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1. J-PARC hadron experimental facility extension project

Author

Sakuma Fuminori, Aoki Kazuya, Fujioka Hiroyuki, Gogami Toshiyuki, Hidaka Yoshimasa, Hiyama Emiko, Honda Ryotaro, Hosaka Atsushi, Ichikawa Yudai, Ieiri Masaharu, Isaka Masahiro, Ishii Noriyoshi, Ishikawa Takatsugu, Komatsu Yusuke, Komatsubara Takeshi, Lim GeiYoub, Miwa Koji, Morino Yuhei, Nagae Tomofumi, Nagao Sho, Nakamura Satoshi N., Nanjo Hajime, Naruki Megumi, Nemura Hidekatsu, Nomura Tadashi, Noumi Hiroyuki, Ohnishi Hiroaki, Ozawa Kyoichiro, Sawada Shinya, Sekihara Takayasu, Shim Sang-In, Shiomi Koji, Shirotori Kotaro, Tajima Yasuhisa, Takahashi Hitoshi, Takahashi Toshiyuki, Takeuchi Sachiko, Takizawa Makoto, Tamura Hirokazu, Tanida Kiyoshi, Ukai Mifuyu, Yamamoto Takeshi O., and Yamamoto Yasuo

Subjects
Physics, QC1-999
Abstract

The J-PARC Hadron Experimental Facility was constructed with an aim to explore the origin and evolution of matter in the universe through experiments with intense particle beams. In the past decade, many results from particle and nuclear physics experiments have been obtained at the present facility. To expand the physics programs to as yet unexplored regions, the extension project of the Hadron Experimental Facility has been extensively discussed. This contribution presents the physics of the extension of the Hadron Experimental Facility to resolve issues related to strangeness nuclear physics, hadron physics, and flavor physics.

Published
2022
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2. Λ polarization measurement of the π−p → K0Λ reaction in J-PARC E40 experiment

Author

Sakao Tamao, Honda Ryotaro, Miwa Koji, Nakada Yoshiyuki, Nanamura Takuya, Takahashi Toshiyuki, Ukai Mifuyu, and Yamamoto Takeshi

Subjects
Physics, QC1-999
Abstract

We performed the J-PARC E40 experiment to measure the Σp scattering cross sections from 2018 to 2020. Together with the π−p → K+Σ− data, the π−p → K0Λ data were accumulated as a byproduct. The analysis confirmed that Λ could be identified with an S/N ratio of ∼ 2.67. The polarization of Λ(PΛ) was preliminarily derived as 1.009 ± 0.049 for the K0 angular range of 0.7 < cos θK0, CM < 0.8. It is more accurate than the past data [1]. The high polarization enables us to measure not only the differential cross section but also spin observables of the Λp scattering in the future J-PARC experiment.

Published
2022
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3. Results of analysis of Σ+p scattering events in J-PARC E40 experiment: differential cross sections and phase shifts of 3S1 and 1P1 states

Author

Nanamura Takuya, Miwa Koji, Hayakawa Shuhei H., Honda Ryotaro, Nakada Yoshiyuki, Takahashi Toshiyuki, Ukai Mifuyu, and Yamamoto Takeshi O.

Subjects
Physics, QC1-999
Abstract

We performed a novel Σ+p scattering experiment at the J-PARC Hadron Experimental Facility. Approximately 2400 Σ+p scattering events were identified by a kinematical consistency check for the recoil proton. The differential cross sections of the Σ+p elastic scattering were derived with better precision than in previous experiments. By exploiting high-quality differential cross section data and the simple representation of Σ+p interaction in the SU(3) flavor symmetry, we performed a phase-shift analysis on hyperon-nucleon scattering data for the first time. The absolute value of the phase shift of the 3S1 channel, where a large repulsive force was predicted due to the Pauli exclusive effect between quarks, was evaluated. These results indicate that the interaction of the 3S1 channel in the Σ+p channel is moderately repulsive, as the Nijmegen extended-soft-core models predicted.

Published
2022
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4. Strangeness physics programs by S-2S at J-PARC

Author

Gogami Toshiyuki, Achenbach Patrick, Ahn Jung Keun, Androić Darko, Aoki Kanae, Asaturyan Arshak, Botta Elena, Bukhari Masroor. H., Camsonne Alexandre, Covrig Silviu. C., Ebata Kengo, Ekawa Hiroyuki, Evtoukhovitch Petr, Feliciello Alessandro, Fujioka Hiroyuki, Fujita Manami, Garibaldi Franco, Harada Takeshi. K., Hasegawa Shoichi, Hasegawa Tomoyuki, Hayakawa Shuhei. H., Hirose Erina, Honda Ryotaro, Hosomi Kenji, Ichikawa Yudai, Imai Kenichi, Ishige Tatsuhiro, Jung Wooseung, Kamada Kento, Kanatsuki Shunsuke, Kato Seigo, Kim Shinhyung. H., Kobori Takumi, Marcello Simonetta, Markowitz Pete, Miwa Koji, Mkrtchyan Arthur, Mkrtchyan Hamlet, Moritsu Manabu, Nagae Tomofumi, Nagao Sho, Nakagawa Manami, Nakamura Satoshi. N., Nanamura Takuya, Naruki Megumi, Negishi Ryosuke, Okuyama Kazuki, Oura Fumiya, Pandey Bishnu, Pochodzalla Josef, Sakaguchi Atsushi, Sakao Tamao, Sako Hiroyuki, Samanta Chhanda, Sato Susumu, Shabestari Mitra. H., Shahinyan Albert, Shirotori Kotaro, Širca Simon, Son C., Sugimura Hitoshi, Takahashi Hitoshi, Takahashi Shuji, Takahashi Tomonori, Takahashi Toshiyuki, Tamura Hirokazu, Tanida Kiyoshi, Tokiyasu Atsushi, Tsamalaidze Zviadi, Uchida Makoto, Ukai Mifuyu, Une Chiaki, Urciuoli Guido. M., and Yamamoto Takeshi. O.

Subjects
Physics, QC1-999
Abstract

In the K1.8 beam-line at Hadron Experimental Facility of J-PARC, a new magnetic spectrometer S-2S is being installed. S-2S was designed to achieve a high momentum resolution of Δp/p = 6 × 10−4 in FWHM. Several strangeness-physics programs which require the high resolution will be realized by S-2S. The present article introduces J-PARC E70 (missing-mass spectroscopy of Ξ12Be) and E94 (missing-mass spectroscopy of Λ7Li, Λ10B, and Λ12C) experiments.

