. The result is ACP( B± → φK±) = 0.022 ± 0.021 ± 0.009, where the first uncertainty is statistical ; the second systematic. In addition, a search for the B± → φπ± decay mode is performed, using the B± → φK± decay rate for normalization. An upper limit on the branching fraction β(B± → φπ± < 1.5 × 10-7 is set at 90% confidence level. © 2013 The Authors.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11586/179727
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