$Angular analysis of the rare decay Λ b → Λ 1520 → N K ¯ ℓ + ℓ − $$ {\Lambda}_b\to \Lambda (1520)\left(\to N\overline{K}\right){\ell}^{+}{\ell}^{-} $$$

Angular analysis of the rare decay Λ b → Λ 1520 → N K ¯ ℓ + ℓ − $$ {\Lambda}_b\to \Lambda (1520)\left(\to N\overline{K}\right){\ell}^{+}{\ell}^{-} $$

Abstract We study the differential decay rate for the rare decay Λ b → Λ 1520 → N K ¯ ℓ + ℓ − $$ {\Lambda}_b\to \Lambda (1520)\left(\to N\overline{K}\right){\ell}^{+}{\ell}^{-} $$ where ℓ is a light lepton and N K ¯ = p K − $$ N\overline{K}=p{K}^{-} $$ , n K ¯ 0 $$ n{\overline{K}}^0 $$ , as this dec...

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Main Authors:	S. Descotes-Genon, M. Novoa Brunet
Format:	Article
Language:	English
Published:	SpringerOpen 2019-06-01
Series:	Journal of High Energy Physics
Subjects:	Heavy Quark Physics Beyond Standard Model Effective Field Theories
Online Access:	http://link.springer.com/article/10.1007/JHEP06(2019)136

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spelling	doaj-452eda96fe1b4eb289246cc673bbc1aa2020-11-25T03:46:46ZengSpringerOpenJournal of High Energy Physics1029-84792019-06-012019613810.1007/JHEP06(2019)136Angular analysis of the rare decay Λ b → Λ 1520 → N K ¯ ℓ + ℓ − $$ {\Lambda}_b\to \Lambda (1520)\left(\to N\overline{K}\right){\ell}^{+}{\ell}^{-} $$S. Descotes-Genon0M. Novoa Brunet1Laboratoire de Physique Théorique (UMR 8627), CNRS, Univ. Paris-Sud, Université Paris-SaclayLaboratoire de Physique Théorique (UMR 8627), CNRS, Univ. Paris-Sud, Université Paris-SaclayAbstract We study the differential decay rate for the rare decay Λ b → Λ 1520 → N K ¯ ℓ + ℓ − $$ {\Lambda}_b\to \Lambda (1520)\left(\to N\overline{K}\right){\ell}^{+}{\ell}^{-} $$ where ℓ is a light lepton and N K ¯ = p K − $$ N\overline{K}=p{K}^{-} $$ , n K ¯ 0 $$ n{\overline{K}}^0 $$ , as this decay mode can provide new and complementary constraints on the Wilson coefficients in b → sℓ + ℓ − transitions compared to other modes. We provide a determination of the complete angular distribution, assuming unpolarised Λ b baryons and neglecting the lepton mass. The resulting angular observables are expressed in terms of helicity amplitudes involving hadronic form factors within the Standard Model and New Physics models with chirality-flipped operators. We study these observables at low and large Λ recoils, using effective theories to determine relations among the hadronic form factors involved. As there is currently no determination of the form factors available from lattice simulations or light-cone sum rules, we perform a first illustration of the sensitivity of some observables to New Physics contributions using hadronic inputs from quark models.http://link.springer.com/article/10.1007/JHEP06(2019)136Heavy Quark PhysicsBeyond Standard ModelEffective Field Theories
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	S. Descotes-Genon M. Novoa Brunet
spellingShingle	S. Descotes-Genon M. Novoa Brunet Angular analysis of the rare decay Λ b → Λ 1520 → N K ¯ ℓ + ℓ − $$ {\Lambda}_b\to \Lambda (1520)\left(\to N\overline{K}\right){\ell}^{+}{\ell}^{-} $$ Journal of High Energy Physics Heavy Quark Physics Beyond Standard Model Effective Field Theories
author_facet	S. Descotes-Genon M. Novoa Brunet
author_sort	S. Descotes-Genon
title	Angular analysis of the rare decay Λ b → Λ 1520 → N K ¯ ℓ + ℓ − $$ {\Lambda}_b\to \Lambda (1520)\left(\to N\overline{K}\right){\ell}^{+}{\ell}^{-} $$
title_short	Angular analysis of the rare decay Λ b → Λ 1520 → N K ¯ ℓ + ℓ − $$ {\Lambda}_b\to \Lambda (1520)\left(\to N\overline{K}\right){\ell}^{+}{\ell}^{-} $$
title_full	Angular analysis of the rare decay Λ b → Λ 1520 → N K ¯ ℓ + ℓ − $$ {\Lambda}_b\to \Lambda (1520)\left(\to N\overline{K}\right){\ell}^{+}{\ell}^{-} $$
title_fullStr	Angular analysis of the rare decay Λ b → Λ 1520 → N K ¯ ℓ + ℓ − $$ {\Lambda}_b\to \Lambda (1520)\left(\to N\overline{K}\right){\ell}^{+}{\ell}^{-} $$
title_full_unstemmed	Angular analysis of the rare decay Λ b → Λ 1520 → N K ¯ ℓ + ℓ − $$ {\Lambda}_b\to \Lambda (1520)\left(\to N\overline{K}\right){\ell}^{+}{\ell}^{-} $$
title_sort	angular analysis of the rare decay λ b → λ 1520 → n k ¯ ℓ + ℓ − $$ {\lambda}_b\to \lambda (1520)\left(\to n\overline{k}\right){\ell}^{+}{\ell}^{-} $$
publisher	SpringerOpen
series	Journal of High Energy Physics
issn	1029-8479
publishDate	2019-06-01
description	Abstract We study the differential decay rate for the rare decay Λ b → Λ 1520 → N K ¯ ℓ + ℓ − $$ {\Lambda}_b\to \Lambda (1520)\left(\to N\overline{K}\right){\ell}^{+}{\ell}^{-} $$ where ℓ is a light lepton and N K ¯ = p K − $$ N\overline{K}=p{K}^{-} $$ , n K ¯ 0 $$ n{\overline{K}}^0 $$ , as this decay mode can provide new and complementary constraints on the Wilson coefficients in b → sℓ + ℓ − transitions compared to other modes. We provide a determination of the complete angular distribution, assuming unpolarised Λ b baryons and neglecting the lepton mass. The resulting angular observables are expressed in terms of helicity amplitudes involving hadronic form factors within the Standard Model and New Physics models with chirality-flipped operators. We study these observables at low and large Λ recoils, using effective theories to determine relations among the hadronic form factors involved. As there is currently no determination of the form factors available from lattice simulations or light-cone sum rules, we perform a first illustration of the sensitivity of some observables to New Physics contributions using hadronic inputs from quark models.
topic	Heavy Quark Physics Beyond Standard Model Effective Field Theories
url	http://link.springer.com/article/10.1007/JHEP06(2019)136
work_keys_str_mv	AT sdescotesgenon angularanalysisoftheraredecaylbl1520nklllambdabtolambda1520lefttonoverlinekrightellell AT mnovoabrunet angularanalysisoftheraredecaylbl1520nklllambdabtolambda1520lefttonoverlinekrightellell
_version_	1724504276249608192

Angular analysis of the rare decay Λ b → Λ 1520 → N K ¯ ℓ + ℓ − $$ {\Lambda}_b\to \Lambda (1520)\left(\to N\overline{K}\right){\ell}^{+}{\ell}^{-} $$

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