Published
2022
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5. Experimental investigation of vector mesons in medium through dielectron decay at J-PARC

Author

Aoki, Kazuya, Ashikaga, Sakiko, Chang, Wen-Chen, Chujo, Tatsuya, Ejima, Ren, En’yo, Hideto, Esumi, Shinichi, Rodriguez Garces, Dairon, Hamagaki, Hideki, Heuser, Johann M., Honda, Ryotaro, Ichikawa, Masaya, Ishii, Daichi, Kajikawa, Shunsuke, Kakunaga, Jo, Kanno, Koki, Kiyomichi, Akio, Hori, Yusuke, Lin, Chih-Hsun, Morino, Yuhei, Murakami, Tomoki N., Muto, Ryotaro, Nagafusa, Shunnosuke, Nakai, Wataru, Nakasuga, Satomi, Naruki, Megumi, Nonaka, Toshihiro, Noumi, Hiroyuki, Ochiai, Shuta, Ogura, Makoto, Ozawa, Kyoichiro, Rodriguez Rodriguez, Adrian, Sakaguchi, Takao, Sako, Hiroyuki, Sakuma, Fuminori, Sato, Susumu, Sawada, Shinya, Sekimoto, Michiko, Shigaki, Kenta, Shirotori, Kotaro, Sugimura, Hitoshi, Takahashi, Tomonori N., Taniguchi, Tomohiro, Teklishyn, Maksym, Toia, Alberica, Yamada, Rento, Yamaguchi, Kanako H., Yamaguchi, Yorito L., Yanai, Shogo, and Yokkaichi, Satoshi

Published
2025
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6. Extension of the J-PARC Hadron Experimental Facility: Third White Paper

Author

Aoki, Kazuya, Fujioka, Hiroyuki, Gogami, Toshiyuki, Hidaka, Yoshimasa, Hiyama, Emiko, Honda, Ryotaro, Hosaka, Atsushi, Ichikawa, Yudai, Ieiri, Masaharu, Isaka, Masahiro, Ishii, Noriyoshi, Ishikawa, Takatsugu, Komatsu, Yusuke, Komatsubara, Takeshi, Lim, GeiYoub, Miwa, Koji, Morino, Yuhei, Nagae, Tomofumi, Nagao, Sho, Nakamura, Satoshi N., Nanjo, Hajime, Naruki, Megumi, Nemura, Hidekatsu, Nomura, Tadashi, Noumi, Hiroyuki, Ohnishi, Hiroaki, Ozawa, Kyoichiro, Sakuma, Fuminori, Sawada, Shinya, Sekihara, Takayasu, Shim, Sang-In, Shiomi, Koji, Shirotori, Kotaro, Tajima, Yasuhisa, Takahashi, Hitoshi, Takahashi, Toshiyuki, Takeuchi, Sachiko, Takizawa, Makoto, Tamura, Hirokazu, Tanida, Kiyoshi, Ukai, Mifuyu, Yamamoto, Takeshi O., and Yamamoto, Yasuo

Subjects
Nuclear Experiment, High Energy Physics - Experiment, Nuclear Theory, Physics - Instrumentation and Detectors
Abstract

The J-PARC Hadron Experimental Facility was constructed with an aim to explore the origin and evolution of matter in the universe through the experiments with intense particle beams. In the past decade, many results on particle and nuclear physics have been obtained at the present facility. To expand the physics programs to unexplored regions never achieved, the extension project of the Hadron Experimental Facility has been extensively discussed. This white paper presents the physics of the extension of the Hadron Experimental Facility for resolving the issues in the fields of the strangeness nuclear physics, hadron physics, and flavor physics., Comment: 261 pages, 186 figures

Published
2021

7. Data acquisition system in Run-0a for the J-PARC E16 experiment

Author

Takahashi, Tomonori, Aoki, Kazuya, Ashikaga, Sakiko, Chang, Wen-Chen, Hamada, Eitaro, Honda, Ryotaro, Ichikawa, Masaya, Ikeno, Masahiro, Kajikawa, Shunsuke, Kanno, Koki, Kawama, Daisuke, Kondo, Takehito, Lin, Che-Sheng, Lin, Chih-Hsun, Morino, Yuhei, Murakami, Tomoki, Nakai, Wataru, Nakasuga, Satomi, Naruki, Megumi, Obara, Yuki, Ozawa, Kyoichiro, Sako, Hiroyuki, Sato, Susumu, Sendai, Hiroshi, Suzuki, Kazuki, Takaura, Yudai, Tanaka, Manobu, Uchida, Tomohisa, and Yokkaichi, Satoshi

Subjects
Physics - Instrumentation and Detectors
Abstract

J-PARC E16 is an experiment to examine the origin of hadron mass through a systematic measurement of spectral changes of vector mesons in nuclei. The measurement of $e^{+}e^{-}$ pairs from the decay of vector mesons will provide the information of the partial restoration of the chiral symmetry in a normal nuclear density. To resolve a pulse pile-up and achieve good discrimination of $e^{\pm}$ from the background of a reaction rate of an order of 10 MHz, the data acquisition (DAQ) system uses waveform sampling chips of APV25 and DRS4. The trigger rate and data rate are expected to be 1 kHz and 130--330 MiB/s, respectively. The DAQ system for readout of APV25 and DRS4 were developed, where events were synchronized by common trigger and tag data. The first commissioning in beam, called Run-0a, was performed in June 2020 with about 1/4 of the designed setup. The DAQ worked with a trigger rate of 300 Hz in the Run-0a and the main bottleneck was a large data size of APV25. Further optimization of the DAQ system will improve the performance., Comment: IEEE Real Time 2020 Conference, 4 pages, 6 figures

Published
2020

8. Experimental Study of In-medium Spectral Change of Vector Mesons at J-PARC

Author

Aoki, Kazuya, Arimizu, Daichi, Ashikaga, Sakiko, Chang, Wen-Chen, Chujo, Tatsuya, Ebata, Kengo, En’yo, Hideto, Esumi, Shinichi, Hamagaki, Hideki, Honda, Ryotaro, Ichikawa, Masaya, Kajikawa, Shunsuke, Kanno, Koki, Kimura, Yuta, Kiyomichi, Akio, Kondo, Takehito K., Kyan, Shono, Lin, Che-Sheng, Lin, Chih-Hsun, Morino, Yuhei, Murakami, Hikari, Murakami, Tomoki N., Muto, Ryotaro, Nagafusa, Shunnosuke, Nakai, Wataru, Nakasuga, Satomi, Naruki, Megumi, Nonaka, Toshihiro, Noumi, Hiroyuki, Ochiai, Shuta, Ozawa, Kyoichiro, Sakaguchi, Takao, Sako, Hiroyuki, Sakuma, Fuminori, Sato, Susumu, Sawada, Shinya, Sekimoto, Michiko, Shigaki, Kenta, Shirotori, Kotaro, Sugimura, Hitoshi, Takahashi, Tomonori N., Takaura, Yudai, Tatsumi, Ryohei, Tsukui, Kosuke, Wang, Po-Hung, Yahiro, Kanta, Yamaguchi, Kanako H., and Yokkaichi, Satoshi

Published
2023
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9. Commissioning of the electron identification system for Dilepton measurement in pA collisions at J-PARC

Author

Nakasuga, Satomi, Aoki, Kazuya, Aramaki, Yoki, Arimizu, Daichi, Ashikaga, Sakiko, Ebata, Kengo, Honda, Ryotaro, Ichikawa, Masaya, Kajikawa, Shunsuke, Kanno, Koki, Kimura, Yuta, Kondo, Takehito, Kyan, Shono, Morino, Yuhei, Murakami, Hikari, Murakami, Tomoki, Nakai, Wataru, Naruki, Megumi, Nonaka, Toshihiro, Noumi, Hiroyuki, Ogata, Naoki, Ozawa, Kyoichiro, Sako, Hiroyuki, Sato, Susumu, Sekimoto, Michiko, Shirotori, Kotaro, Takahashi, Tomonori, Takaura, Yudai, Tatsumi, Ryohei, Tsukui, Kosuke, Yahiro, Kanta, and Yokkaichi, Satoshi

Published
2022
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10. Repulsion and absorption of the $\Sigma$-nucleus potential for $\Sigma^-$-$^5$He in the $^6$Li($\pi^-$, $K^+$) reaction

