Quarkonium h states as arbiters of exoticity

Richard Lebed; Eric S. Swanson

doi:10.1103/PhysRevD.96.056015

Quarkonium h states as arbiters of exoticity

Richard Lebed, Eric S. Swanson

Physics

Research output: Contribution to journal › Article › peer-review

14 Scopus citations

Abstract

The mass splitting between the quarkonium spin-singlet state h (JPC=1+-) and the spin average of the quarkonium spin-triplet states χ (JPC=0++,1++,2++) is seen to be astonishingly small, not only in the charmonium and bottomonium cases where the relevant masses have been measured, but in positronium as well. We find, both in nonrelativistic quark models and in nonrelativistic quantum chromodynamics (NRQCD), that this hyperfine splitting is so small that it can be used as a test of the pure QQ- content of the states. We discuss the 2P states of charmonium in the vicinity of 3.9 GeV, where the putative exotics X(3872) and X(3915) have been seen and a new χc0(2P) candidate has been observed at Belle.

Original language	English (US)
Article number	056015
Journal	Physical Review D
Volume	96
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevD.96.056015
State	Published - Sep 1 2017

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

Access to Document

10.1103/PhysRevD.96.056015

Cite this

@article{a930389e47a0498daf6b53556f036c69,

title = "Quarkonium h states as arbiters of exoticity",

abstract = "The mass splitting between the quarkonium spin-singlet state h (JPC=1+-) and the spin average of the quarkonium spin-triplet states χ (JPC=0++,1++,2++) is seen to be astonishingly small, not only in the charmonium and bottomonium cases where the relevant masses have been measured, but in positronium as well. We find, both in nonrelativistic quark models and in nonrelativistic quantum chromodynamics (NRQCD), that this hyperfine splitting is so small that it can be used as a test of the pure QQ- content of the states. We discuss the 2P states of charmonium in the vicinity of 3.9 GeV, where the putative exotics X(3872) and X(3915) have been seen and a new χc0(2P) candidate has been observed at Belle.",

author = "Richard Lebed and Swanson, {Eric S.}",

note = "Funding Information: We gratefully acknowledge H. Lamm, R. E. Mitchell, and S. Olsen for their expert advice. This work was supported by the National Science Foundation under Grant No. PHY-1403891. Publisher Copyright: {\textcopyright} 2017 American Physical Society.",

year = "2017",

month = sep,

day = "1",

doi = "10.1103/PhysRevD.96.056015",

language = "English (US)",

volume = "96",

journal = "Physical Review D",

issn = "2470-0010",

publisher = "American Physical Society",

number = "5",

}

TY - JOUR

T1 - Quarkonium h states as arbiters of exoticity

AU - Lebed, Richard

AU - Swanson, Eric S.

N1 - Funding Information: We gratefully acknowledge H. Lamm, R. E. Mitchell, and S. Olsen for their expert advice. This work was supported by the National Science Foundation under Grant No. PHY-1403891. Publisher Copyright: © 2017 American Physical Society.

PY - 2017/9/1

Y1 - 2017/9/1

N2 - The mass splitting between the quarkonium spin-singlet state h (JPC=1+-) and the spin average of the quarkonium spin-triplet states χ (JPC=0++,1++,2++) is seen to be astonishingly small, not only in the charmonium and bottomonium cases where the relevant masses have been measured, but in positronium as well. We find, both in nonrelativistic quark models and in nonrelativistic quantum chromodynamics (NRQCD), that this hyperfine splitting is so small that it can be used as a test of the pure QQ- content of the states. We discuss the 2P states of charmonium in the vicinity of 3.9 GeV, where the putative exotics X(3872) and X(3915) have been seen and a new χc0(2P) candidate has been observed at Belle.

AB - The mass splitting between the quarkonium spin-singlet state h (JPC=1+-) and the spin average of the quarkonium spin-triplet states χ (JPC=0++,1++,2++) is seen to be astonishingly small, not only in the charmonium and bottomonium cases where the relevant masses have been measured, but in positronium as well. We find, both in nonrelativistic quark models and in nonrelativistic quantum chromodynamics (NRQCD), that this hyperfine splitting is so small that it can be used as a test of the pure QQ- content of the states. We discuss the 2P states of charmonium in the vicinity of 3.9 GeV, where the putative exotics X(3872) and X(3915) have been seen and a new χc0(2P) candidate has been observed at Belle.

UR - http://www.scopus.com/inward/record.url?scp=85031107009&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85031107009&partnerID=8YFLogxK

U2 - 10.1103/PhysRevD.96.056015

DO - 10.1103/PhysRevD.96.056015

M3 - Article

AN - SCOPUS:85031107009

SN - 2470-0010

VL - 96

JO - Physical Review D

JF - Physical Review D

IS - 5

M1 - 056015

ER -

Quarkonium h states as arbiters of exoticity

Abstract

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Cite this