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Title: Evidence for Exotic Hadron Contributions to Λ b 0 J / ψ p π Decays

Journal Article · · Physical Review Letters
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A full amplitude analysis of Λ0b→J/ψpπ decays is performed with a data sample acquired with the LHCb detector from 7 and 8 TeV pp collisions, corresponding to an integrated luminosity of 3 fb–1. A significantly better description of the data is achieved when, in addition to the previously observed nucleon excitations N→pπ, either the Pc(4380)+ and Pc(4450)+→J/ψp states, previously observed in Λ0b→J/ψpK decays, or the Zc(4200)→J/ψπ state, previously reported in B0→J/ψK+π decays, or all three, are included in the amplitude models. The data support a model containing all three exotic states, with a significance of more than three standard deviations. Within uncertainties, the data are consistent with the Pc(4380)+ and Pc(4450)+ production rates expected from their previous observation taking account of Cabibbo suppression.

Research Organization:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Contributing Organization:
LHCb Collaboration
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1525169
Journal Information:
Physical Review Letters, Vol. 117, Issue 8; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 87 works
Citation information provided by
Web of Science

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Cited By (16)

Measurement of the ratio of branching fractions of the decays Λ b 0  → ψ(2S)Λ and Λ b 0  → J/ψΛ journal March 2019
Study of the D 0 p amplitude in Λ b 0  → D 0 pπ − decays journal May 2017
Investigation of the pentaquark resonance in the N K system journal August 2019
Role of a triangle singularity in the γ p K + Λ ( 1405 ) reaction journal January 2017
Hidden strange pentaquark states in constituent quark models journal November 2018
Triangle singularities in B ¯ 0 χ c 1 K π + relevant to Z 1 ( 4050 ) and Z 2 ( 4250 ) journal July 2019
Exotic pentaquark states with the q q Q Q Q ¯ configuration journal September 2019
Hidden-charm pentaquarks and their hidden-bottom and B c -like partner states journal February 2017
Charmless two-body antitriplet b -baryon decays journal May 2017
Remarks on the Pc structures and triangle singularities journal October 2016
Width of a two-body coupled-channel resonance journal March 2018
Analysis of the D̄Σc, D̄Σc∗, D̄∗Σc and D̄∗Σc∗ pentaquark molecular states with QCD sum rules journal July 2019
Measurement of the ratio of branching fractions of the decays Λ b 0  → ψ(2S)Λ and Λ b 0  → J/ψΛ text January 2019
Charmless two-body anti-triplet $b$-baryon decays text January 2017
Hidden-charm and bottom meson-baryon molecules coupled with five-quark states text January 2017
Width of a two-body coupled-channel resonance text January 2018

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