Author

Harada, Toru, Honda, Ryotaro, and Hirabayashi, Yoshiharu

Subjects
Nuclear Theory
Abstract

We study phenomenologically inclusive spectra of the $^6$Li($\pi^-$, $K^+$) reaction at 1.2 GeV/$c$ within a distorted-wave impulse approximation with the optimal Fermi-averaging $\pi^- p \to K^+ \Sigma^-$ $t$ matrix. We attempt to clarify the property of a $\Sigma$-nucleus potential for $\Sigma^-$-$^5$He by comparing the calculated spectra with the data of the J-PARC E10 experiment. The result shows that the repulsive and absorptive components of the $\Sigma^-$-$^5$He potential provide the ability to explain the data of the continuum spectra in $\Sigma$ and $\Lambda$ regions; the strengths of $V_\Sigma \simeq$ +30 MeV and $W_\Sigma \simeq$ $-$26 MeV are favored within the Woods-Saxon potential, consistent with analyses for heavier nuclei. Effects of the size and potential range for $\Sigma^-$-$^5$He in the neutron excess of $(N-Z)/(N+Z)=$ 0.2 are also discussed., Comment: 35 pages, 11 figures

Published
2017
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11. Observation of the '$K^-pp$'-like structure in the $d(\pi^+, K^+)$ reaction at 1.69 GeV/$c$

Author

Ichikawa, Yudai, Nagae, Tomofumi, Fujioka, Hiroyuki, Bhang, Hyoungchan, Bufalino, Stefania, Ekawa, Hiroyuki, Evtoukhovitch, Petr, Feliciello, Alessandro, Hasegawa, Shoichi, Hayakawa, Shuhei, Honda, Ryotaro, Hosomi, Kenji, Imai, Kenichi, Ishimoto, Shigeru, Joo, Changwoo, Kanatsuki, Shunsuke, Kiuchi, Ryuta, Koike, Takeshi, Kumawat, Harphool, Matsumoto, Yuki, Miwa, Koji, Moritsu, Manabu, Naruki, Megumi, Niiyama, Masayuki, Nozawa, Yuki, Ota, Ryosuke, Sakaguchi, Atsushi, Sako, Hiroyuki, Samoilov, Valentin, Sato, Susumu, Shirotori, Kotaro, Sugimura, Hitoshi, Suzuki, Shoji, Takahashi, Toshiyuki, Takahashi, Tomonori, Tamura, Hirokazu, Tanaka, Toshiyuki, Tanida, Kiyoshi, Tokiyasu, Atsushi, Tsamalaidze, Zviadi, Roy, Bidyut, Ukai, Mifuyu, Yamamoto, Takeshi, and Yang, Seongbae

Subjects
Nuclear Experiment
Abstract

We have observed a "$K^-pp$"-like structure in the $d(\pi^+,K^+)$ reaction at 1.69 GeV/$c$. In this reaction $\Lambda(1405)$ hyperon resonance is expected to be produced as a doorway to form the $K^-pp$ through the $\Lambda^*p\rightarrow K^-pp$ process. However, most of the produced $\Lambda(1405)$'s would escape from deuteron without secondary reactions. Therefore, coincidence of high-momentum ($>$ 250~MeV/$c$) proton(s) in large emission angles ($39^\circ<\theta_{lab.}<122^\circ$) was requested to enhance the signal-to-background ratio. A broad enhancement in the proton coincidence spectra are observed around the missing-mass of 2.27 GeV/$c^2$, which corresponds to the $K^-pp$ binding energy of 95 $^{+18}_{-17}$ (stat.) $^{+30}_{-21}$ (syst.) MeV and the width of 162 $^{+87}_{-45}$ (stat.) $^{+66}_{-78}$ (syst.) MeV., Comment: 8 pages, 4 figures, submitted to PTEP

Published
2014
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12. Inclusive spectrum of the $d(\pi^+, K^+)$ reaction at 1.69 GeV/c

Author

Ichikawa, Yudai, Nagae, Tomofumi, Bhang, Hyoungchan, Bufalino, Stefania, Ekawa, Hiroyuki, Evtoukhovitch, Petr, Feliciello, Alessandro, Fujioka, Hiroyuki, Hasegawa, Shoichi, Hayakawa, Shuhei, Honda, Ryotaro, Hosomi, Kenji, Imai, Ken'ichi, Ishimoto, Shigeru, Joo, Changwoo, Kanatsuki, Shunsuke, Kiuchi, Ryuta, Koike, Takeshi, Kumawat, Harphool, Matsumoto, Yuki, Miwa, Koji, Moritsu, Manabu, Naruki, Megumi, Niiyama, Masayuki, Nozawa, Yuki, Ota, Ryosuke, Sakaguchi, Atsushi, Sako, Hiroyuki, Samoilov, Valentin, Sato, Susumu, Shirotori, Kotaro, Sugimura, Hitoshi, Suzuki, Shoji, Takahashi, Toshiyuki, Takahashi, Tomonori N., Tamura, Hirokazu, Tanaka, Toshiyuki, Tanida, Kiyoshi, Tokiyasu, Atsushi O., Tsamalaidze, Zviadi, Roy, Bidyut, Ukai, Mifuyu, Yamamoto, Takeshi O., and Yang, Seongbae

Subjects
Nuclear Experiment
Abstract

We have measured an inclusive missing-mass spectrum of the $d(\pi^+, K^+)$ reaction at the pion incident momentum of 1.69 GeV/$c$ at the laboratory scattering angles between 2$^\circ$ and 16$^\circ$ with the missing-mass resolution of 2.7 $\pm$ 0.1 MeV/$c^2$ (FWHM) at the missing mass of 2.27 GeV/$c^{2}$. In this Letter, we first try to understand the spectrum as a simple quasi-free picture based on several known elementary cross sections, considering the neutron/proton Fermi motion in deuteron. While gross spectrum structures are well understood in this picture, we have observed two distinct deviations; one peculiar enhancement at 2.13 GeV/$c^2$ is due to the $\Sigma N$ cusp, and the other notable feature is a shift of a broad bump structure, mainly originating from hyperon resonance productions of $\Lambda(1405)$ and $\Sigma(1385)^{+/0}$, by about 22.4 $\pm$ 0.4 (stat.) $^{+2.7}_{-1.7}$ (syst.) MeV/$c^2$ toward the low-mass side, which is calculated in the kinematics of a proton at rest as the target., Comment: 8 pages, 3 figures, submitted to PTEP

Published
2014
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13. Missing-Mass Measurement of the 12C(K-, K+) Reaction at 1.8 GeV/c with the Superconducting Kaon Spectrometer.

Author

Ichikawa, Yudai, Ahn, Jung Keun, Akazawa, Yuya, Aoki, Kanae, Botta, Elena, Ekawa, Hiroyuki, Evtoukhovitch, Petr, Feliciello, Alessandro, Fujita, Manami, Gogami, Toshiyuki, Hasegawa, Shoichi, Hasegawa, Tomoyuki, Hayakawa, Shuhei, Hayakawa, Tomonori, Honda, Ryotaro, Hosomi, Kenji, Imai, Ken'ichi, Jung, Wooseung, Kanatsuki, Shunsuke, and Kim, Shin Hyung

