Light-meson masses in an unquenched quark model

Chen, Xiaoyun; Ping, Jialun; Roberts, Craig D.; Segovia, Jorge

doi:10.1103/PhysRevD.97.094016

Title: Light-meson masses in an unquenched quark model

Journal Article · 17 May 2018 · Physical Review D

DOI: https://doi.org/10.1103/PhysRevD.97.094016 · OSTI ID:1439869

Chen, Xiaoyun ^[1]; Ping, Jialun ^[2]; Roberts, Craig D. ^[3]; Segovia, Jorge ^[4]

Jinling Inst. of Technology, Nanjing (China). College of Science
Nanjing Normal Univ. (China). Dept. of Physics
Argonne National Lab. (ANL), Argonne, IL (United States). Physics Division
Autonomous Univ. of Barcelona, Bellaterra (Spain). Inst. for High Energy Physics (IFAE) and Barcelona Inst. of Science and Technology (BIST)

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 ³P₀ 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 ³P₀ 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.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26); National Natural Science Foundation of China (NSFC); Ministry of Education (MOE) of the People's Republic of China; European Union (EU); Ministry of Economy, Industry and Competitiveness (MINECO)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1439869

Journal Information:: Physical Review D, Journal Name: Physical Review D Journal Issue: 9 Vol. 97; ISSN PRVDAQ; ISSN 2470-0010

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Light-meson masses in an unquenched quark model

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