Measurement of the B -> Xs gamma branching fraction and photon energy spectrum using the recoil method

HU Flaecher

doi:10.1103/PhysRevD.77.051103

Measurement of the B -> Xs gamma branching fraction and photon energy spectrum using the recoil method

HU Flaecher

School of Physics

Research output: Contribution to journal › Article (Academic Journal) › peer-review

76 Citations (Scopus)

Abstract

We present a measurement of the branching fraction and photon-energy spectrum for the decay B -> Xs gamma using data from the BABAR experiment. The data sample corresponds to an integrated luminosity of 210/fb, from which approximately 680000 BBbar events are tagged by a fully reconstructed hadronic decay of one of the B mesons. In the decay of the second B meson, an isolated high-energy photon is identified. We measure BF(B -> Xs gamma) = (3.66 +- 0.85stat +- 0.60syst) 10^-4 for photon energies E_gamma above 1.9 GeV in the B rest frame. From the measured spectrum we calculate the first and second moments for different minimum photon energies, which are used to extract the heavy-quark parameters mb and mu_pi^2. In addition, measurements of the direct CP asymmetry and isospin asymmetry are presented.

Translated title of the contribution	Measurement of the B -> Xs gamma branching fraction and photon energy spectrum using the recoil method
Original language	English
Pages (from-to)	051103-1 - 051103-8
Number of pages	8
Journal	Physical Review D: Particles, Fields, Gravitation and Cosmology
Volume	77
DOIs	https://doi.org/10.1103/PhysRevD.77.051103
Publication status	Published - Mar 2008

Bibliographical note

Author of Publication Reviewed: BaBar Collaboration, B. Aubert et al

Access to Document

10.1103/PhysRevD.77.051103

http://link.aps.org/doi/10.1103/PhysRevD.77.051103

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title = "Measurement of the B -> Xs gamma branching fraction and photon energy spectrum using the recoil method",

abstract = "We present a measurement of the branching fraction and photon-energy spectrum for the decay B -> Xs gamma using data from the BABAR experiment. The data sample corresponds to an integrated luminosity of 210/fb, from which approximately 680000 BBbar events are tagged by a fully reconstructed hadronic decay of one of the B mesons. In the decay of the second B meson, an isolated high-energy photon is identified. We measure BF(B -> Xs gamma) = (3.66 +- 0.85stat +- 0.60syst) 10^-4 for photon energies E_gamma above 1.9 GeV in the B rest frame. From the measured spectrum we calculate the first and second moments for different minimum photon energies, which are used to extract the heavy-quark parameters mb and mu_pi^2. In addition, measurements of the direct CP asymmetry and isospin asymmetry are presented.",

author = "HU Flaecher",

note = "Author of Publication Reviewed: BaBar Collaboration, B. Aubert et al",

year = "2008",

month = mar,

doi = "10.1103/PhysRevD.77.051103",

language = "English",

volume = "77",

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journal = "Physical Review D: Particles, Fields, Gravitation and Cosmology",

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publisher = "American Physical Society (APS)",

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T1 - Measurement of the B -> Xs gamma branching fraction and photon energy spectrum using the recoil method

AU - Flaecher, HU

N1 - Author of Publication Reviewed: BaBar Collaboration, B. Aubert et al

PY - 2008/3

Y1 - 2008/3

N2 - We present a measurement of the branching fraction and photon-energy spectrum for the decay B -> Xs gamma using data from the BABAR experiment. The data sample corresponds to an integrated luminosity of 210/fb, from which approximately 680000 BBbar events are tagged by a fully reconstructed hadronic decay of one of the B mesons. In the decay of the second B meson, an isolated high-energy photon is identified. We measure BF(B -> Xs gamma) = (3.66 +- 0.85stat +- 0.60syst) 10^-4 for photon energies E_gamma above 1.9 GeV in the B rest frame. From the measured spectrum we calculate the first and second moments for different minimum photon energies, which are used to extract the heavy-quark parameters mb and mu_pi^2. In addition, measurements of the direct CP asymmetry and isospin asymmetry are presented.

AB - We present a measurement of the branching fraction and photon-energy spectrum for the decay B -> Xs gamma using data from the BABAR experiment. The data sample corresponds to an integrated luminosity of 210/fb, from which approximately 680000 BBbar events are tagged by a fully reconstructed hadronic decay of one of the B mesons. In the decay of the second B meson, an isolated high-energy photon is identified. We measure BF(B -> Xs gamma) = (3.66 +- 0.85stat +- 0.60syst) 10^-4 for photon energies E_gamma above 1.9 GeV in the B rest frame. From the measured spectrum we calculate the first and second moments for different minimum photon energies, which are used to extract the heavy-quark parameters mb and mu_pi^2. In addition, measurements of the direct CP asymmetry and isospin asymmetry are presented.

U2 - 10.1103/PhysRevD.77.051103

DO - 10.1103/PhysRevD.77.051103

M3 - Article (Academic Journal)

VL - 77

SP - 051103-1 - 051103-8

JO - Physical Review D: Particles, Fields, Gravitation and Cosmology

JF - Physical Review D: Particles, Fields, Gravitation and Cosmology

SN - 1550-7998

ER -