Subjects
BINDING energy, GAUSSIAN function, SPECTROMETERS, HADRONS
Abstract

We performed a measurement of the inclusive missing-mass spectrum of the |$^{12}$| C |$(K^-, K^+)$| reaction at an incident beam momentum of 1.8 GeV/ c. This measurement was carried out by using the Superconducting Kaon Spectrometer (SKS) and the K1.8 beamline spectrometer at the Hadron Experimental Facility in J-PARC. From the missing-mass of the |$^{12}$| C |$(K^-, K^+)$| reaction, the binding energy of a |$\Xi ^-$| hyperon in a core |$^{11}$| B nucleus, |$B_{\Xi ^-}$|⁠ , can be calculated. Our experimental setup yielded a good energy resolution of 8.2 MeV (full width at half maximum), which allowed us to observe significant enhancements in the proximity of the |$^{12}_{\Xi }$| Be production threshold region. In order to extract information from the missing-mass spectrum, we employed several fitting parameters assumptions. A good agreement with the spectrum shape was obtained by adding two Gaussian functions, with the constant experimental resolution for the |$\Xi$| -hypernuclear states, to the background distribution. The peak positions were obtained to be |$B_{\Xi ^-} = 8.9 \pm 1.4$| (stat.) |$^{+3.8}_{-3.1}$| (syst.) MeV and |$B_{\Xi ^-} = -2.4 \pm 1.3$| (stat.) |$^{+2.8}_{-1.2}$| (syst.) MeV. Another model assumption, one Breit–Wigner function with |$B_{\Xi ^-} = -2.7 \pm 2.2$| (stat.) |$^{+0.5}_{-0.7}$| (syst.) MeV and |$\Gamma = 4.1 \pm 2.1$| (stat.) |$^{+1.2}_{-0.7}$| (syst.) MeV, also yielded a similar |$\chi ^2$| value. [ABSTRACT FROM AUTHOR]

Published
2024
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14. Experimental study of in-medium spectral change of vector mesons at J-PARC

Author

Aoki, Kazuya, primary, Arimizu, Daichi, additional, Ashikaga, Sakiko, additional, Chang, Wen-Chen, additional, Chujo, Tatsuya, additional, Ebata, Kengo, additional, En'yo, Hideto, additional, Esumi, Shinichi, additional, Hamagaki, Hideki, additional, Honda, Ryotaro, additional, Ichikawa, Masaya, additional, Kajikawa, Shunsuke, additional, Kanno, Koki, additional, Kimura, Yuta, additional, Kiyomichi, Akio, additional, Kondo, Takehito, additional, Kyan, Shono, additional, Lin, Che-Sheng, additional, Lin, Chih-Hsun, additional, Morino, Yuhei, additional, Murakami, Hikari, additional, Murakami, Tomoki, additional, Muto, Ryotaro, additional, Nagafusa, Shunnosuke, additional, Nakai, Wataru, additional, Nakasuga, Satomi, additional, Naruki, Megumi, additional, Nonaka, Toshihiro, additional, Noumi, Hiroyuki, additional, Ochiai, Shuta, additional, Ozawa, Kyoichiro, additional, Sakaguchi, Takao, additional, Sako, Hiroyuki, additional, Sakuma, Fuminori, additional, Sato, Susumu, additional, Sawada, Shinya, additional, Sekimoto, Michiko, additional, Shigaki, Kenta, additional, Shirotori, Kotaro, additional, Sugimura, Hitoshi, additional, Takahashi, Tomonori, additional, Takaura, Yudai, additional, Tatsumi, Ryohei, additional, Tsukui, Kosuke, additional, Wang, Po-Hung, additional, Yahiro, Kanta, additional, Yamaguchi, Kanako, additional, and Yokkaichi, Satoshi, additional

Published
2023
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16. Results of analysis of Σ+p scattering events in J-PARC E40 experiment: differential cross sections and phase shifts of 3S1 and 1P1 states.

Author

Nanamura, Takuya, Miwa, Koji, Hayakawa, Shuhei H., Honda, Ryotaro, Nakada, Yoshiyuki, Takahashi, Toshiyuki, Ukai, Mifuyu, and Yamamoto, Takeshi O.

Subjects
DIFFERENTIAL cross sections, SCATTERING (Physics), PHASE shift (Nuclear physics), PROTONS, HYPERONS
Abstract

We performed a novel Σ+p scattering experiment at the J-PARC Hadron Experimental Facility. Approximately 2400 Σ+p scattering events were identified by a kinematical consistency check for the recoil proton. The differential cross sections of the Σ+p elastic scattering were derived with better precision than in previous experiments. By exploiting high-quality differential cross section data and the simple representation of Σ+p interaction in the SU(3) flavor symmetry, we performed a phase-shift analysis on hyperon-nucleon scattering data for the first time. The absolute value of the phase shift of the 3S1 channel, where a large repulsive force was predicted due to the Pauli exclusive effect between quarks, was evaluated. These results indicate that the interaction of the 3S1 channel in the Σ+p channel is moderately repulsive, as the Nijmegen extended-soft-core models predicted. [ABSTRACT FROM AUTHOR]

Published
2022
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17. Λ polarization measurement of the π−p → K0Λ reaction in J-PARC E40 experiment.

Author

Sakao, Tamao, Honda, Ryotaro, Miwa, Koji, Nakada, Yoshiyuki, Nanamura, Takuya, Takahashi, Toshiyuki, Ukai, Mifuyu, and Yamamoto, Takeshi

Subjects
POLARIZATION (Nuclear physics), SCATTERING cross sections (Physics), PHYSICS experiments, DIFFERENTIAL cross sections, QUANTUM scattering
Abstract

We performed the J-PARC E40 experiment to measure the Σp scattering cross sections from 2018 to 2020. Together with the π−p → K+Σ− data, the π−p → K0Λ data were accumulated as a byproduct. The analysis confirmed that Λ could be identified with an S/N ratio of ∼ 2.67. The polarization of Λ(PΛ) was preliminarily derived as 1.009 ± 0.049 for the K0 angular range of 0.7 < cos θK0, CM < 0.8. It is more accurate than the past data [1]. The high polarization enables us to measure not only the differential cross section but also spin observables of the Λp scattering in the future J-PARC experiment. [ABSTRACT FROM AUTHOR]

Published
2022
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18. Extinction Measurement at J-PARC MR with Slow-Extracted Pulsed Proton Beam for COMET Experiment

Author

Noguchi, Kyohei, primary, Fujii, Yuki, additional, Fukao, Yoshinori, additional, Hashimoto, Yoshinori, additional, Higuchi, Yuya, additional, Honda, Ryotaro, additional, Igarashi, Yoichi, additional, Ikeda, Fumihito, additional, Mihara, Satoshi, additional, Muto, Ryotaro, additional, Nakazawa, Yu, additional, Nishiguchi, Hajime, additional, Oishi, Kou, additional, Shoji, Masayoshi, additional, Tamura, Fumihiko, additional, Tojo, Junji, additional, Tomizawa, Masahito, additional, Ueno, Kazuki, additional, and Yoshida, Hisataka, additional

Published
2022
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19. Detector Systems Development for Inter-Bunch Extinction Measurements at the 8 GeV Slow Extracted Pulsed Proton Beam for the COMET Experiment at J-PARC

Author

Oishi, Kou, primary, Fujii, Yuki, additional, Fukao, Yoshinori, additional, Higuchi, Yuya, additional, Honda, Ryotaro, additional, Igarashi, Youichi, additional, Ikeda, Fumihito, additional, Nakazawa, Yu, additional, Nishiguchi, Hajime, additional, Noguchi, Kyohei, additional, Shoji, Masayoshi, additional, Ueno, Kazuki, additional, and Yoshida, Hisataka, additional

Published
2022
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20. Study of Strangeness Photoproduction on the Neutron in the Threshold Region

Author

Kanda, Hiroki, Beckford, Brian, Fujibayashi, Takeji, Fujii, Takao, Fujii, Yu, Futatsukawa, Kenta, Gogami, Toshiyuki, Han, Yun-Cheng, Hashimoto, Osamu, Hirose, Kentaro, Honda, Ryotaro, Hosomi, Kenji, Iguchi, Alan, Ishikawa, Takatsugu, Kaneko, Yusuke, Kaneta, Masashi, Kasai, Yuma, Kawama, Daisuke, Kawasaki, Taito, Kimura, Chigusa, Kiyokawa, Shogo, Koike, Takeshi, Maeda, Kazushige, Maruta, Tomofumi, Maruyama, Nayuta, Matsubara, Masao, Miwa, Koji, Miyagi, Yohei, Nagao, Sho, Nakamura, Satoshi N., Okuyama, Akira, Suzuki, Kotaku, Tamae, Tadaaki, Tamura, Hirokazu, Terada, Nobuhiro, Tsukada, Kyo, Wang, Tie-Shang, Yamamoto, Fumiya, Yamamoto, Takeshi O., and Yamazaki, Hirohito

