Inclusive photon energy spectrum in B decays

1992 ◽  
Author(s):  
C. Greub
Keyword(s):  
Energy Spectrum ◽  
Photon Energy ◽  
B Decays ◽  
Photon Energy Spectrum

scholarly journals ON THE EXPECTED PHOTON SPECTRUM IN B → Xs+ γ AND ITS USES

2002 ◽  
Vol 17 (31) ◽  
pp. 4709-4732 ◽  
Author(s):  
IKAROS BIGI ◽  
NIKOLAI URALTSEV
Keyword(s):  
Energy Spectrum ◽  
Mass Distribution ◽  
Photon Energy ◽  
Lepton Pair ◽  
Photon Spectrum ◽  
Radiative Decays ◽  
B Decays ◽  
Theoretical Evaluation ◽  
Alternative Approaches ◽  
Photon Energy Spectrum

Measuring the photon energy spectrum in radiative B decays provides essential help for gaining theoretical control over semileptonic B transitions. The hadronic recoil mass distribution in B → Xuℓ ν promises the best environment for determining |Vub|. The theoretical uncertainties are largest in the domain of low values of the lepton pair mass q2. Universality relations allow us to describe this domain reliably in terms of the photon spectrum in B → Xs+ γ. A method is proposed to incorporate 1/mbcorrections into this relation. The low-Eγtail in radiative decays is important in the context of extracting |Vub|. We argue that CLEO's recent fit to the spectrum underestimates the fraction of the photon spectrum below 27thinsp;GeV. Potentially significant uncertainties enter in the theoretical evaluation of the integrated end point lepton spectrum or the B → Xuℓ ν width with a too high value of the lower cut on q2in alternative approaches to |Vub|.

Improved spatial resolution and lower-dose pediatric CT imaging: a feasibility study to evaluate narrowing the X-ray photon energy spectrum

2014 ◽  
Vol 44 (8) ◽  
pp. 1026-1030
Author(s):  
Mark G. Benz ◽  
Matthew W. Benz ◽  
Steven B. Birnbaum ◽  
Eric Chason ◽  
Brian W. Sheldon ◽  
...  
Keyword(s):  
Energy Spectrum ◽  
Feasibility Study ◽  
Spatial Resolution ◽  
Photon Energy ◽  
Ct Imaging ◽  
X Ray ◽  
Pediatric Ct ◽  
Photon Energy Spectrum

scholarly journals Measurement of theB→Xsγbranching fraction and photon energy spectrum using the recoil method

2008 ◽  
Vol 77 (5) ◽  
Author(s):  
B. Aubert ◽  
M. Bona ◽  
Y. Karyotakis ◽  
J. P. Lees ◽  
V. Poireau ◽  
...  
Keyword(s):  
Energy Spectrum ◽  
Photon Energy ◽  
Photon Energy Spectrum
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