Measurement of ℬ(B → Χ_sγ), the B → Χ_sγ Photon Energy Spectrum, and the Direct CP Asymmetry in B → Χ_{s+d}γ Decays.

DSpace/Manakin Repository

Measurement of ℬ(B → Χ_sγ), the B → Χ_sγ Photon Energy Spectrum, and the Direct CP Asymmetry in B → Χ_{s+d}γ Decays.

Show full item record

Title: Measurement of ℬ(B → Χ_sγ), the B → Χ_sγ Photon Energy Spectrum, and the Direct CP Asymmetry in B → Χ_{s+d}γ Decays.
Author(s):
Lees, J. P.;
Poireau, V.;
Tisserand, V.;
Garra Tico, J.;
Grauges, E.;
Palano, A.;
Eigen, G.;
Izen, Joseph M.;
Lou, Xinchou;
BaBar Collaboration
Date Created: 2012-12-28
Format: Text
Item Type: Article
Keywords: Standard model (Nuclear physics)
Quantum chromodynamics
Supersymmetry
Abstract: The photon spectrum in B → X{s}γ decay, where X{s} is any strange hadronic state, is studied using a data sample of (382.8 ± 4.2) x 10⁶ e⁺e⁻ → Υ(4S) → BB̅ events collected by the BABAR experiment at the PEP-II collider. The spectrum is used to measure the branching fraction ℬ(B → X{s}γ) = (3. 21 ± 0.15 ± 0.29 ± 0.08) x 10⁻⁴ and the first, second, and third moments E{γ} = 2.267 ± 0. 019 ± 0.032 ± 0.003 GeV, <(E{γ}) -- <E{γ}}>)² = 0.0484 ± 0.0053 ± 0.0077 ± 0.0005 GeV², and <(E{γ}) -- <E{γ}}>)³ = -0.0048 ± 0.0011 ± 0.0011± 0.0004 GeV3, for the range E{γ} > 1.8 GeV, where E{γ} is the photon energy in the B-meson rest frame. Results are also presented for narrower E{γ} ranges. In addition, the direct CP asymmetry A{CP}(B → X{s+d}γ) 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.
Publisher: American Physical Society
ISSN: 1550-7998
Source: Physical Review D - Particles, Fields, Gravitation and Cosmology
Link to Related Resource: http://dx.doi.org/10.1103/PhysRevD.86.112008
Persistent Link: http://hdl.handle.net/10735.1/3172
Bibliographic Citation: Lees, J. P., V. Poireau, V. Tisserand, et al., 2012. "Measurement of ℬ(B → Χ_sγ), the B → Χ_sγ photon energy spectrum, and the direct CP asymmetry in B → Χ_{s+d}γ decays." Physical Review D 86(11), doi:10.1103/PhysRevD.86.112008
Terms of Use: ©2012 American Physical Society

Files in this item

Files Size Format View
NSM-FR-XCLou-310563.3.pdf 1.303Mb PDF View/Open

This item appears in the following Collection(s)


Show full item record