Published
2013
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21. Continuous timing measurement using a data-streaming DAQ system

Author

Honda, Ryotaro, primary, Aramaki, Takashi, additional, Asano, Hidemitsu, additional, Akaishi, Takaya, additional, Chang, W C, additional, Igarashi, Youichi, additional, Ishikawa, Takatsugu, additional, Kajikawa, Shunsuke, additional, Ma, Yue, additional, Nagai, Kei, additional, Noumi, Hiroyuki, additional, Sako, Hiroyuki, additional, Shirotori, Kotaro, additional, and Takahashi, Tomonori, additional

Published
2021
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22. Data Acquisition System in the First Commissioning Run of the J-PARC E16 Experiment

Author

Takahashi, Tomonori, primary, Aoki, Kazuya, additional, Ashikaga, Sakiko, additional, Chang, Wen-Chen, additional, Hamada, Eitaro, additional, Honda, Ryotaro, additional, Ichikawa, Masaya, additional, Ikeno, Masahiro, additional, Kajikawa, Shunsuke, additional, Kanno, Koki, additional, Kawama, Daisuke, additional, Kondo, Takehito, additional, Lin, Che-Sheng, additional, Lin, Chih-Hsun, additional, Morino, Yuhei, additional, Murakami, Tomoki, additional, Nakai, Wataru, additional, Nakasuga, Satomi, additional, Naruki, Megumi, additional, Obara, Yuki, additional, Ozawa, Kyoichiro, additional, Sako, Hiroyuki, additional, Sato, Susumu, additional, Sendai, Hiroshi, additional, Suzuki, Kazuki, additional, Takaura, Yudai, additional, Tanaka, Manobu, additional, Uchida, Tomohisa, additional, and Yokkaichi, Satoshi, additional

Published
2021
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23. Streaming DAQ Software Prototype at the J-PARC Hadron Experimental Facility

Author

Takahashi, Tomonori, Honda, Ryotaro, Igarashi, Youichi, and Sendai, Hiroshi

Abstract

In recent years, experiments in particle physics and nuclear physics have required faster data collection systems and advanced trigger systems, as the beam intensity has been increased. The current data acquisition (DAQ) system at the Japan Proton Accelerator Research Complex (J-PARC) Hadron Experimental Facility (HEF) uses fixed- and low-latency triggers with dedicated hardware to reduce data and event-building software that merges data into a single endpoint. This conventional DAQ system is expected to be inadequate for future experiments. It has to be replaced with a new simplified but powerful system called streaming DAQ, which collects the detector signals and filters them with software running on many computers. Therefore, we developed a prototype of streaming DAQ software for the J-PARC HEF using FairMQ and Redis as middleware. The key features include simplicity and a low learning cost to develop and be operated by a small number of people. The software can be used in a fully streaming readout system and in the triggered DAQ and the combined DAQ of the hardware and software triggers.

Published
2023
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25. An event excess observed in the deeply bound region of the 12C (K−, p) missing-mass spectrum

Author

Ichikawa, Yudai, primary, Yamagata-Sekihara, Junko, additional, Ahn, Jung Keun, additional, Akazawa, Yuya, additional, Aoki, Kanae, additional, Botta, Elena, additional, Ekawa, Hiroyuki, additional, Evtoukhovitch, Petr, additional, Feliciello, Alessandro, additional, Fujita, Manami, additional, Gogami, Toshiyuki, additional, Hasegawa, Shoichi, additional, Hasegawa, Tomoyuki, additional, Hayakawa, Shuhei, additional, Hayakawa, Tomonori, additional, Hirenzaki, Satoru, additional, Honda, Ryotaro, additional, Hosomi, Kenji, additional, Imai, Ken’ichi, additional, Jung, Wooseung, additional, Kanatsuki, Shunsuke, additional, Kim, Shin Hyung, additional, Kinbara, Shinji, additional, Kobayashi, Kazuya, additional, Lee, Jaeyong, additional, Marcello, Simonetta, additional, Miwa, Koji, additional, Moon, Taejin, additional, Nagae, Tomofumi, additional, Nakada, Yoshiyuki, additional, Nakagawa, Manami, additional, Nanamura, Takuya, additional, Naruki, Megumi, additional, Sakaguchi, Atsushi, additional, Sako, Hiroyuki, additional, Sato, Susumu, additional, Sasaki, Yuki, additional, Shirotori, Kotaro, additional, Sugimura, Hitoshi, additional, Takahashi, Toshiyuki, additional, Tamura, Hirokazu, additional, Tanida, Kiyoshi, additional, Tsamalaidze, Zviadi, additional, Ukai, Mifuyu, additional, and Yamamoto, Takeshi O, additional

Published
2020
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26. Study on the baryon interaction by Ξ hypernuclear spectroscopy with the (K −, K +) reaction

Author

Gogami, Toshiyuki, primary, Kanatsuki, Shunsuke, additional, Nagae, Tomofumi, additional, Ahn, Jung Keun, additional, Akazawa, Yuya, additional, Aoki, Kanae, additional, Botta, Elena, additional, Ekawa, Hiroyuki, additional, Evtoukhovitch, Petr, additional, Feliciello, Alessandro, additional, Fujioka, Hiroyuki, additional, Fujita, Manami, additional, Harada, Takeshi, additional, Hasegawa, Shoichi, additional, Hasegawa, Tomoyuki, additional, Hayakawa, Shuhei, additional, Hirose, Erina, additional, Honda, Ryotaro, additional, Hosomi, Kenji, additional, Imai, Kenichi, additional, Ichikawa, Yudai, additional, Jung, Wooseung, additional, Katayama, Kazuki, additional, Kato, Seigo, additional, Kim, Shinhyung, additional, Kinbara, Shinji, additional, Lee, Jaeyong, additional, Marcello, Simonetta, additional, Miwa, Koji, additional, Moon, Taejin, additional, Moritsu, Manabu, additional, Nakada, Yoshiyuki, additional, Nakagawa, Manami, additional, Nanamura, Takuya, additional, Naruki, Megumi, additional, Ohashi, Tsubasa, additional, Sakaguchi, Atsushi, additional, Sako, Hiroyuki, additional, Sato, Susumu, additional, Shirotori, Kotaro, additional, Sugimura, Hitoshi, additional, Suzuki, Kazuki N, additional, Takahashi, Hitoshi, additional, Takahashi, Tomonori, additional, Takahashi, Toshiyuki, additional, Takenaka, Kohei, additional, Tamura, Hirokazu, additional, Tanida, Kiyoshi, additional, Toyoda, Takafumi, additional, Tsamalaidze, Zviadi, additional, Ukai, Mifuyu, additional, Umezaki, Eiichi, additional, and Yamamoto, Takeshi O, additional

Published
2020
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27. Experimental Study of Di-quark Correlation by Charmed Baryon Spectroscopy at J-PARC High-Momentum Secondary Beam Line

