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Journal Articles

Survival probabilities of charmonia as a clue to measure transient magnetic fields

Iwasaki, Sachio*; Jido, Daisuke*; Oka, Makoto; Suzuki, Kei

Physics Letters B, 820, p.136498_1 - 136498_6, 2021/09

 Times Cited Count:1 Percentile:19.67(Astronomy & Astrophysics)

We investigate time evolution of $$S$$-wave charmonium populations under a time-dependent homogeneous magnetic field and evaluate survival probabilities of the low-lying charmonia to the goal of estimating the magnetic field strength at heavy-ion collisions. Our approach implements mixing between different spin eigenstates and transitions to radially excited states. We show that the survival probabilities can change even by an extremely short magnetic field. Furthermore, we find that the survival probabilities depend on the initial spin states. We propose the sum of the survival probabilities over spin partners as an observable insensitive to the initial states. We also find that the sum can be approximately given as a function of $$sigma B_0^2$$ with a duration time $$sigma$$ and the maximum strength of the magnetic field $$B_0$$.

Journal Articles

A Review of quarkonia under strong magnetic fields

Iwasaki, Sachio*; Oka, Makoto; Suzuki, Kei

European Physical Journal A, 57(7), p.222_1 - 222_14, 2021/07

 Times Cited Count:13 Percentile:69.69(Physics, Nuclear)

We review the properties of quarkonia under strong magnetic fields. The main phenomena are (i) mixing between different spin eigenstates, (ii) quark Landau levels and deformation of wave function, (iii) modification of $$bar{Q}Q$$ potential, and (iv) the motional Stark effect. For theoretical approaches, we review (i) constituent quark models, (ii) effective Lagrangians, (iii) QCD sum rules, and (iv) holographic approaches.

Journal Articles

Hadronic Paschen-Back effect in charmonium

Iwasaki, Sachio; Oka, Makoto; Suzuki, Kei*; Yoshida, Tetsuya*

AIP Conference Proceedings 2130, p.050001_1 - 050001_8, 2019/07

 Times Cited Count:0 Percentile:0.09

We find a novel phenomenon induced by the interplay between a strong magnetic field and finite orbital angular momenta in hadronic systems, which is analogous to the Paschen-Back effect observed in the field of atomic physics. This effect allows the wave functions to drastically deform. We discuss anisotropic decay from the deformation as a possibility to measure the strength of the magnetic field in heavy-ion collision at LHC, RHIC and SPS, which has not experimentally been measured. As an example we investigate charmonia with finite orbital angular momentum in a strong magnetic field. We calculate the mass spectra and mixing rate. To obtain anisotropic wave functions, we apply the cylindrical Gaussian expansion method, where the Gaussian bases to expand the wave functions have different widths along transverse and longitudinal directions in the cylindrical coordinate.

Journal Articles

Hadronic Paschen-Back effect in P-wave charmonia under strong magnetic fields

Iwasaki, Sachio; Oka, Makoto; Suzuki, Kei*; Yoshida, Tetsuya*

International Journal of Modern Physics; Conference Series (Internet), 49, p.1960002_1 - 1960002_6, 2019/07

 Times Cited Count:0 Percentile:0.09

The hadronic Paschen-Back effects in P-wave charmonia are analyzed using the constituent quark models in strong magnetic field.

Journal Articles

Hadronic Paschen-Back effect

Iwasaki, Sachio; Oka, Makoto; Suzuki, Kei*; Yoshida, Tetsuya*

Physics Letters B, 790, p.71 - 76, 2019/03

 Times Cited Count:9 Percentile:72.35(Astronomy & Astrophysics)

We find a novel phenomenon induced by the interplay between a strong magnetic field and finite orbital angular momenta in hadronic systems, which is analogous to the Paschen-Back effect observed in the field of atomic physics. This effect allows the wave functions to drastically deform. We discuss anisotropic decay from the deformation as a possibility to measure the strength of the magnetic field in heavy-ion collision at LHC, RHIC and SPS, which has not experimentally been measured. As an example we investigate charmonia with finite orbital angular momentum in a strong magnetic field. We calculate the mass spectra and mixing rate. To obtain anisotropic wave functions, we apply the cylindrical Gaussian expansion method, where the Gaussian bases to expand the wave functions have different widths along transverse and longitudinal directions in the cylindrical coordinate.

Journal Articles

Quarkonium radiative decays from the Hadronic Paschen-Back effect

Iwasaki, Sachio; Suzuki, Kei*

Physical Review D, 98(5), p.054017_1 - 054017_11, 2018/09

 Times Cited Count:8 Percentile:45.48(Astronomy & Astrophysics)

Oral presentation

The Anisotropy of the radiative decay of quarkonia in a strong magnetic field

Iwasaki, Sachio; Suzuki, Kei*

no journal, , 

The quantum chromodynamics, QCD, in a strong magnetic field is rigorously investigated these days, relating to the relativistic heavy ion collision experiment and strong-magnetized neutron star. The property of the hadrons in such environment is the important research subject from the point of view of comprehending QCD in a strong magnetic field and suggest in a experimental probe of the magnetic field. In this talk, we discuss the anisotropy of radiative decay of the P-wave quarkonium in a strong magnetic field based on the Lagrangian of potential non-relativistic QCD, which is an effective field theory to describe quarkonium systems. Though we assume the wave function of the eigenstates of quarkonium in vacuum on the conventional formalism, we can not use them because they mix in a magnetic field. In this study, we derive the analytic formulas of the radiative decay width in a strong magnetic field up to its leading order by introducing the polarized wave functions appearing in the limit of strong magnetic field.

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