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Measurement of the direct CP asymmetry in b -> s gamma decays

Aubert, B; Barate, R; Boutigny, D; Couderc, F; Gaillard, JM; Hicheur, A; Karyotakis, Y; ... BaBar Collaboration; + view all (2004) Measurement of the direct CP asymmetry in b -> s gamma decays. PHYS REV LETT , 93 (2) , Article 021804. 10.1103/PhysRevB.69.021804. Green open access

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Abstract

We describe a measurement of the direct CP asymmetry between inclusive b-->sgamma and (b) over bar -->(s) over bar gamma decays. This asymmetry is expected to be less than 0.01 in the standard model, but could be enhanced up to about 0.10 by new physics contributions. We use a sample of 89x10(6) B (B) over bar pairs recorded with the BABAR detector at SLAC PEP-II, from which we reconstruct a set of 12 exclusive b-->sgamma final states containing one charged or neutral kaon and one to three pions. We measure an asymmetry of A(CP)(b-->sgamma)=0.025+/-0.050(stat)+/-0.015(syst), corresponding to an allowed range of -0.06<A(CP)(b-->sgamma)<+0.11 at 90% confidence level.

Type: Article
Title: Measurement of the direct CP asymmetry in b -> s gamma decays
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevB.69.021804
Publisher version: http://dx.doi.org/10.1103/PhysRevB.69.021804
Language: English
Additional information: The American Physical Society
Keywords: RARE B-DECAYS
UCL classification: UCL
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
URI: https://discovery.ucl.ac.uk/id/eprint/1303667
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