Author

Komatsu, Yusuke, primary, Ahn, Jung-Kun, additional, Ajimura, Shuhei, additional, Akaishi, Takaya, additional, Aoki, Kazuya, additional, Asano, Hidemitsu, additional, Chang, Wen-Chen, additional, Honda, Ryotaro, additional, Ichikawa, Yudai, additional, Ishikawa, Takatsugu, additional, Ma, Yue, additional, Miwa, Koji, additional, Miyachi, Yoshiyuki, additional, Morino, Yuhei, additional, Nagai, Kei, additional, Nakano, Takashi, additional, Naruki, Megumi, additional, Noumi, Hiroyuki, additional, Ozawa, Kyoichiro, additional, Sakuma, Fuminori, additional, Sawada, Takahiro, additional, Shirotori, Kotaro, additional, Sugaya, Yorihito, additional, Takahashi, Tomonori, additional, Tanida, Kiyoshi, additional, Tomida, Natsuki, additional, Yamaga, Takumi, additional, and Yang, Seongbae, additional

Published
2019
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28. A Σp Scattering Experiment at J-PARC and the Analysis Status

Author

Nakada, Yoshiyuki, primary, Ahn, Jung Keun, additional, Akazawa, Yuya, additional, Aramaki, Takashi, additional, Ashikaga, Sakiko, additional, Callier, Stephane, additional, Chiga, Nobuyuki, additional, Choi, Sung Wook, additional, Ekawa, Hiroyuki, additional, Evtoukhovitch, Petr, additional, Fujioka, Norina, additional, Fujita, Manami, additional, Hasegawa, Shoichi, additional, Hayakawa, Shuhei, additional, Honda, Ryotaro, additional, Hoshino, Suharu, additional, Hosomi, Kenji, additional, Ichikawa, Masaya, additional, Ichikawa, Yudai, additional, Ieiri, Masaharu, additional, Ikeda, Michihiko, additional, Imai, Ken’ichi, additional, Ishikawa, Yuji, additional, Ishimoto, Shigeru, additional, Jung, Woo Seung, additional, Kanauchi, Honoka, additional, Kanda, Hiroki, additional, Kang, Byung Min, additional, Kawai, Hideyuki, additional, Kim, Shin Hyung, additional, Kobayashi, Kazuya, additional, Koike, Takeshi, additional, Matsuda, Kumpei, additional, Matsumoto, Yuki, additional, Miwa, Koji, additional, Nagatomi, Ryohei, additional, Nakagawa, Manami, additional, Nakamura, Isamu, additional, Nanamura, Takuya, additional, Naruki, Megumi, additional, Ozawa, Shotaro, additional, Raux, Ludovic, additional, Sakaguchi, Atsushi, additional, Sako, Hiroyuki, additional, Sato, Susumu, additional, Shiozaki, Takehiro, additional, Shirotori, Kotaro, additional, Suzuki, Kazuki, additional, Suzuki, Shoji, additional, Tabata, Makoto, additional, de La Taille, Christophe, additional, Takahashi, Hitoshi, additional, Takahashi, Toshiyuki, additional, Takahashi, Tomonori, additional, Tamura, Hirokazu, additional, Tanaka, Manobu, additional, Tanida, Kiyoshi, additional, Tsamalaidze, Zviadi, additional, Ukai, Mifuyu, additional, Umetsu, Hiroo, additional, Yamamoto, Takeshi O., additional, Yang, Seong Bae, additional, and Yoshimura, Koji, additional

Published
2019
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29. Measurement of Vector Meson Mass in Nuclear Matter at J-PARC

Author

Ashikaga, Sakiko, primary, Aoki, Kazuya, additional, Chujo, Tatsuya, additional, En’yo, Hideto, additional, Esumi, Shinichi, additional, Fujii, Ryohei, additional, Hamagaki, Hideki, additional, Honda, Ryotaro, additional, Ichikawa, Masaya, additional, Kanno, Koki, additional, Kiyomichi, Akio, additional, Komatsu, Yusuke, additional, Miyata, Seiya, additional, Morino, Yuhei, additional, Murakami, Hikari, additional, Murakami, Tomoki N., additional, Muto, Ryotaro, additional, Nakai, Wataru, additional, Naruki, Megumi, additional, Noumi, Hiroyuki, additional, Ozawa, Kyoichiro, additional, Sakaguchi, Takao, additional, Sako, Hiroyuki, additional, Sakuma, Fuminori, additional, Sato, Susumu, additional, Sawada, Shinya, additional, Sekimoto, Michiko, additional, Shigaki, Kenta, additional, Sugimura, Hitoshi, additional, Suzuki, Kazuki N., additional, Takahashi, Tomonori N., additional, Watanabe, Yosuke S., additional, and Yokkaichi, Satoshi, additional

Published
2019
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30. The Ξ− Atom X-ray Spectroscopy at J-PARC

Author

Fujita, Manami, primary, Honda, Ryotaro, additional, Hosomi, Kenji, additional, Ishikawa, Yuji, additional, Kanauchi, Honoka, additional, Koike, Takeshi, additional, Tamura, Hirokazu, additional, Ukai, Mifuyu, additional, and Yamamoto, Takeshi O., additional

Published
2019
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31. Study of Y* in Nuclei through C(K−, π+)X Spectrum at 1.8 GeV/c in the J-PARC E05 Experiment

Author

Honda, Ryotaro, primary, Ahn, Jung Keun, additional, Akazawa, Yuya, additional, Aoki, Kanae, additional, Botta, Elena, additional, Ekawa, Hiroyuki, additional, Evtoukhovitch, Petr, additional, Feliciello, Alessandro, additional, Fujita, Manami, additional, Gogami, Toshiyuki, additional, Hasegawa, Shoichi, additional, Hayakawa, Shuhei, additional, Hayakawa, Tomonari, additional, Hosomi, Kenji, additional, Imai, Ken’ichi, additional, Ichikawa, Yudai, additional, Jung, Wooseung, additional, Kanatsuki, Shunsuke, additional, Kim, Shinhyung, additional, Kinbara, Sinji, additional, Kobayashi, Kazuya, additional, Lee, Jaeyong, additional, Marcello, Simonetta, additional, Miwa, Koji, additional, Moon, Taejin, additional, Nagae, Tonofumi, additional, Nakada, Yoshiyuki, additional, Nakagawa, Manami, additional, Nanamura, Takuya, additional, Naruki, Megumi, additional, Sakaguchi, Atsushi, additional, Sako, Hiroyuki, additional, Sato, Susumu, additional, Sasaki, Yuki, additional, Shirotori, Kotaro, additional, Sugimura, Hitoshi, additional, Takahashi, Toshiyuki, additional, Tamura, Hirokazu, additional, Tanida, Kiyoshi, additional, Tsamalaidze, Zviadi, additional, Ukai, Mifuyu, additional, and Yamamoto, Takeshi O., additional

Published
2019
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32. Search for Excited State of \(_{\Sigma }^{4}\text{He}\) Hypernucleus in the J-PARC E13 Experiment

