Artículos de revistas
Completing the Picture of the Roper Resonance
Fecha
2015-10-21Registro en:
Physical Review Letters. College Pk: Amer Physical Soc, v. 115, n. 17, 6 p., 2015.
0031-9007
10.1103/PhysRevLett.115.171801
WOS:000363243700003
WOS000363243700003.pdf
Autor
Univ Salamanca
Univ Cruzeiro Sul
Universidade Estadual Paulista (Unesp)
Univ Antioquia
Argonne Natl Lab
Nanjing Univ
Institución
Resumen
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).