New physics in the visible final states of B → Dτν(*)

被引:51
作者
Ligeti, Zoltan [1 ,2 ]
Papucci, Michele [1 ,2 ]
Robinson, Dean J. [1 ,2 ,3 ]
机构
[1] Univ Calif Berkeley, Ernest Orlando Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA
[2] Univ Calif Berkeley, Dept Phys, Berkeley Ctr Theoret Phys, Berkeley, CA 94720 USA
[3] Univ Cincinnati, Dept Phys, Cincinnati, OH 45221 USA
基金
美国国家科学基金会;
关键词
Beyond Standard Model; Heavy Quark Physics; R-K; DECAY; RD(ASTERISK); MESONS;
D O I
10.1007/JHEP01(2017)083
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 derive compact expressions for the helicity amplitudes of the many-body B -> D-(*())(-> DY)tau(-> X nu)nu decays, specifically for X = lv or pi and Y = pi or gamma. We include contributions from all ten possible new physics four-Fermi operators with arbitrary couplings. Our results capture interference effects in the full phase space of the visible 7- and D* decay products which are missed in analyses that treat the T or D* or both as stable. The tau interference effects are sizable, formally of order m tau/m(B) for the standard model, and may be of order unity in the presence of new physics. Treating interference correctly is essential when considering kinematic distributions of the tau or D* decay products, and when including experimentally unavoidable phase space cuts. Our amplitude-level results also allow for efficient exploration of new physics effects in the fully differential phase space, by enabling experiments to perform such studies on fully simulated Monte Carlo datasets via efficient event reweighing. As an example, we explore a class of new physics interactions that can fit the observed R(D-(*())) ratios, and show that analyses including more differential kinematic information can provide greater discriminating power for new physics, than single kinematic variables alone.
引用
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页数:28
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