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2005•Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fieldsOpen access

Measurements of the B→Xsγ branching fraction and photon spectrum from a sum of exclusive final states

B. Aubert, R. Barate, D. Boutigny, F. Couderc, Y. Karyotakis, J. P. Lees, Vincent Poireau, V. Tisserand, Amina Zghiche, E. Graugés, A. Palano, M. Pappagallo, A. Pompili, J. C. Chen, N. D. Qi, G. Rong, P. Wang, Y. S. Zhu, G. Eigen, I. Ofte, B. Stugu, G. S. Abrams, M. Battaglia, A. B. Breon, D. N. Brown, Janice Button-Shafer, R. N. Cahn, E. Charles, C. T. Day, M. S. Gill, Andrei V. Gritsan, Y. Groysman, R. G. Jacobsen, R. W. Kadel, John A. Kadyk, L. T. Kerth, Yu. G. Kolomensky, G. Kukartsev, G. Lynch, L. M. Mir, Piermaria J. Oddone, Toyoko J. Orimoto, Morris Pripstein, N. A. Roe, M. T. Ronan, William A. Wenzel, Matthew J. Barrett, K. E. Ford, T. Harrison, A. J. Hart, C. M. Hawkes, S. E. Morgan, A. T. Watson, M. Fritsch, K. Goetzen, T. Held, H. Koch, Bartłomiej Lewandowski, M. Pelizaeus, Κ. Peters, T. Schroeder, M. Steinke, J. Boyd, James P. Burke, N. Chevalier, W. N. Cottingham, Tülay Çuhadar-Dönszelmann, B. G. Fulsom, C. Hearty, N. S. Knecht, T. S. Mattison, J. A. McKenna, Atif J. 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Calcaterra, R. de Sangro, G. Finocchiaro, P. Patteri, I. M. Peruzzi, M. Piccolo, A. Z. Zallo, A. Buzzo, R. Capra, R. Contri, M. Lo Vetere, M. Macri, M. R. Monge, S. Passaggio, Claudia Patrignani, E. Robutti, A. Santroni, S. Tosi, G. W. Brandenburg, K. S. Chaisanguanthum, M.M. Morii, E. Won, J.T. Wu, R. S. Dubitzky, U. Langenegger, J. Marks, Stefan Schenk, U. Uwer, W. Bhimji, D. A. Bowerman, P. D. Dauncey, U. Egede, R. L. Flack, J. R. Gaillard, G. W. Morton, J. Nash, M. B. Nikolich, G. P. Taylor, J. G. Panduro Vazquez, M. Charles, W. F. Mader, U. Mallik, A. K. Mohapatra, J. Cochran, H. B. Crawley, V. Eyges, W. T. Meyer, S. Prell, E. I. Rosenberg, A. E. Rubin, J. Yi, N. Arnaud, M. Davier, X. Giroux, G. Grosdidier, A. Höcker, F. Le Diberder, V. Lepeltier, A. M. Lutz, A. Oyanguren, Troels Christian Petersen, M. Pierini, S. Plaszczynski, S. Rodier, P. Roudeau, M. H. Schune, A. Stocchi, G. Wormser, C. H. Cheng, D. J. Lange, M. C. Simani, Douglas M. Wright, Adrian John Bevan, C. A. 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Dorfan, D. Dujmic, W. Dunwoodie, S. Fan, R. C. Field, T. Glanzman, S. J. Gowdy, T. Hadig, V. Halyo, C. Hast, T. Hryn’ova, W. R. Innes, M. H. Kelsey, P. Kim, M. L. Kocian, D. W. G. S. Leith, James Frederick Libby, S. Luitz, V. Luth, H. L. Lynch, H. Marsiske, R. Messner, D. R. Muller, C. P. O’Grady, V. E. Ozcan, A. Perazzo, M. Perl, B. N. Ratcliff, Aaron J. Roodman, A. A. Salnikov, R. H. Schindler, Jochen Schwiening, Alana Snyder, J. Stelzer, D. Su, M. K. Sullivan, K. Suzuki, S. K. Swain, J. M. Thompson, J. Va’vra, M. Weaver, W. J. Wisniewski, M. Wittgen, D. H. Wright, A. K. Yarritu, K. Yi, C. C. Young, P. R. Burchat, A. J. Edwards, S. Majewski, B. A. Petersen, C. Roat, M. Ahmed, S. Ahmed, M. S. Alam, J. A. Ernst, M. A. Saeed, F. R. Wappler, Samya Bano Zain, W. Bugg, M. Krishnamurthy, S. M. Spanier, R. Eckmann, J. L. Ritchie, A. Satpathy, R. F. Schwitters, J. M. Izen, I. Kitayama, X. C. Lou, S. Ye, F. Bianchi, M. Bóna, F. Gallo, D. Gamba, M. Bomben, L. Bosisio, C. Cartaro, F. Cossutti, G. Della Ricca, S. Dittongo, S. Grancagnolo, L. Lanceri, Lorenzo G. Vitale, F. Martínez-Vidal, R. S. Panvini, Sw. Banerjee, B. Bhuyan, C. M. Brown, D. Fortin, K. Hamano, R. Kowalewski, J. Michael Roney, R. J. Sobie, J. J. Back, P. F. Harrison, T. Latham, G. B. Mohanty, H. R. Band, X. Chen, B. Cheng, S. Dasu, M. Datta, A. M. Eichenbaum, K. T. Flood, M. T. Graham, J. J. Hollar, J. R. Johnson, P. E. Kutter, H. Li, R. Liu, B. Mellado, A. Mihalyi, Y. Pan, R. Prepost, P. Tan, J. H. von Wimmersperg-Toeller, Sau Lan Wu, Z. Yu, H. Neal

