Rare radiative charm decays within the standard model and beyond

被引：23
作者：
de Boer, Stefan [1 ]
Hiller, Gudrun [1 ]
机构：
[1] TU Dortmund, Fak Phys, Otto Hahn Str 4, D-44221 Dortmund, Germany
来源：
JOURNAL OF HIGH ENERGY PHYSICS | 2017年 / 08期
关键词：
Beyond Standard Model; Heavy Quark Physics; TO-LEADING ORDER; K-ASTERISK-GAMMA; LONG-DISTANCE; FORM-FACTORS; HEAVY; QCD; PHYSICS; MESONS; CONSTRAINTS; LEPTOQUARKS;
D O I：
10.1007/JHEP08(2017)091
中图分类号：
O412 [相对论、场论]; O572.2 [粒子物理学];
学科分类号：
摘要：
We present standard model (SM) estimates for exclusive c -> u gamma processes in heavy quark and hybrid frameworks. Measured branching ratios B(D-0 -> (phi,K*(0)) gamma) are at or somewhat exceeding the upper range of the SM and suggest slow convergence of the 1/m(D) , alpha(s) -expansion. Model-independent constraints on |Delta C| - | Delta U | = 1 dipole operators from a"notsign B(D-0 -> (phi,K*(0)) gamma) data are obtained. Predictions and implications for leptoquark models are worked out. While branching ratios are SM-like CP asymmetries less than or similar to 10% can be induced. In SUSY deviations from the SM can be even larger with CP asymmetries of O(0.1). If A(c) -baryons are produced polarized, such as at the Z-pole, an angular asymmetry in A(c) -> p gamma decays can be studied that is sensitive to chirality-flipped contributions.
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页数：33
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