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Journal Article
Endpoint relations for baryons
2021
Overview
A
bstract
Following our earlier work we establish kinematic endpoint relations for baryon decays using the Wigner-Eckart theorem and apply them to
1
2
→
1
2
and
1
2
→
3
2
baryon transitions. We provide angular distributions at the kinematic endpoint which hold for the generic
d
= 6 model-independent effective Hamiltonian and comment on the behaviour in the vicinity of the endpoint. Moreover, we verify the endpoint relations, using an explicit form factor parametrisation, and clarify constraints on helicity-based form factors to evidence endpoint relations. Our results provide guidance for phenomenological parameterisations, consistency checks for theory computations and experiment. Results are applicable to ongoing and future new physics searches at LHCb, BES III and Belle II with rare semileptonic-, dineutrino-and charged-modes, which include Λ
b
→ Λ
(*)
ℓℓ,
Λ
b
→ Λ
(*)
νν
, Ω
b
→ Ω
ℓℓ
, Λ
c
→
pℓℓ
, Σ →
pℓℓ
and Λ
b
→
Λ
c
∗
ℓν
.
Publisher
Springer Berlin Heidelberg,Springer Nature B.V,SpringerOpen