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Abstract

Using 88.9 million $B\overline{B}$ events collected by the BABAR detector at the $\mathit{\ensuremath{\Upsilon}}(4S)$, we measure the branching fraction for the radiative penguin process $B\ensuremath{\rightarrow}{X}_{s}\ensuremath{\gamma}$ from the sum of 38 exclusive final states. The inclusive branching fraction above a minimum photon energy ${E}_{\ensuremath{\gamma}}>1.9\text{ }\text{ }\mathrm{GeV}$ is $\mathcal{B}(b\ensuremath{\rightarrow}s\ensuremath{\gamma})=(3.27\ifmmode\pm\else\textpm\fi{}0.18(\mathrm{stat}{)}_{\ensuremath{-}0.40}^{+0.55}(\mathrm{syst}{)}_{\ensuremath{-}0.09}^{+0.04}(\mathrm{theory}))\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$. We also measure the isospin asymmetry between ${B}^{\ensuremath{-}}\ensuremath{\rightarrow}{X}_{s\overline{u}}\ensuremath{\gamma}$ and ${\overline{B}}^{0}\ensuremath{\rightarrow}{X}_{s\overline{d}}\ensuremath{\gamma}$ to be ${\ensuremath{\Delta}}_{0\ensuremath{-}}=\ensuremath{-}0.006\ifmmode\pm\else\textpm\fi{}0.058(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.009(\mathrm{syst})\ifmmode\pm\else\textpm\fi{}0.024({\overline{B}}^{0}/{B}^{\ensuremath{-}})$. The photon energy spectrum is measured in the $B$ rest frame, from which moments are derived for different values of the minimum photon energy. We present fits to the photon spectrum and moments which give the heavy-quark parameters ${m}_{b}$ and ${\ensuremath{\mu}}_{\ensuremath{\pi}}^{2}$. The fitted parameters are consistent with those obtained from semileptonic $B\ensuremath{\rightarrow}{X}_{c}\ensuremath{\ell}\ensuremath{\nu}$ decays, and are useful inputs for the extraction of $|{V}_{ub}|$ from measurements of semileptonic $B\ensuremath{\rightarrow}{X}_{u}\ensuremath{\ell}\ensuremath{\nu}$ decays.

