Precise predictions for Λb → Λcl-(v)over-barl decays

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|
作者：
Sutcliffe, William [1 ]
机构：
[1] Karlsruhe Inst Technol, Karlsruhe, Germany
来源：
EUROPEAN PHYSICAL SOCIETY CONFERENCE ON HIGH ENERGY PHYSICS, EPS-HEP2019 | 2020年
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中图分类号：
O412 [相对论、场论]; O572.2 [粒子物理学];
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摘要：
These proceedings summarise recent work in which the Standard Model and New Physics form factors of Lambda(b) -> Lambda(c)l(-)(v) over bar (l) decays were computed up to order O(Lambda(2)(QCD)/m(c)(2)) using Heavy Quark Effective Theory (HQET). This allowed for a subsequent HQET-based determination of form factors of the decay using a fit, which combines recent theoretical predictions and experimental measurements. Consequently, the most precise value of R(Lambda(c)) to date was determined, R(Lambda(c)) = 0.324 +/- 0.004. Additionally, the sensitivity of R(Lambda(c)) to potential NP interactions was explored.
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