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Title: Light-meson masses in an unquenched quark model

We perform a coupled-channels calculation of the masses of light mesons with the quantum numbers IJ P=-, (I,J) = 0,1, by including $$q\bar{q}$$ and ($$q\bar{q}$$) 2 components in a nonrelativistic chiral quark model. The coupling between two- and four-quark configurations is realized through a 3P 0 quark-pair creation model. With the usual form of this operator, the mass shifts are large and negative, an outcome which raises serious issues of validity for the quenched quark model. Therefore, we introduce some improvements of the 3P 0 operator in order to reduce the size of the mass shifts. By introducing two simple factors, physically well motivated, the coupling between $$q\bar{q}$$ and ($$q\bar{q}$$) 2 components is weakened, producing mass shifts that are around 10%–20% of hadron bare masses.
Authors:
 [1] ;  [2] ;  [3] ;  [4]
  1. Jinling Inst. of Technology, Nanjing (China). College of Science
  2. Nanjing Normal Univ. (China). Dept. of Physics
  3. Argonne National Lab. (ANL), Argonne, IL (United States). Physics Division
  4. Autonomous Univ. of Barcelona, Bellaterra (Spain). Inst. for High Energy Physics (IFAE) and Barcelona Inst. of Science and Technology (BIST)
Publication Date:
Grant/Contract Number:
AC02-06CH11357; 11535005; 11775118; 11205091; 665919; IJCI-2016-30028; FPA2014-55613-P; SEV-2016-0588
Type:
Accepted Manuscript
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 97; Journal Issue: 9; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society (APS)
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26); National Natural Science Foundation of China (NNSFC); Ministry of Education (MOE) of the People's Republic of China; European Union (EU); Ministry of Economy, Industry and Competitiveness (MINECO)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; bound states; hadronic decays; light mesons; mass
OSTI Identifier:
1439869
Alternate Identifier(s):
OSTI ID: 1437510