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Journal Articles

The Negative-parity spin-1/2 $$Lambda$$ baryon spectrum from lattice QCD and effective theory

Pavao, R.*; Gubler, P.; Fernandez-Soler, P.*; Nieves, J.*; Oka, Makoto; Takahashi, Toru*

Physics Letters B, 820, p.136473_1 - 136473_8, 2021/09

Journal Articles

Stable double-heavy tetraquarks; Spectrum and structure

Meng, Q.*; Hiyama, Emiko*; Hosaka, Atsushi; Oka, Makoto; Gubler, P.; Can, K. U.*; Takahashi, Toru*; Zong, H. S.*

Physics Letters B, 814, p.136095_1 - 136095_6, 2021/03

 Times Cited Count:2 Percentile:90.09(Astronomy & Astrophysics)

Journal Articles

J/$$psi$$ near $$T_c$$

Song, T.*; Gubler, P.; Hong, J.*; Lee, S. H.*; Morita, Kenji*

Physics Letters B, 813, p.136065_1 - 136065_5, 2021/02

 Times Cited Count:1 Percentile:74.98(Astronomy & Astrophysics)

Journal Articles

The $$phi$$ meson in nuclear matter with zero and non-zero momentum; Recent results

Gubler, P.

Journal of Physics; Conference Series, 1643, p.012009_1 - 012009_6, 2020/12

 Times Cited Count:0 Percentile:0.12

Based on my recent research, I will discuss the behavior of the $$phi$$ meson in nuclear matter. I will especially focus on the effect of momentum on the modification of the $$phi$$ in nuclear matter. Furthermore, if time allows, I will also briefly touch on my recent simulation of pA reactions (p: proton, A: nucleus), which are used to study the $$phi$$ in nuclear matter experimentally.

Journal Articles

Charmed baryon spectrum from lattice QCD near the physical point

Bahtiyar, H.*; Can, K. U.*; Erkol, G.*; Gubler, P.; Oka, Makoto; Takahashi, Toru*

Physical Review D, 102(5), p.054513_1 - 054513_18, 2020/09

 Times Cited Count:10 Percentile:88.2(Astronomy & Astrophysics)

Spectrum of the ground state and excited states of charmed baryons was evaluated in the lattice QCD, the first principle of hadronic interaction. We deliver the spectrum of the positive and negative parity baryons with one, two or three charmed quarks. A variational approach was employed by the use of multiple operators with different Dirac matrix configurations and the smearings.

Journal Articles

Signatures of the vortical quark-gluon plasma in hadron yields

Taya, Hidetoshi*; Park, A.*; Cho, S.*; Gubler, P.; Hattori, Koichi*; Hong, J.*; Huang, X.-G.*; Lee, S. H.*; Monnai, Akihiko*; Onishi, Akira*; et al.

Physical Review C, 102(2), p.021901_1 - 021901_6, 2020/08

 Times Cited Count:2 Percentile:57.67(Physics, Nuclear)

Journal Articles

Simulating pA reactions to study the $$phi$$ meson in nuclear matter at J-PARC

Gubler, P.

AIP Conference Proceedings 2249, p.030002_1 - 030002_7, 2020/07

 Times Cited Count:0 Percentile:0.09

Based on my recent research, I will present results on numerical simulations of pA reactions (p: proton, A: nucleus). I will specially explain in detail the experimentally measurable di-lepton spectrum that results from this sort of reaction. Furthermore, I will discuss what kind of $$phi$$ meson spectral function best reproduces the experimental results obtained so far.

Journal Articles

$$D$$ meson mass and heavy quark potential at finite temperature

Gubler, P.; Song, T.*; Lee, S. H.*

Physical Review D, 101(11), p.114029_1 - 114029_10, 2020/06

 Times Cited Count:3 Percentile:53.9(Astronomy & Astrophysics)

Journal Articles

The $$phi$$ meson with finite momentum in a dense medium

Kim, H.-J.*; Gubler, P.

Physics Letters B, 805, p.135412_1 - 135412_8, 2020/06

 Times Cited Count:4 Percentile:79.36(Astronomy & Astrophysics)

The dispersion relation of the $$phi$$ meson in nuclear matter is studied in a QCD sum rule approach. In a dense medium, longitudinal and transverse modes of vector particles can have independently modified dispersion relations due to broken Lorentz invariance. Employing the full set of independent operators and corresponding Wilson coefficients up to operator dimension-6, the $$phi$$ meson QCD sum rules are analyzed with changing densities and momenta. The non-trivial momentum dependence of the $$phi$$ meson mass is found to have opposite signs for the longitudinal and transverse modes. Specifically, the mass is reduced by 5 MeV for the longitudinal mode, while its increase amounts to 7 MeV for the transverse mode, both at a momentum scale of 1 GeV. In an experiment which does not distinguish between longitudinal and transverse polarizations, this could in principle be seen as two separated peaks at large momenta.

Journal Articles

Exact vector channel sum rules at finite temperature

Gubler, P.; Sato, Daisuke*

JPS Conference Proceedings (Internet), 26, p.024023_1 - 024023_5, 2019/11

In this talk, I will introduce and review several exact sum rules of the vector channel spectral function at finite temperature, which we have derived in a recent paper. I will also discuss an explicit check of these sum rules in perturbation theory and possible application to the analysis of lattice QCD data.

Journal Articles

Spectrum of the charmed baryons in 2+1-flavor lattice QCD

Can, K. U.*; Bahtiyar, H.*; Erkol, G.*; Gubler, P.; Oka, Makoto; Takahashi, Toru*

JPS Conference Proceedings (Internet), 26, p.022028_1 - 022028_5, 2019/11

Spectrum of the ground state and excited states of charmed baryons was evaluated in the lattice QCD, the first principle.

