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Published May 30, 2014 | Supplemental Material + Published + Submitted
Journal Article Open

Measurement of the B → X_sℓ^+ℓ^− Branching Fraction and Search for Direct CP Violation from a Sum of Exclusive Final States

Abstract

We measure the total branching fraction of the flavor-changing neutral-current process B→X_sℓ^+ℓ^−, along with partial branching fractions in bins of dilepton and hadronic system (Xs) mass, using a sample of 471×10^6 Υ(4S)→BB events recorded with the BABAR detector. The admixture of charged and neutral B mesons produced at PEP-II2 are reconstructed by combining a dilepton pair with 10 different X_s final states. Extrapolating from a sum over these exclusive modes, we measure a lepton-flavor-averaged inclusive branching fraction B(B→X_sℓ^+ℓ^−)=[6.73^(+0.70)_(−0.64)(stat)^(+0.34)_(−0.25)(exp syst)±0.50(model syst)]×10^(−6) for m^2_(ℓ^+ℓ^−)>0.1  GeV^2/c^4. Restricting our analysis exclusively to final states from which a decaying B meson's flavor can be inferred, we additionally report measurements of the direct CP asymmetry A_(CP) in bins of dilepton mass; over the full dilepton mass range, we find A_(CP)=0.04±0.11±0.01 for a lepton-flavor-averaged sample.

Additional Information

© 2014 American Physical Society. Received 23 December 2013; revised manuscript received 21 April 2014; published 30 May 2014. We are grateful to Enrico Lunghi, Tobias Hurth, and Tobias Huber for useful discussions, as well as providing dilepton mass-squared theory distributions derived using the most up-to-date corrections. We are additionally grateful for the excellent luminosity and machine conditions provided by our PEP-II2 colleagues, and for the substantial dedicated effort from the computing organizations that support BABAR. The collaborating institutions wish to thank SLAC for its support and kind hospitality. This work is supported by DOE and NSF (U.S.), NSERC (Canada), CEA and CNRS-IN2P3 (France), BMBF and DFG (Germany), INFN (Italy), FOM (Netherlands), NFR (Norway), MES (Russia), MINECO (Spain), and STFC (United Kingdom). Individuals have received support from the Marie Curie EIF (European Union) and the A. P. Sloan Foundation (U.S.).

Attached Files

Published - PhysRevLett.112.211802.pdf

Submitted - 1312.5364v2.pdf

Supplemental Material - acpresults.pdf

Supplemental Material - epaps_final.pdf

Supplemental Material - fig01-3.pdf

Supplemental Material - fig02.pdf

Supplemental Material - fig03.pdf

Supplemental Material - fig04.pdf

Supplemental Material - fig05.pdf

Supplemental Material - fig06.pdf

Supplemental Material - fig07.pdf

Supplemental Material - fig08.pdf

Supplemental Material - fig09.pdf

Supplemental Material - fig10.pdf

Supplemental Material - fig11.pdf

Supplemental Material - fig12.pdf

Supplemental Material - fig13.pdf

Supplemental Material - fig14.pdf

Supplemental Material - fig15.pdf

Supplemental Material - fig16.pdf

Supplemental Material - fig17.pdf

Supplemental Material - fig18.pdf

Supplemental Material - fig19.pdf

Supplemental Material - fig20.pdf

Supplemental Material - fig21.pdf

Supplemental Material - fig22.pdf

Supplemental Material - results-mx.pdf

Supplemental Material - rgb.sty

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Additional details

Created:
August 20, 2023
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