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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:0.1

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

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

Possibility of a new narrow $$Lambda^*$$ resonance near the $$Lambda eta$$ threshold

Tanida, Kiyoshi

AIP Conference Proceedings 2130, p.040019_1 - 040019_6, 2019/07

 Times Cited Count:2 Percentile:84.98

Journal Articles

Exotic and conventional quarkonium physics prospects at Belle II

Tanida, Kiyoshi

AIP Conference Proceedings 2130, p.040020_1 - 040020_6, 2019/07

 Times Cited Count:1 Percentile:65.18

Journal Articles

Gamma-ray spectroscopy of single $$Lambda$$-hypernuclei at J-PARC; Results and perspective

Koike, Takeshi*; Hasegawa, Shoichi; Hayakawa, Shuhei*; Hosomi, Kenji; Ichikawa, Yudai; Imai, Kenichi; Sako, Hiroyuki; Sato, Susumu; Sugimura, Hitoshi; Tamura, Hirokazu; et al.

AIP Conference Proceedings 2130, p.020011_1 - 020011_9, 2019/07

 Times Cited Count:1 Percentile:65.18

Journal Articles

Observation of a $$Xi$$ bound state in the $$^{12}$$C$$(K^-, K^+)$$ reaction at 1.8 GeV/$$c$$

Nagae, Tomofumi*; Ekawa, Hiroyuki; Hasegawa, Shoichi; Hayakawa, Shuhei; Hosomi, Kenji; Ichikawa, Yudai; Imai, Kenichi; Kimbara, Shinji; Nanamura, Takuya*; Naruki, Megumi; et al.

AIP Conference Proceedings 2130, p.020015_1 - 020015_9, 2019/07

Journal Articles

Spectroscopic study of the $$Lambda$$(1405) resonance via the $$d(K^-, n)$$ reaction at J-PARC

Asano, Hidemitsu*; Hashimoto, Tadashi; Tanida, Kiyoshi; 72 of others*

AIP Conference Proceedings 2130, p.040018_1 - 040018_6, 2019/07

 Times Cited Count:1 Percentile:65.18

Oral presentation

High-resolution spectroscopic study of the $$Xi$$-hypernuclei with S-2S spectrometer

Nanamura, Takuya; Ichikawa, Yudai; Nagae, Tomofumi*; Ekawa, Hiroyuki; Tanida, Kiyoshi

no journal, , 

Spectroscopic study of $$Xi$$-hypernuclei provides insights into the $$Xi$$-$$N$$ interaction and the $$Xi N to Lambda Lambda$$ coupling strength. A missing mass spectroscopy of the $$Xi$$-hypernuclei was performed via the $$^{12}$$C$$(K^-,K^+)$$ reaction at J-PARC K1.8 beam line in 2015. In this measurement, we have achieved the missing mass resolution 5.4 MeV (FWHM). It is important to achieve a better missing mass resolution. As the next step, we are constructing a new spectrometer S-2S (Strangeness -2 Spectrometer) for the $$K^+$$. In this condition, the total missing-mass resolution would be affected mainly due to the target energy loss straggling. To reduce energy loss straggling in the target, we are developing an active target composed of scintillating fibers. Construction of the magnets and most parts of detectors for S-2S has been completed. It will soon be ready for installation in J-PARC K1.8.

Oral presentation

$$K^{bar}$$ and nucleus system studied by $$^{12}$$C($$K^-$$, $$p$$) reaction

Ichikawa, Yudai; Sako, Hiroyuki; Sato, Susumu; Tanida, Kiyoshi; Hasegawa, Shoichi; Tamura, Hirokazu

no journal, , 

We have measured an inclusive missing-mass spectrum of the $$^{12}$$C$$(K^-, p)$$ reaction over wide energy region at the kaon incident momentum of 1.8 GeV/$$c$$ at J-PARC K1.8 beam line. We have compared the observed missing-mass spectrum with a DWIA calculation to study the $$bar{K}$$-nucleus interaction. In this comparison, we have changed the depth of both real and imaginary part of the optical potential between $$bar{K}$$ and nucleus. It is found that the observed spectrum is well reproduced by the calculation of the potential depth of $$V_0 sim -100$$ MeV (real part) and $$W_0 sim -40$$ MeV (imaginary part). On the other hand, we have observed the definitive excess in the deeply bound region $$B_{K} > 100$$ MeV, which cannot be explained by the any optical potential. This excess can be interpreted as a deeply bound $$Lambda(1405)$$ nucleus.

Oral presentation

Status of J-PARC E07; Systematic study of double strangeness nuclei with hybrid emulsion method

Yoshida, Junya

no journal, , 

J-PARC E07 is a unique experiment at J-PARC to investigate double strangeness nuclei with hybrid emulsion method. It was designed to obtain ten times more double strangeness nuclei than that obtained by previous experiments. Moreover, it aims the first measurement of X-ray from $${Xi}$$-atom by Germanium detector. Beam exposure of E07 and photographic development of emulsion sheets are successfully completed. Several double strangeness events are found through searching work. I will report the present status, analysis of detected events, and the prospect of the experiment.

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