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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Completing the Picture of the Roper Resonance

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Segovia, Jorge [1, 2] ; El-Bennich, Bruno [3, 4] ; Rojas, Eduardo [3, 5] ; Cloet, Ian C. [6] ; Roberts, Craig D. [6] ; Xu, Shu-Sheng [7] ; Zong, Hong-Shi [7]
Total Authors: 7
[1] Univ Salamanca, Grp Fis Nucl, E-37008 Salamanca - Spain
[2] Univ Salamanca, IUFFyM, E-37008 Salamanca - Spain
[3] Univ Cruzeiro Sul, Lab Fis Teor & Computac, BR-01506000 Sao Paulo, SP - Brazil
[4] Univ Estadual Paulista, Inst Fis Teor, BR-01140070 Sao Paulo, SP - Brazil
[5] Univ Antioquia, Inst Fis, Medellin - Colombia
[6] Argonne Natl Lab, Div Phys, Argonne, IL 60439 - USA
[7] Nanjing Univ, Dept Phys, Nanjing 210093, Jiangsu - Peoples R China
Total Affiliations: 7
Document type: Journal article
Source: Physical Review Letters; v. 115, n. 17 OCT 21 2015.
Web of Science Citations: 54

We employ a continuum approach to the three valence-quark bound-state problem in relativistic quantum field theory to predict a range of properties of the proton's radial excitation and thereby unify them with those of numerous other hadrons. Our analysis indicates that the nucleon's first radial excitation is the Roper resonance. It consists of a core of three dressed quarks, which expresses its valence-quark content and whose charge radius is 80% larger than the proton analogue. That core is complemented by a meson cloud, which reduces the observed Roper mass by roughly 20%. The meson cloud materially affects long-wavelength characteristics of the Roper electroproduction amplitudes but the quark core is revealed to probes with Q(2) greater than or similar to 3m(N)(2). (AU)

FAPESP's process: 12/03275-8 - Unquenching effects in heavy mesons
Grantee:Eduardo Rojas Pena
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 13/16088-4 - Hadron Physics in the era of the 12 GeV upgrade at Jefferson Lab and new flavor-physics facilities
Grantee:Bruno El-Bennich
Support type: Regular Research Grants