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

DSpace/Manakin Repository

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

Show full item record

Title: Measurement of the B → X₋s ℓ⁺ℓ⁻ Branching Fraction and Search for Direct CP Violation from a Sum of Exclusive Final States
Author(s):
Lees, J. P.;
Poireau, V.;
Tisserand, V.;
Grauges, E.;
Palano, A.;
Eigen, G.;
Stugu, B.;
Izen, Joseph M.;
Lou, Xinchou;
BaBar Collaboration
Date Created: 2014-05-30
Format: Text
Item Type: Article
Keywords: Show Keywords
Description: Supplemental materials available at: http://goo.gl/gyli42
Abstract: We measure the total branching fraction of the flavor-changing neutral-current process B→X_s ℓ⁺ℓ⁻, along with partial branching fractions in bins of dilepton and hadronic system (X_s) mass, using a sample of 471 x 10⁶ ϒ(4S) → BB̅ 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_s ℓ⁺ℓ⁻) = [6.73_{-0.64}^{+0.70}(stat)_{-0.25}^{+0.34}(exp syst) ± 0.50(model syst)] x 10⁻⁶ for m_{ℓ⁺ℓ⁻}^2 > 0.1 GeV²/c⁴. 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.
Publisher: American Physical Society
ISSN: 0031-9007
Source: Physical Review Letters
Link to Related Resource: http://dx.doi.org/10.1103/PhysRevLett.112.211802
Persistent Link: http://hdl.handle.net/10735.1/4162
Bibliographic Citation: Lees, J. P., V. Poireau, V. Tisserand, E. Grauges, et al. 2014. "Measurement of the B → X_s ℓ⁺ℓ⁻ branching fraction and search for direct CP violation from a sum of exclusive final states." Physical Review Letters 112(21), doi: 10.1103/PhysRevLett.112.211802
Terms of Use: ©2014 American Physical Society

Files in this item

Files Size Format View
NSM-FR-XLou-271278.59.pdf 202.7Kb PDF View/Open Article

This item appears in the following Collection(s)


Show full item record