Measurements of the B to Xs gamma Branching Fraction and Spectral Shape from a Sum of Exclusive Final States

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Using 88.9 million B{bar B} events collected by the BABAR detector at the {Upsilon}(4S), they measure the branching fraction for the radiative penguin process B {yields} X{sub s}{gamma} from the sum of 38 exclusive final states. The inclusive branching fraction above a minimum photon energy E{sub {gamma}} > 1.9 GeV is {Beta}(b {yields} s{gamma}) = (3.27 {+-} 0.18(stat.){sub -0.40}{sup +0.55}(syst.){sub -0.09}{sup +0.04}(theory)) x 10{sup -4}. They also measure the isospin asymmetry between B{sup -} {yields} X{sub s{bar u}}{gamma} and {bar B}{sup 0} {yields} X{sub sd}{gamma} to be {Delta}{sub 0-} = -0.006 {+-} 0.058(stat.) {+-} 0.009(syst.) {+-} 0.024({bar B}{sup 0}/B{sup -}). ... continued below

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Aubert, B.; Barate, R.; Boutigny, D.; Couderc, F.; Karyotakis, Y.; Lees, J. P. et al. August 26, 2005.

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Using 88.9 million B{bar B} events collected by the BABAR detector at the {Upsilon}(4S), they measure the branching fraction for the radiative penguin process B {yields} X{sub s}{gamma} from the sum of 38 exclusive final states. The inclusive branching fraction above a minimum photon energy E{sub {gamma}} > 1.9 GeV is {Beta}(b {yields} s{gamma}) = (3.27 {+-} 0.18(stat.){sub -0.40}{sup +0.55}(syst.){sub -0.09}{sup +0.04}(theory)) x 10{sup -4}. They also measure the isospin asymmetry between B{sup -} {yields} X{sub s{bar u}}{gamma} and {bar B}{sup 0} {yields} X{sub sd}{gamma} to be {Delta}{sub 0-} = -0.006 {+-} 0.058(stat.) {+-} 0.009(syst.) {+-} 0.024({bar B}{sup 0}/B{sup -}). The photon energy spectrum is measured in the B rest frame, from which moments are derived for different values of the minimum photon energy. They present fits to the photon spectrum and moments which give the heavy-quark parameters m{sub b} and {mu}{sub {pi}}{sup 2}. The fitted parameters are consistent with those obtained from semileptonic B {yields} X{sub c}{ell}{nu} decays, and are useful inputs for the extraction of |V{sub ub}| from measurements of semileptonic B {yields} X{sub u}{ell}{nu} decays.

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16 pages

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  • Presented at EPS International Europhysics Conference on High Energy Physics (HEP-EPS 2005), Lisbon, Portugal, 21-27 Jul 2005

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  • Report No.: SLAC-PUB-11365
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 878732
  • Archival Resource Key: ark:/67531/metadc874645

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  • August 26, 2005

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  • Sept. 21, 2016, 2:29 a.m.

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  • July 25, 2017, 10:05 a.m.

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Aubert, B.; Barate, R.; Boutigny, D.; Couderc, F.; Karyotakis, Y.; Lees, J. P. et al. Measurements of the B to Xs gamma Branching Fraction and Spectral Shape from a Sum of Exclusive Final States, article, August 26, 2005; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc874645/: accessed July 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.