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Using 88.9 million $B\overline{B}$ events collected by the BABAR detector at the $\mathit{\ensuremath{\Upsilon}}(4S)$, we measure the branching fraction for the radiative penguin process $B\ensuremath{\rightarrow}{X}_{s}\ensuremath{\gamma}$ from the sum of 38 exclusive final states. The inclusive branching fraction above a minimum photon energy ${E}_{\ensuremath{\gamma}}>1.9\text{ }\text{ }\mathrm{GeV}$ is $\mathcal{B}(b\ensuremath{\rightarrow}s\ensuremath{\gamma})=(3.27\ifmmode\pm\else\textpm\fi{}0.18(\mathrm{stat}{)}_{\ensuremath{-}0.40}^{+0.55}(\mathrm{syst}{)}_{\ensuremath{-}0.09}^{+0.04}(\mathrm{theory}))\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$. We also measure the isospin asymmetry between ${B}^{\ensuremath{-}}\ensuremath{\rightarrow}{X}_{s\overline{u}}\ensuremath{\gamma}$ and ${\overline{B}}^{0}\ensuremath{\rightarrow}{X}_{s\overline{d}}\ensuremath{\gamma}$ to be ${\ensuremath{\Delta}}_{0\ensuremath{-}}=\ensuremath{-}0.006\ifmmode\pm\else\textpm\fi{}0.058(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.009(\mathrm{syst})\ifmmode\pm\else\textpm\fi{}0.024({\overline{B}}^{0}/{B}^{\ensuremath{-}})$. The photon energy spectrum is measured in the $B$ rest frame, from which moments are derived for different values of the minimum photon energy. We present fits to the photon spectrum and moments which give the heavy-quark parameters ${m}_{b}$ and ${\ensuremath{\mu}}_{\ensuremath{\pi}}^{2}$. The fitted parameters are consistent with those obtained from semileptonic $B\ensuremath{\rightarrow}{X}_{c}\ensuremath{\ell}\ensuremath{\nu}$ decays, and are useful inputs for the extraction of $|{V}_{ub}|$ from measurements of semileptonic $B\ensuremath{\rightarrow}{X}_{u}\ensuremath{\ell}\ensuremath{\nu}$ decays.

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Available abstract

Using 88.9 million $B\overline{B}$ events collected by the BABAR detector at the $\mathit{\ensuremath{\Upsilon}}(4S)$, we measure the branching fraction for the radiative penguin process $B\ensuremath{\rightarrow}{X}_{s}\ensuremath{\gamma}$ from the sum of 38 exclusive final states. The inclusive branching fraction above a minimum photon energy ${E}_{\ensuremath{\gamma}}>1.9\text{ }\text{ }\mathrm{GeV}$ is $\mathcal{B}(b\ensuremath{\rightarrow}s\ensuremath{\gamma})=(3.27\ifmmode\pm\else\textpm\fi{}0.18(\mathrm{stat}{)}_{\ensuremath{-}0.40}^{+0.55}(\mathrm{syst}{)}_{\ensuremath{-}0.09}^{+0.04}(\mathrm{theory}))\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$. We also measure the isospin asymmetry between ${B}^{\ensuremath{-}}\ensuremath{\rightarrow}{X}_{s\overline{u}}\ensuremath{\gamma}$ and ${\overline{B}}^{0}\ensuremath{\rightarrow}{X}_{s\overline{d}}\ensuremath{\gamma}$ to be ${\ensuremath{\Delta}}_{0\ensuremath{-}}=\ensuremath{-}0.006\ifmmode\pm\else\textpm\fi{}0.058(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.009(\mathrm{syst})\ifmmode\pm\else\textpm\fi{}0.024({\overline{B}}^{0}/{B}^{\ensuremath{-}})$. The photon energy spectrum is measured in the $B$ rest frame, from which moments are derived for different values of the minimum photon energy. We present fits to the photon spectrum and moments which give the heavy-quark parameters ${m}_{b}$ and ${\ensuremath{\mu}}_{\ensuremath{\pi}}^{2}$. The fitted parameters are consistent with those obtained from semileptonic $B\ensuremath{\rightarrow}{X}_{c}\ensuremath{\ell}\ensuremath{\nu}$ decays, and are useful inputs for the extraction of $|{V}_{ub}|$ from measurements of semileptonic $B\ensuremath{\rightarrow}{X}_{u}\ensuremath{\ell}\ensuremath{\nu}$ decays.

Key concepts: Physics, Particle physics, Semileptonic decay, Electron–positron annihilation, Branching fraction, Nuclear physics, Hadron, Lepton

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Measurements of the B→Xsγ branching fraction and photon spectrum from a sum of exclusive final states — Research Paper | ScholarLens