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2014
article
Measurement of the B → Xℓ+ℓ- Branching fraction and search for direct CP violation from a sum of exclusive final states
Jp Lees, V Poireau, V Tisserand, E Grauges, A Palano, G Eigen, B Stugu, DN Brown, LT Kerth, YG Kolomensky, MJ Lee, G Lynch, H Koch, T Schroeder, C Hearty, Ts Mattison, JA McKenna, RY So, A Khan, VE Blinov, AR Buzykaev, VP Druzhinin, VB Golubev, EA Kravchenko, AP Onuchin, SI Serednyakov, YI Skovpen, Ep Solodov, KY Todyshev, AN Yushkov, AJ Lankford, M Mandelkern, B Dey, JW Gary, O Long, C Campagnari, M Franco Sevilla, TM Hong, D Kovalskyi, JD Richman, CA West, AM Eisner, WS Lockman, BA Schumm, A Seiden, DS Chao, CH Cheng, B Echenard, KT Flood, DG Hitlin, TS Miyashita, P Ongmongkolkul, FC Porter, R Andreassen, Z Huard, BT Meadows, BG Pushpawela, MD Sokoloff, L Sun, Pc Bloom, WT Ford, A Gaz, U Nauenberg, JG Smith, SR Wagner, R Ayad, WH Toki, B Spaan, R Schwierz, D Bernard, M Verderi, S Playfer, D Bettoni, C Bozzi, R Calabrese, G Cibinetto, E Fioravanti, I Garzia, E Luppi, L Piemontese, V Santoro, A Calcaterra, R De Sangro, G Finocchiaro, S Martellotti, P Patteri, Im Peruzzi, M Piccolo, M Rama, A Zallo, R Contri, E Guido, M Lo Vetere, MR Monge, S Passaggio, C Patrignani, E Robutti, B Bhuyan, V Prasad
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Le résumé fourni par la source
We measure the total branching fraction of the flavor-changing neutral-current process B→Xℓ+ℓ-, along with partial branching fractions in bins of dilepton and hadronic system (Xs) mass, using a sample of 471×106 (4S)→BB̄ 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→Xℓ+ℓ-)=[6.73-0.64+0.70(stat)-0. 25+0.34(exp syst)±0.50(model syst)]×10-6 for mℓ+ℓ-2>0. 1GeV2/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. © 2014 American Physical Society.
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Particle physics theoretical and experimental studiesQuantum Chromodynamics and Particle InteractionsComputational Physics and Python Applications