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Title: Chiral Mass Splitting for cs-bar and cn-bar Mesons in the U-tilde(12)-Classification Scheme of Hadrons

Abstract

We investigate the chiral mass splitting of parity-doubled J = 0, 1 states for cs-bar and cn-bar meson systems in the U-tilde(12)SF-classification scheme of hadrons, using the linear sigma model to describe the light-quark pseudoscalar and scalar mesons together with the spontaneous breaking of chiral symmetry, and consequently predict the masses of as-yet-unobserved (0+, 1+) cn-bar mesons. We also mention some indications of their existence in the recent published data from the Belle and BABAR Collaborations.

Authors:
;  [1];  [2]
  1. Department of Engineering Science, Junior College Funabashi Campus, Nihon University, Funabashi 274-8501 (Japan)
  2. Research Institute of Science and Technology, College of Science and Technology, Nihon University, Tokyo 101-8308 (Japan)
Publication Date:
OSTI Identifier:
20798112
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 814; Journal Issue: 1; Conference: 11. international conference on hadron spectroscopy, Rio de Janeiro (Brazil), 21-26 Aug 2005; Other Information: DOI: 10.1063/1.2176522; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; CHIRAL SYMMETRY; CHIRALITY; CLASSIFICATION; D QUARKS; MESON SPECTROSCOPY; MULTIPARTICLE SPECTROMETERS; PARITY; PARTICLE IDENTIFICATION; PSEUDOSCALAR MESONS; S STATES; SCALAR MESONS; SIGMA MODEL; SYMMETRY BREAKING; U QUARKS

Citation Formats

Yamada, Kenji, Maeda, Tomohito, and Ishida, Shin. Chiral Mass Splitting for cs-bar and cn-bar Mesons in the U-tilde(12)-Classification Scheme of Hadrons. United States: N. p., 2006. Web. doi:10.1063/1.2176522.
Yamada, Kenji, Maeda, Tomohito, & Ishida, Shin. Chiral Mass Splitting for cs-bar and cn-bar Mesons in the U-tilde(12)-Classification Scheme of Hadrons. United States. doi:10.1063/1.2176522.
Yamada, Kenji, Maeda, Tomohito, and Ishida, Shin. Sat . "Chiral Mass Splitting for cs-bar and cn-bar Mesons in the U-tilde(12)-Classification Scheme of Hadrons". United States. doi:10.1063/1.2176522.
@article{osti_20798112,
title = {Chiral Mass Splitting for cs-bar and cn-bar Mesons in the U-tilde(12)-Classification Scheme of Hadrons},
author = {Yamada, Kenji and Maeda, Tomohito and Ishida, Shin},
abstractNote = {We investigate the chiral mass splitting of parity-doubled J = 0, 1 states for cs-bar and cn-bar meson systems in the U-tilde(12)SF-classification scheme of hadrons, using the linear sigma model to describe the light-quark pseudoscalar and scalar mesons together with the spontaneous breaking of chiral symmetry, and consequently predict the masses of as-yet-unobserved (0+, 1+) cn-bar mesons. We also mention some indications of their existence in the recent published data from the Belle and BABAR Collaborations.},
doi = {10.1063/1.2176522},
journal = {AIP Conference Proceedings},
number = 1,
volume = 814,
place = {United States},
year = {Sat Feb 11 00:00:00 EST 2006},
month = {Sat Feb 11 00:00:00 EST 2006}
}
  • The radiative transitions between ground-states of light qq-bar mesons are investigated in the U-tilde(12)-classification scheme. In this scheme the rich decay-spectra are offered even in transition between ground states due to the appearance of 'chiral states', out of the framework of non-relativistic quark model(NRQM) based on the SU(6)-symmetry, and it is shown that these states play an important role to improve our previous results, obtained without considering them.
  • Mass distributions of {pi}+{pi}-{pi}0 and {omega}{pi}0 systems obtained by several experiments are analyzed. We obtain indication of extra vector mesons {omega}(1250) and {rho}(1250) in lower mass region. Those state are expected to exist in the U-tilde(12)-classification scheme.
  • Several years ago we have proposed a manifestly covariant U-tilde(12)SF-classification scheme of hadrons, which maintains the successful SU(6)SF x O(3)L framework in Non-Relativistic Quark Model and is also reconcilable with the mechanism of Spontaneously-Broken Chiral Symmetry in Relativistic Field Theoretical Models. The essential point here is to notice the overlooked freedom of the SU(2){rho}-spin for (confined) light quarks, which leads to existence of new type of 'exotic' hadrons, called 'chiralons' and to a selection rule, {rho}3-line rule, on the spectator quark line.A series of puzzling new hadrons recently observed such as X(3872)-meson family and {theta}(1540) and so on are possiblymore » classified mostly as chiralons.« less
  • The properties of four quark cn-n-barc-bar states are investigated as cn di-quark and n-barc-bar di-antiquark system in U-tilde(12)-classification scheme of hadrons. We consider the negative-parity di-quark and di-antiquark in ground states, and the properties of X(3872) and Y(3940) are consistent, respectively, with those of the JPC = 1++ and 2++ states from these negative-parity di-quark and di-antiquark. Their narrow-widths are explained from a kind of conservation law, called {rho}3-line rule. The properties of ground-state cs-s-barc-bar system are also predicted in this scheme.
  • I classify exotic hadrons into two types, 'genuine' and 'hidden' exotics, and propose that the 'hidden' exotics would be interpreted as 'chiralons' in the U-tilde(12){sub SF}xO(3,1){sub L}-classification scheme of hadrons. Based upon this conjecture I investigate the mass spectrum of 1S, 1P, and 2S states for the cc-bar system by use of a phenomenological mass formula with the spin-dependent interactions and present possible assignments for exotic neutral charmonium-like states which were recently discovered. It is also mentioned that some J{sup PC}-exotic states predicted in this scheme might correspond to those found in a recent lattice QCD calculation of the charmoniummore » spectrum.« less