Branching Fraction and Photon Energy Spectrum for<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="italic">b</mml:mi><mml:mi /><mml:mo>→</mml:mo><mml:mi /><mml:mi mathvariant="italic">s</mml:mi><mml:mi mathvariant="italic">γ</mml:mi></mml:math>

Chen, S.; Hinson, J. W.; Lee, J.; Miller, D. H.; Pavlunin, V.; Shibata, E. I.; Shipsey, I. P. J.; Cronin-Hennessy, D.; Lyon, A. L.; Thorndike, E. H.; Coan, T. E.; Fadeyev, V.; Gao, Y. S.; Maravin, Y.; Narsky, I.; Stroynowski, R.; Ye, J.; Włodek, T.; Artuso, M.; Benslama, K.; Boulahouache, C.; Bukin, K.; Dambasuren, E.; Majumder, G.; Mountain, R.; Skwarnicki, T.; Stone, S.; Wang, J. C.; Wolf, A.; Köpp, S.; Kostin, M.; Mahmood, A. H.; Csorna, S. E.; Dankó, I.; McLean, K. W.; Xu, Z.; Godang, R.; Bonvicini, G.; Cinabro, D.; Dubrovin, M.; McGee, Steven; Zhou, G. J.; Bornheim, A.; Lipeles, E.; Pappas, S. P.; Shapiro, A.; Sun, W.; Weinstein, A. J.; Jaffe, D. E.; Mahapatra, R.; Masek, G.; Paar, H. P.; Asner, D. M.; Eppich, A.; Hill, T. S.; Morrison, R. J.; Ferguson, T.; Vogel, H.; Heltsley, B. K.; Hsu, L.; Jones, C. D.; Kandaswamy, J.; Kreinick, D. L.; Lohner, M.; Magerkurth, A.; Meyer, T. O.; Mistry, N. B.

doi:10.1103/physrevlett.87.251807

Cited by 404 publications

(93 citation statements)

References 19 publications

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“…Upon removing the cut, power corrections to the partonic calculation can be formally shown to be of O(Λ 2 /m 2 b ), and they are numerically small, approximately +2.5% of the total BF [7]. The Standard Model BF, which has been determined with about ±10% uncertainty [7,8], is found to be in good agreement with experimental measurements by CLEO, Belle and BaBar [9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 74%

Radiative B decay spectrum: DGE at NNLO

Andersen¹,

Gardi²

2007

J. High Energy Phys.

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We compute the differentialB → X s γ decay width in the Standard Model as a function of the photon energy using Dressed Gluon Exponentiation (DGE). The resummed spectrum is matched with the fixed-order expansion, making use of the next-to-next-toleading order (NNLO) results for the matrix element of the magnetic dipole interaction O 7 and NLO ones for other operators in the effective Weak Hamiltonian. We develop a new technique to implement constraints on the analytic structure of the Sudakov factor in moment space. This improves the behavior of the resummed spectrum away from the Sudakov region. We also derive an analytic expression for the Borel transform of the perturbative series for the O 7 spectrum in the large-β 0 limit. Using this example we demonstrate that exponentiation in moment space is necessary for the calculation of the spectrum for E γ > ∼ 2 GeV. Finally, we investigate numerically the relation between renormalons, power corrections and support properties. We present predictions for the branching fraction and the first few spectral moments as a function of a cut E γ > E 0 and estimate the theoretical uncertainty.

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Section: Introductionmentioning

confidence: 74%

Radiative B decay spectrum: DGE at NNLO

Andersen¹,

Gardi²

2007

J. High Energy Phys.

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“…These "mirror" contributions are just obtained by complex conjugation, and ensure that the rate is real, i.e. G (1) ij is hermitian. We disregard these mirror contributions in the calculation, but at the end we substitute G…”

Section: Jhep01(2015)115 2 Details Of the Calculationmentioning

confidence: 99%

“…Its branching ratio is measured with a precision of ∼ 7% [1][2][3][4][5][6][7][8] To match this experimental precision, a theory calculation to next-to-next-to-leading order (NNLO) accuracy is necessary. This program has been carried out during the last 1 The semi-inclusive measurement in reference [2] has recently been superseded by a new, more precise one -see refs. [9,10].…”

Section: Introductionmentioning

confidence: 99%

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Four-body contributions to B ¯ → X s γ $$ \overline{B}\to {X}_s\gamma $$ at NLO

Huber

Poradziński

Virto

2015

J. High Energ. Phys.

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Ongoing efforts to reduce the perturbative uncertainty in theB → X s γ decay rate have resulted in a theory estimate to NNLO in QCD. However, a few contributions from multi-parton final states which are formally NLO are still unknown. These are parametrically small and included in the estimated error from higher order corrections, but must be computed if one is to claim complete knowledge of theB → X s γ rate to NLO. A major part of these unknown pieces are four-body contributions corresponding to the partonic process b → sqqγ. We compute these NLO four-body contributions toB → X s γ, and confirm the corresponding tree-level leading-order results. While the NLO contributions arise from tree-level and one-loop Feynman diagrams, the four-body phase-space integrations make the computation non-trivial. The decay rate contains collinear logarithms arising from the mass regularization of collinear divergences. We perform an exhaustive numerical analysis, and find that these contributions are positive and amount to no more than ∼ 1% of the total rate in the Standard Model, thus confirming previous estimates of the perturbative uncertainty.

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“…The comparison, used to extract the ratio Vts V cb , agrees with the prediction of the Standard Model, based on the unitarity triangle. Latest experimental results from CLEO collaboration are shown in [60]. Other details about the photon spectrum will be discussed in section (6.1).…”

Section: Photon Spectrummentioning

confidence: 99%

The Standard Model of Elementary Particles

2003

Handbook of Nuclear Chemistry

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Branching Fraction and Photon Energy Spectrum forb→sγ

Cited by 404 publications

References 19 publications

Radiative B decay spectrum: DGE at NNLO

Radiative B decay spectrum: DGE at NNLO

Four-body contributions to B ¯ → X s γ $$ \overline{B}\to {X}_s\gamma $$ at NLO

The Standard Model of Elementary Particles

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