Charmonium spectroscopy in strong magnetic fields by QCD sum rules: S -wave ground states

Sungtae Cho, Koichi Hattori, Su Houng Lee, Kenji Morita, Sho Ozaki

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

We investigate quarkonium mass spectra in external constant magnetic fields by using QCD sum rules. We first discuss a general framework of QCD sum rules necessary for properly extracting meson spectra from current correlators computed in the presence of strong magnetic fields, that is, a consistent treatment of mixing effects caused in the mesonic degrees of freedom. We then implement operator product expansions for pseudoscalar and vector heavy-quark current correlators by taking into account external constant magnetic fields as operators and obtain mass shifts of the lowest-lying bound states ηc and J/ψ in the static limit with their vanishing spatial momenta. Comparing results from QCD sum rules with those from hadronic effective theories, we find that the dominant origin of mass shifts comes from a mixing between ηc and J/ψ with a longitudinal spin polarization, accompanied by other subdominant effects such as mixing with higher excited states and continua.

Original languageEnglish
Article number045025
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume91
Issue number4
DOIs
Publication statusPublished - 2015 Feb 19

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sum rules
S waves
quantum chromodynamics
correlators
ground state
magnetic fields
spectroscopy
operators
shift
mass spectra
mesons
degrees of freedom
quarks
continuums
momentum
expansion
polarization
products
excitation

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)

Cite this

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abstract = "We investigate quarkonium mass spectra in external constant magnetic fields by using QCD sum rules. We first discuss a general framework of QCD sum rules necessary for properly extracting meson spectra from current correlators computed in the presence of strong magnetic fields, that is, a consistent treatment of mixing effects caused in the mesonic degrees of freedom. We then implement operator product expansions for pseudoscalar and vector heavy-quark current correlators by taking into account external constant magnetic fields as operators and obtain mass shifts of the lowest-lying bound states ηc and J/ψ in the static limit with their vanishing spatial momenta. Comparing results from QCD sum rules with those from hadronic effective theories, we find that the dominant origin of mass shifts comes from a mixing between ηc and J/ψ with a longitudinal spin polarization, accompanied by other subdominant effects such as mixing with higher excited states and continua.",
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Charmonium spectroscopy in strong magnetic fields by QCD sum rules : S -wave ground states. / Cho, Sungtae; Hattori, Koichi; Lee, Su Houng; Morita, Kenji; Ozaki, Sho.

In: Physical Review D - Particles, Fields, Gravitation and Cosmology, Vol. 91, No. 4, 045025, 19.02.2015.

Research output: Contribution to journalArticle

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AU - Cho, Sungtae

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AU - Ozaki, Sho

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