Measurement of B (B→Xsγ), the B→Xsγ photon energy spectrum, and the direct CP asymmetry in B→Xs+dγ decays
The photon spectrum in B→Xsγ decay, where Xs is any strange hadronic state, is studied using a data sample of (382.8±4.2)×106 e+e−→Υ(4S)→B¯¯¯B events collected by the BABAR experiment at the PEP-II collider. The spectrum is used to measure the branching fraction B(B→Xsγ)=(3.21±0.15±0.29±0.08)×10−4 a...
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| Main Authors: | , , |
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| Corporate Author: | |
| Format: | Article (Journal) |
| Language: | English |
| Published: |
28 December 2012
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| In: |
Physical review. D, Particles, fields, gravitation, and cosmology
Year: 2012, Volume: 86, Issue: 11 |
| ISSN: | 1550-2368 |
| DOI: | 10.1103/PhysRevD.86.112008 |
| Online Access: | Verlag, Volltext: http://dx.doi.org/10.1103/PhysRevD.86.112008 Verlag, Volltext: https://journals.aps.org/prd/abstract/10.1103/PhysRevD.86.112008 
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| Author Notes: | J.P. Lees, A. Adametz, U. Uwer [und weitere] (BABAR Collaboration) |
| Summary: | The photon spectrum in B→Xsγ decay, where Xs is any strange hadronic state, is studied using a data sample of (382.8±4.2)×106 e+e−→Υ(4S)→B¯¯¯B events collected by the BABAR experiment at the PEP-II collider. The spectrum is used to measure the branching fraction B(B→Xsγ)=(3.21±0.15±0.29±0.08)×10−4 and the first, second, and third moments ⟨Eγ⟩=2.267±0.019±0.032±0.003 GeV, ⟨(Eγ−⟨Eγ⟩)2⟩=0.0484±0.0053±0.0077±0.0005 GeV2, and ⟨(Eγ−⟨Eγ⟩)3⟩=−0.0048±0.0011±0.0011±0.0004 GeV3, for the range Eγ>1.8 GeV, where Eγ is the photon energy in the B-meson rest frame. Results are also presented for narrower Eγ ranges. In addition, the direct CP asymmetry ACP(B→Xs+dγ) is measured to be 0.057±0.063. The spectrum itself is also unfolded to the B-meson rest frame; that is the frame in which theoretical predictions for its shape are made. |
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| Item Description: | Im Titel sind das s und γ und die Formel s+dγ tiefgestellt Im Titel ist das B vor der Klammer in anderer Schriftart dargestellt Gesehen am 25.05.2018 |
| Physical Description: | Online Resource |
| ISSN: | 1550-2368 |
| DOI: | 10.1103/PhysRevD.86.112008 |