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Gubler, Philipp,Hattori, Koichi,Lee, Su Houng,Oka, Makoto,Ozaki, Sho,Suzuki, Kei American Physical Society 2016 Physical review. D Vol.93 No.5
<P>We investigate the mass spectra of open heavy flavor mesons in an external constant magnetic field within QCD sum rules. Spectral Ansatze on the phenomenological side are proposed in order to properly take into account mixing effects between the pseudoscalar and vector channels, and the Landau levels of charged mesons. The operator product expansion is implemented up to dimension-5 operators. As a result, we find for neutral D mesons a significant positive mass shift that goes beyond simple mixing effects. In contrast, charged D mesons are further subject to Landau level effects, which together with the mixing effects almost completely saturate the mass shifts obtained in our sum rule analysis.</P>
A novel probe of chiral restoration in nuclear medium
Gubler, Philipp,Kunihiro, Teiji,Lee, Su Houng Elsevier 2017 Physics letters: B Vol.767 No.-
<P><B>Abstract</B></P> <P>We propose measuring the mass shift and width broadening of the <SUB> f 1 </SUB> ( 1285 ) meson together with those of the <I>ω</I> from a nuclear target as a means to experimentally probe the partial restoration of chiral symmetry inside the nuclear matter. The relation between the order parameter of chiral symmetry and the difference in the correlation functions of the <SUB> f 1 </SUB> ( 1285 ) current and the <I>ω</I> current is discussed in the limit where the disconnected diagrams are neglected. A QCD sum rule analysis of the <SUB> f 1 </SUB> ( 1285 ) meson mass leads to about 100 MeV attraction in nuclear matter, which can be probed in future experiments.</P>
Light vector correlator in medium: Wilson coefficients up to dimension 6 operators
Kim, H.,Gubler, P.,Lee, S.H. Elsevier 2017 Physics letters: B Vol.772 No.-
As an improvement of the QCD sum rule method to study modifications of light vector mesons in nuclear matter and/or at finite temperature, we calculate the Wilson coefficients of all independent gluonic non-scalar operators up to dimension 6 in the operator product expansion (OPE) of the vector channel for light quarks. To obtain the gluon part of the light quark OPE from the heavy quark one, we also compute the heavy quark expansion of the relevant quark condensates. Together with the results for the quark operators that are already available in the literature, this completes the OPE of the vector channel in a hot or dense medium for operators up to dimension 6.
Mass of heavy-light mesons in a constituent quark picture with partially restored chiral symmetry
Park, Aaron,Gubler, Philipp,Harada, Masayasu,Lee, Su Houng,Nonaka, Chiho,Park, Woosung American Physical Society 2016 Physical review. D Vol.93 No.5
<P>We probe effects of the partial chiral symmetry restoration to the mass of heavy-light mesons in a constituent quark model by changing the constituent quark mass of the light quark. Due to the competing effect between the quark mass and the linearly rising potential, whose contribution to the energy increases as the quark mass decreases, the heavy-light meson mass has a minimum value near the constituent quark mass typically used in the vacuum. Hence, the meson mass increases as one decreases the constituent quark mass consistent with recent QCD sum rule analyses, which show an increasing D meson mass as the chiral order parameter decreases.</P>