Amb motiu del tancament d'estiu, la validació de documents es reprendrà a partir del 28 d'agost de 2026. Disculpeu les molèsties.
Con motivo del cierre de verano, la validación de documentos se reanudará a partir del 28 de agosto de 2026. Disculpad las molestias
Due to the summer closure, document validation will resume starting August 28, 2026. We apologize for any inconvenience.

Files

632430.pdf (209.08 KB)

Document type

Article

Version

Published version

Publication date

2012-11-09

All rights reserved

Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/133260

Precision Measurement of the B→Xsγ Photon Energy Spectrum, Branching Fraction, and Direct CP Asymmetry ACP(B→Xs+dγ)

Journal Title

Authors

Director/Tutor

Journal ISSN

Volume Title

Related resource

https://doi.org/10.1103/PhysRevLett.109.191801

Abstract

The photon spectrum in the inclusive electromagnetic radiative decays of the B meson, B → X s γ plus B → X d γ , is studied using a data sample of ( 382.8 ± 4.2 ) × 10 6 Υ ( 4 S ) → B ¯¯¯ B decays collected by the BABAR experiment at SLAC. The spectrum is used to extract the branching fraction B ( B → X s γ ) = ( 3.21 ± 0.33 ) × 10 − 4 for E γ > 1.8     GeV and the direct C P asymmetry A C P ( B → X s + d γ ) = 0.057 ± 0.063 . The effects of detector resolution and Doppler smearing are unfolded to measure the photon energy spectrum in the B meson rest frame.

Subject

Física de partícules, Experiments

Subject (English)

Particle physics, Experiments

Citation

Collections

Articles publicats en revistes (Física Quàntica i Astrofísica)

Citation

GARRA TICÓ, Jordi, GRAUGÉS POUS, Eugeni and BABAR Collaboration. Precision Measurement of the B→Xsγ Photon Energy Spectrum, Branching Fraction, and Direct CP Asymmetry ACP(B→Xs+dγ). Physical Review Letters. 2012. Vol. 109, num. 19. ISSN 0031-9007. [consulted: 9 of August of 2026]. Available at: https://hdl.handle.net/2445/133260

Export metadata

JSON - METS

Share record