Author

Nakagawa, Manami, primary, Agnello, Michelangelo, additional, Akazawa, Yuya, additional, Amano, Nobuaki, additional, Aoki, Kanae, additional, Botta, Elena, additional, Chiga, Nobuyuki, additional, Ekawa, Hiroyuki, additional, Evtoukhovitch, Petr, additional, Feliciello, Alessandro, additional, Fujita, Manami, additional, Gogami, Toshiyuki, additional, Hasegawa, Shoichi, additional, Hayakawa, Shuhei H., additional, Hayakawa, Tomonari, additional, Honda, Ryotaro, additional, Hosomi, Kenji, additional, Hwang, Sanghoon, additional, Ichige, Natsumi, additional, Ichikawa, Yudai, additional, Ikeda, Michihiko, additional, Imai, Ken’ichi, additional, Ishimoto, Shigeru, additional, Kanatsuki, Shunsuke, additional, Kim, Minho, additional, Kim, Shinhyung, additional, Kinbara, Shinji, additional, Koike, Takeshi, additional, Lee, Jaeyong, additional, Marcello, Simonetta, additional, Miwa, Koji, additional, Moon, Taejin, additional, Nagae, Tomofumi, additional, Nagao, Sho, additional, Nakada, Yoshiyuki, additional, Ogura, Yu, additional, Sakaguchi, Atsushi, additional, Sako, Hiroyuki, additional, Sasaki, Yuki, additional, Sato, Susumu, additional, Shiozaki, Takehiro, additional, Shirotori, Kotaro, additional, Sugimura, Hitoshi, additional, Suto, Sadami, additional, Suzuki, Shoji, additional, Takahashi, Toshiyuki, additional, Tamura, Hirokazu, additional, Tanabe, Kosuke, additional, Tanida, Kiyoshi, additional, Tsamalaidze, Zviadi, additional, Ukai, Mifuyu, additional, Yamamoto, Takeshi O., additional, Yamamoto, Yasutaka, additional, and Yang, Seongbae, additional

Published
2019
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33. First γ-Ray Spectroscopy of an sd-Shell Hypernucleus, \({}_{\Lambda \ }^{19}\text{F}\)

Author

Yang, Seongbae, primary, Ahn, Jung Keun, additional, Akazawa, Yuya, additional, Aoki, Kanae, additional, Chiga, Nobuyuki, additional, Ekawa, Hiroyuki, additional, Evtoukhovitch, Petr, additional, Feliciello, Alessandro, additional, Fujita, Manami, additional, Hasegawa, Shoichi, additional, Hayakawa, Shuhei, additional, Hayakawa, Tomonari, additional, Honda, Ryotaro, additional, Hosomi, Kenji, additional, Hwang, Sanghoon, additional, Ichige, Natsumi, additional, Ichikawa, Yudai, additional, Ikeda, Michihiko, additional, Imai, Ken’ichi, additional, Ishimoto, Shigeru, additional, Kanatsuki, Shunsuke, additional, Kim, Shin Hyung, additional, Kinbara, Shinji, additional, Kobayashi, Kazuya, additional, Koike, Takeshi, additional, Lee, Jaeyong, additional, Miwa, Koji, additional, Moon, Taejin, additional, Nagae, Tomofumi, additional, Nakada, Yoshiyuki, additional, Nakagawa, Manami, additional, Ogura, Yu, additional, Sakaguchi, Atsushi, additional, Sako, Hiroyuki, additional, Sasaki, Yuki, additional, Sato, Susumu, additional, Shirotori, Kotaro, additional, Sugimura, Hitoshi, additional, Suto, Sadami, additional, Suzuki, Shoji, additional, Takahashi, Toshiyuki, additional, Tamura, Hirokazu, additional, Tanida, Kiyoshi, additional, Togawa, Yuichi, additional, Tsamalaidze, Zviadi, additional, Ukai, Mifuyu, additional, Wang, Taofeng, additional, and Yamamoto, Takeshi O., additional

Published
2019
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34. Status of J-PARC E07: Systematic study of double strangeness nuclei with hybrid emulsion method

Author

Yoshida, Junya, primary, Agari, Keizo, additional, Ahn, Jung Keun, additional, Akaishi, Takaya, additional, Akazawa, Yuya, additional, Ashikaga, Sakiko, additional, Bassalleck, Bernd, additional, Bleser, Sebastian, additional, Choi, Wonji, additional, Chung, Woo Seung, additional, Ekawa, Hiroyuki, additional, Endo, Yoko, additional, Fujikawa, Yuki, additional, Fujioka, Norina, additional, Fujita, Manami, additional, Goto, Ryosuke, additional, Han, Yuncheng, additional, Hasegawa, Shoichi, additional, Hashimoto, Tadashi, additional, Hayakawa, Shuhei, additional, Hayakawa, Tomonari, additional, Hayata, Emi, additional, Hicks, Kenneth, additional, Hirose, Erina, additional, Hirose, Masanori, additional, Honda, Ryotaro, additional, Hoshino, Kaoru, additional, Hoshino, Suharu, additional, Hosomi, Kenji, additional, Hwang, Sang Hoon, additional, Ichikawa, Yudai, additional, Ichikawa, Masaya, additional, Ieiri, Masaharu, additional, Imai, Kenichi, additional, Inaba, Kento, additional, Ishikawa, Yuji, additional, Iskendir, Abzal, additional, Ito, Hiroki, additional, Ito, Kazuyua, additional, Kanatsuki, Shunsuke, additional, Kanauchi, Honoka, additional, Kasagi, Ayumi, additional, Kawai, Toshihide, additional, Kim, Min Ho, additional, Kim, Shin Hyung, additional, Kim, Sung Hyun, additional, Kim, Young Jun, additional, Kinbara, Shinji, additional, Kiuchi, Ryuta, additional, Kobayashi, Hidetaka, additional, Kobayashi, Kazuya, additional, Koike, Takeshi, additional, Koshikawa, Ami, additional, Lee, Jae Yong, additional, Lee, Jong Won, additional, Lee, Myeong Jae, additional, Ma, Tianli, additional, Matsumoto, Shota, additional, Minakawa, Michifumi, additional, Miwa, Koji, additional, Moe, Aung Thu, additional, Moon, Tae Jin, additional, Moritsu, Manabu, additional, Nagase, Yuichi, additional, Nakada, Yoshiyuki, additional, Nakagawa, Manami, additional, Nakashima, Daisuke, additional, Nakazawa, Kazuma, additional, Nanamura, Takuya, additional, Naruki, Megumi, additional, Nyaw, Aung Nay Lin, additional, Ogura, Yu, additional, Ohashi, Masaki, additional, Oue, KenIchiro, additional, Ozawa, Shotaro, additional, Pochodzalla, Josef, additional, Ryu, Sun Young, additional, Sako, Hiroyuki, additional, Sasaki, Yuki, additional, Sato, Susumu, additional, Sato, Yoshinori, additional, Schupp, Falk, additional, Sekimoto, Michiko, additional, Shiratori, Koutarou, additional, Soe, Min Min, additional, Soe, Myint Kyaw, additional, Sohn, Jong Yoon, additional, Sugimura, Hitoshi, additional, Suzuki, Kazuki, additional, Sweet, May, additional, Takahashi, Hitoshi, additional, Takahashi, Toshiyuki, additional, Takahashi, Yu, additional, Takeda, Tomoya, additional, Tamura, Hirokazu, additional, Tanida, Kiyoshi, additional, Theint, Aye Moh Moh, additional, Tint, Khin Than, additional, Toyama, Yuichi, additional, Ukai, Mifuyu, additional, Umezaki, Eiichi, additional, Watabe, Toyoki, additional, Watanabe, Ken, additional, Yamamoto, Takeshi, additional, Yang, Seong Bae, additional, Yoon, Chun Sil, additional, Yoshimoto, Masahiro, additional, Zhang, Donhai, additional, and Zhang, Zhi, additional

Published
2019
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35. Observation of a Ξ bound state in the 12C(K−, K+) reaction at 1.8 GeV/c

