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

Ligeti, Zoltan; Papucci, Michele; Robinson, Dean J.

doi:10.1007/JHEP01(2017)083

Title: New physics in the visible final states of B → D(*) τν

Journal Article · Wed Jan 18 00:00:00 EST 2017 · Journal of High Energy Physics (Online)

DOI:https://doi.org/10.1007/JHEP01(2017)083· OSTI ID:1408404

Ligeti, Zoltan ^[1]; Papucci, Michele ^[1]; Robinson, Dean J. ^[2]

Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States); Univ. of Cincinnati, OH (United States)

We derive compact expressions for the helicity amplitudes of the many-body B → D (*) (→ DY)τ(→ Xν)ν decays, specifically for X = ℓν or π and Y = π or γ. 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 τ and D * decay products which are missed in analyses that treat the τ or D * or both as stable. The τ interference effects are sizable, formally of order m_τ/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 τ 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.

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Research Organization:: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1408404

Journal Information:: Journal of High Energy Physics (Online), Vol. 2017, Issue 1; ISSN 1029-8479

Publisher:: Springer BerlinCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 40 works

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Review of lepton universality tests in B decays Bifani, Simone; Descotes-Genon, Sébastien; Vidal, Antonio Romero Journal of Physics G: Nuclear and Particle Physics, Vol. 46, Issue 2 https://doi.org/10.1088/1361-6471/aaf5de	journal	December 2018
Probing new physics with $\bar{B} \to ρ (770) ℓ^{-} {\bar{ν}}_{ℓ}$ and $\bar{B} \to a_{1} (1260) ℓ^{-} {\bar{ν}}_{ℓ}$ Colangelo, P.; De Fazio, F.; Loparco, F. Physical Review D, Vol. 100, Issue 7 https://doi.org/10.1103/physrevd.100.075037	journal	October 2019
Revisiting R-parity violating interactions as an explanation of the B-physics anomalies Trifinopoulos, Sokratis The European Physical Journal C, Vol. 78, Issue 10 https://doi.org/10.1140/epjc/s10052-018-6280-4	journal	October 2018
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Model-independent analysis of semileptonic B decays to D** for arbitrary new physics Bernlochner, Florian U.; Ligeti, Zoltan; Robinson, Dean J. Karlsruhe https://doi.org/10.5445/ir/1000082438	text	January 2018
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Revisiting R-parity violating interactions as an explanation of the B-physics anomalies Trifinopoulos, Sokratis arXiv https://doi.org/10.48550/arxiv.1807.01638	text	January 2018
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