Measurement of the B→Xsl+l− branching fraction and search for direct CP violation from a sum of exclusive final states

• Verfasst von: Lees, Jean-Pierre [VerfasserIn]
• Verfasst von: Adametz, Aleksandra [VerfasserIn]
• Verfasst von: Uwer, Ulrich [VerfasserIn]
• Titel: Measurement of the B→Xsl+l− branching fraction and search for direct CP violation from a sum of exclusive final states
• Körperschaft: BABAR Collaboration [VerfasserIn]
• Verf.angabe: J.P. Lees, A. Adametz, U. Uwer (BaBar Collaboration) [und viele weitere]
• E-Jahr: 2014
• Jahr: 30 May 2014
• Fussnoten: BaBar Collaboration: J.P. Lees, A. Adametz, U. Uwer [und viele weitere] ; Im Titel ist „s“ tiefgestellt ; Im Titel sind das Plus- und Minuszeichen hochgestellt ; Gesehen am 13.10.2020
• Titel Quelle: Enthalten in: Physical review letters
• Ort Quelle: College Park, Md. : APS, 1958
• Jahr Quelle: 2014
• Band/Heft Quelle: 112(2014,21) Artikel-Nummer 211802, 8 Seiten
• ISSN Quelle: 1079-7114
• DOI: doi:10.1103/PhysRevLett.112.211802
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1735441007

Abstract

We measure the total branching fraction of the flavor-changing neutral-current process B→Xsℓ+ℓ−, along with partial branching fractions in bins of dilepton and hadronic system (Xs) mass, using a sample of 471×106 Υ(4S)→B¯B 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 Xs final states. Extrapolating from a sum over these exclusive modes, we measure a lepton-flavor-averaged inclusive branching fraction B(B→Xsℓ+ℓ−)=[6.73+0.70−0.64(stat)+0.34−0.25(exp syst)±0.50(model syst)]×10−6 for m2ℓ+ℓ−>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 ACP in bins of dilepton mass; over the full dilepton mass range, we find ACP=0.04±0.11±0.01 for a lepton-flavor-averaged sample.