Interpretation of the LHCb ${P}_{c}(4312{)}^{+}$ Signal

Open Access

Interpretation of the LHCb $P_{c} (4312)^{+}$ Signal

C. Fernández-Ramírez, A. Pilloni, M. Albaladejo, A. Jackura, V. Mathieu, M. Mikhasenko, J. A. Silva-Castro, and A. P. Szczepaniak (Joint Physics Analysis Center)

Phys. Rev. Lett. 123, 092001 – Published 29 August 2019

Abstract

We study the nature of the new signal reported by LHCb in the $J / ψ p$ spectrum. Based on the $S$ -matrix principles, we perform a minimum-bias analysis of the underlying reaction amplitude, focusing on the analytic properties that can be related to the microscopic origin of the $P_{c} (4312)^{+}$ peak. By exploring several amplitude parametrizations, we find evidence for the attractive effect of the $Σ_{c}^{+} {\bar{D}}^{0}$ channel, which is not strong enough, however, to form a bound state.

Received 26 April 2019

DOI:https://doi.org/10.1103/PhysRevLett.123.092001

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP³.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Quark model

Charm quark Exotic baryons

Particles & Fields

Authors & Affiliations

C. Fernández-Ramírez ^1,*, A. Pilloni^2,3,†, M. Albaladejo⁴, A. Jackura^5,6, V. Mathieu^4,7, M. Mikhasenko⁸, J. A. Silva-Castro¹, and A. P. Szczepaniak^4,5,6 (Joint Physics Analysis Center)

¹Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México, Ciudad de México 04510, Mexico
²European Centre for Theoretical Studies in Nuclear Physics and Related Areas (ECT*) and Fondazione Bruno Kessler, I-38123 Villazzano (TN), Italy
³INFN Sezione di Genova, Genova, I-16146, Italy
⁴Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
⁵Center for Exploration of Energy and Matter, Indiana University, Bloomington, Indiana 47403, USA
⁶Physics Department, Indiana University, Bloomington, Indiana 47405, USA
⁷Departamento de Física Teórica, Universidad Complutense de Madrid, 28040 Madrid, Spain
⁸CERN, 1211 Geneva 23, Switzerland

^*cesar.fernandez@nucleares.unam.mx
^†pillaus@jlab.org

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Issue

Vol. 123, Iss. 9 — 30 August 2019

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