Journal Articles

Compact $$ssscbar c$$ pentaquark states predicted by a quark model

Meng, Q.*; Hiyama, Emiko*; Can, K. U.*; Gubler, P.; Oka, Makoto; Hosaka, Atsushi; Zong, H.*

Physics Letters B, 798, p.135028_1 - 135028_8, 2019/11

 Times Cited Count:0

Journal Articles

Compact $$ssscbar{c}$$ pentaquark states predicted by a quark model

Meng, Q.*; Hiyama, Emiko; Can, K. U.*; Gubler, P.; Oka, Makoto; Hosaka, Atsushi; Zong, H.*

Physics Letters B, 798, p.135028_1 - 135028_8, 2019/11

AA2019-0487.pdf:1.01MB

 Times Cited Count:7 Percentile:80.58(Astronomy & Astrophysics)

Journal Articles

Towards understanding the $$phi$$ meson in nuclear matter with finite momentum

Gubler, P.

Proceedings of Science (Internet), 336, 7 Pages, 2019/09

In this talk, results about the behavior of the $$phi$$ meson with non-zero momentum in nuclear matter will be presented and an outlook will be made on future theoretical and experimental developments related to this topic. Our findings are relevant for future experiments (such as E16) to be carried out at the J-PARC facility.

Journal Articles

Mesons with charm and strangeness in nuclear matter

Gubler, P.

AIP Conference Proceedings 2130, p.040015_1 - 040015_8, 2019/07

 Times Cited Count:0 Percentile:0.1

In this talk, results about the behavior of mesons containing strange and charm quarks in nuclear matter will be presented and an outlook will be made on future theoretical and experimental developments related to this topic. Our findings are relevant for future experiments (such as E16) to be carried out at the J-PARC facility.

Journal Articles

Recent progress in QCD condensate evaluations and sum rules

Gubler, P.; Sato, Daisuke*

Progress in Particle and Nuclear Physics, 106, p.1 - 67, 2019/05

AA2019-0104.pdf:1.35MB

 Times Cited Count:30 Percentile:92.89(Physics, Nuclear)

We review the recent status of the QCD sum rule approach to study the properties of hadrons in vacuum and in hot or dense matter. Special focus is laid on the progress made in the evaluation of the QCD condensates, which are the input of all QCD sum rule calculations, and for which much new information has become available through high precision lattice QCD calculations, chiral perturbation theory and experimental measurements. Furthermore, we critically examine common analysis methods for QCD sum rules and contrast them with potential alternative strategies. The status of QCD sum rule studies investigating the modification of hadrons at finite density as well as recent derivations of exact sum rules applicable to finite temperature spectral functions, are also reviewed.

Journal Articles

Numerical analytic continuation of Euclidean data

Tripolt, R.-A.*; Gubler, P.; Ulybyshev, M.*; von Smekal, L.*

Computer Physics Communications, 237, p.129 - 142, 2019/04

 Times Cited Count:29 Percentile:98.32(Computer Science, Interdisciplinary Applications)

In this work we present a direct comparison of three different numerical analytic continuation methods: the Maximum Entropy Method, the Backus-Gilbert method and the Schlessinger point or Resonances Via Pade method. First, we perform a benchmark test based on a model spectral function and study the regime of applicability of these methods depending on the number of input points and their statistical error. We then apply these methods to more realistic examples, namely to numerical data on Euclidean propagators obtained from a Functional Renormalization Group calculation, to data from a lattice Quantum Chromodynamics simulation and to data obtained from a tight-binding model for graphene in order to extract the electrical conductivity.

Journal Articles

Charmonium ground and excited states at finite temperature from complex Borel sum rules

Araki, Kenji*; Suzuki, Kei*; Gubler, P.; Oka, Makoto

Physics Letters B, 780, p.48 - 53, 2018/05

 Times Cited Count:3 Percentile:40.34(Astronomy & Astrophysics)

Charmonium spectral functions in vector and pseudoscalar channels at finite temperature are investigated through the complex Borel sum rules and the maximum entropy method. Our approach enables us to extract the peaks corresponding to the excited charmonia, as well as those of the ground states, which has never been achieved in usual QCD sum rule analyses. We show the spectral functions in vacuum and their thermal modification around the critical temperature, which leads to the almost simultaneous melting (or peak disappearance) of the ground and excited states.

Journal Articles

Finite temperature sum rules in the vector channel at finite momentum

Gubler, P.; Sato, Daisuke*

Physical Review D, 96(11), p.114028_1 - 114028_20, 2017/12

 Times Cited Count:5 Percentile:36.66(Astronomy & Astrophysics)

Exact sum rules for the longitudinal and transverse part of the vector channel spectral functions at nonzero momentum are derived in the first part of the paper. The sum rules are formulated for the finite temperature spectral functions, from which the vacuum component has been subtracted, and represent a generalization of previous work in which sum rules were derived only for the zero-momentum limit. In the second part of the paper, we demonstrate how the sum rules can be used as constraints in spectral fits to lattice data at various temperatures, with the latest dynamical lattice quantum chromodynamics data at zero momentum.

Journal Articles

Flavor structure of $$Lambda$$ baryons from lattice QCD; From strange to charm quarks

Gubler, P.*; Takahashi, Toru*; Oka, Makoto

Physical Review D, 94(11), p.114518_1 - 114518_16, 2016/12

 Times Cited Count:4 Percentile:28.23(Astronomy & Astrophysics)

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