Perturbative corrections to Λb → Λ form factors from QCD light-cone sum rules

被引:64
|
作者
Wang, Yu-Ming [1 ,2 ]
Shen, Yue-Long [3 ]
机构
[1] Univ Vienna, Fak Phys, Boltzmanngasse 5, A-1090 Vienna, Austria
[2] Tech Univ Munich, Phys Dept T31, James Franck Str 1, D-85748 Garching, Germany
[3] Ocean Univ China, Coll Informat Sci & Engn, Songling Rd 238, Qingdao 266100, Shandong, Peoples R China
来源
关键词
Resummation; Heavy Quark Physics; Perturbative QCD; MESON DISTRIBUTION AMPLITUDE; TO-LEADING ORDER; HEAVY BARYONS; QUARK CURRENTS; RARE DECAYS; GAMMA; RENORMALIZATION; NUCLEON;
D O I
10.1007/JHEP02(2016)179
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 compute radiative corrections to Lambda(b) -> Lambda from factors, at next-to-leading logarithmic accuracy, from QCD light-cone sum rules with Lambda(b)-baryon distribution amplitudes. Employing the diagrammatic approach factorization of the vacuum-to-Lambda(b)-baryon correlation function is justified at leading power in Lambda/m(b), with the aid of the method of regions. Hard functions entering the factorization formulae are identical to the corresponding matching coefficients of heavy-to-light currents from QCD onto soft-collinear effective theory. The universal jet function from integrating out the hard-collinear fluctuations exhibits richer structures compared with the one involved in the factorization expressions of the vacuum-to-B-meson correlation function. Based upon the QCD resummation improved sum rules we observe that the perturbative corrections at O(alpha(s)) shift the Lambda(b) -> Lambda from factors at large recoil significantly and the dominant contribution originates from the next-to-leading order jet function instead of the hard coefficient functions. Having at hand the sum rule predictions for the Lambda(b) -> Lambda from factors we further investigate several decay observables in the electro-weak penguin Lambda(b) -> Lambda l(+)l(-) transitions in the factorization limit (i.e., ignoring the "non-factorizable" hadronic effects which cannot be expressed in terms of the Lambda(b) -> Lambda from factors), including the invariant mass distribution of the lepton pair, the forward-backward asymmetry in the dilepton system and the longitudinal polarization fraction of the leptonic sector.
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页数:51
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