Author

Nagae, Tomofumi, primary, Ahn, Jung Keun, additional, Akazawa, Yuya, additional, Aoki, Kanae, additional, Botta, Elena, additional, Ekawa, Hiroyuki, additional, Evtoukhovitch, Petr, additional, Feliciello, Alessandro, additional, Fujita, Manami, additional, Gogami, Toshiyuki, additional, Hasegawa, Shoichi, additional, Hasegawa, Tomoyuki, additional, Hayakawa, Shuhei, additional, Hayakawa, Tomonori, additional, Honda, Ryotaro, additional, Hosomi, Kenji, additional, Ichikawa, Yudai, additional, Imai, Ken’ichi, additional, Jung, Wooseung, additional, Kanatsuki, Shunsuke, additional, Kim, Shinhyung, additional, Kinbara, Sinji, additional, Kobayashi, Kazuya, additional, Lee, Jaeyong, additional, Marcello, Simonetta, additional, Miwa, Koji, additional, Moon, Taejin, additional, Nakada, Yoshiyuki, additional, Nakagawa, Manami, additional, Nanamura, Takuya, additional, Naruki, Megumi, additional, Sakaguchi, Atsushi, additional, Sako, Hiroyuki, additional, Sato, Susumu, additional, Sasaki, Yuki, additional, Shirotori, Kotaro, additional, Sugimura, Hitoshi, additional, Takahashi, Toshiyuki, additional, Tamura, Hirokazu, additional, Tanida, Kiyoshi, additional, Tsamalaidze, Zviadi, additional, Ukai, Mifuyu, additional, and Yamamoto, Takeshi. O., additional

Published
2019
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36. K̄ and nucleus system studied by 12C(K−, p) spectrum

Author

Ichikawa, Yudai, primary, Yamagata-Sekihara, Junko, additional, Ahn, Jung Keun, additional, Akazawa, Yuya, additional, Aoki, Kanae, additional, Bottta, Elena, additional, Ekawa, Hiroyuki, additional, Evtoukhovitch, Petr, additional, Feliciello, Alessandro, additional, Fujita, Manami, additional, Gogami, Toshiyuki, additional, Hasegawa, Shoichi, additional, Hasegawa, Tomoyuki, additional, Hayakawa, Shuhei, additional, Hayakawa, Tomonori, additional, Hirenzaki, Satoru, additional, Honda, Ryotaro, additional, Hosomi, Kenji, additional, Imai, Ken’ichi, additional, Jung, Wooseung, additional, Kanatsuki, Shunsuke, additional, Kim, Shinhyung, additional, Kinbara, Sinji, additional, Kobayashi, Kazuya, additional, Lee, Jaeyong, additional, Marcello, Simonetta, additional, Miwa, Koji, additional, Moon, Taejin, additional, Nagae, Tomofumi, additional, Nakada, Yoshiyuki, additional, Nakagawa, Manami, additional, Nanamura, Takuya, additional, Naruki, Megumi, additional, Sakaguchi, Atsushi, additional, Sako, Hiroyuki, additional, Sato, Susumu, additional, Sasaki, Yuki, additional, Shirotori, Kotaro, additional, Sugimura, Hitoshi, additional, Takahashi, Toshiyuki, additional, Tamura, Hirokazu, additional, Tanida, Kiyoshi, additional, Tsamalaidze, Zviadi, additional, Ukai, Mifuyu, additional, and Yamamoto, Takeshi. O., additional

Published
2019
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37. An event excess observed in the deeply bound region of the 12C (K−, p) missing-mass spectrum.

Author

Ichikawa, Yudai, Yamagata-Sekihara, Junko, Ahn, Jung Keun, Akazawa, Yuya, Aoki, Kanae, Botta, Elena, Ekawa, Hiroyuki, Evtoukhovitch, Petr, Feliciello, Alessandro, Fujita, Manami, Gogami, Toshiyuki, Hasegawa, Shoichi, Hasegawa, Tomoyuki, Hayakawa, Shuhei, Hayakawa, Tomonori, Hirenzaki, Satoru, Honda, Ryotaro, Hosomi, Kenji, Imai, Ken'ichi, and Jung, Wooseung

Subjects
GREEN'S functions, QUASI-elastic scattering, KAON spectra, HYPERFRAGMENTS, FERMI energy
Abstract

We have measured, for the first time, the inclusive missing-mass spectrum of the |$^{12}$| C |$(K^-, p)$| reaction at an incident kaon momentum of 1.8 GeV/ |$c$| at the J-PARC K1.8 beamline. We observed a prominent quasi-elastic peak (⁠|$K^-p \rightarrow K^-p$|⁠) in this spectrum. In the quasi-elastic peak region, the effect of secondary interaction is apparently observed as a peak shift, and the peak exhibits a tail in the bound region. We compared the spectrum with a theoretical calculation based on the Green's function method by assuming different values of the parameters for the |$\bar{K}$| –nucleus optical potential. We found that the spectrum shape in the binding-energy region |$-300 \, \text{MeV} < B_{K} < 40$|  MeV is best reproduced with the potential depths |$V_0 = -80$|  MeV (real part) and |$W_0 = -40$|  MeV (imaginary part). On the other hand, we observed a significant event excess in the deeply bound region around |$B_{K} \sim 100$|  MeV, where the major decay channel of |$K^- NN \to \pi\Sigma N$| is energetically closed, and the non-mesonic decay modes (⁠|$K^- NN \to \Lambda N$| and |$\Sigma N$|⁠) should mainly contribute. The enhancement is fitted well by a Breit–Wigner function with a kaon-binding energy of 90 MeV and width 100 MeV. A possible interpretation is a deeply bound state of a |$Y^{*}$| -nucleus system. [ABSTRACT FROM AUTHOR]

Published
2020
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40. Spectroscopy of Nuclei with Multi-Strangeness by Using New S-2S Spectrometer at J-PARC

Author

Gogami, Toshiyuki, primary, Ahn, Jung Keun, additional, Akazawa, Yuya, additional, Amano, Nobuaki, additional, Aoki, Kanae, additional, Botta, Elena, additional, Ekawa, Hiroyuki, additional, Evtoukhovitch, Petr, additional, Feliciello, Alessandro, additional, Fujioka, Hiroyuki, additional, Fujita, Manami, additional, Hasegawa, Shoichi, additional, Hasegawa, Tomoyuki, additional, Hayakawa, Shuhei, additional, Hayakawa, Tomonari, additional, Hirose, Erina, additional, Honda, Ryotaro, additional, Hosomi, Kenji, additional, Imai, Kenichi, additional, Ichikawa, Yudai, additional, Jung, Wooseung, additional, Kanatsuki, Shunsuke, additional, Kato, Seigo, additional, Kim, Shinhyung, additional, Kinbara, Shinji, additional, Kobayashi, Kazuya, additional, Lee, Jaeyong, additional, Marcello, Simonetta, additional, Miwa, Koji, additional, Moon, Taejin, additional, Moritsu, Manabu, additional, Nagae, Tomofumi, additional, Nakada, Yoshiyuki, additional, Nakagawa, Manami, additional, Nanamura, Takuya, additional, Naruki, Megumi, additional, Sakaguchi, Atsushi, additional, Sako, Hiroyuki, additional, Sasaki, Yuki, additional, Sato, Susumu, additional, Shirotori, Kotaro, additional, Sugimura, Hitoshi, additional, Takahashi, Hitoshi, additional, Takahashi, Toshiyuki, additional, Takenaka, Kohei, additional, Tamura, Hirokazu, additional, Tanida, Kiyoshi, additional, Tsamalaidze, Zviadi, additional, Ukai, Mifuyu, additional, and Yamamoto, Takeshi O, additional

Published
2017
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42. The Recent Results of Strangeness Photoproduction in the Threshold Region at ELPH-Tohoku

Author

Kanda, Hiroki, primary, Beckford, Brian, additional, Bydžovský, Petr, additional, Fujibayashi, Takeji, additional, Fujii, Takao, additional, Fujii, Yu, additional, Futatsukawa, Kenta, additional, Gogami, Toshiyuki, additional, Han, Yun-Cheng, additional, Hashimoto, Osamu, additional, Hirose, Kentaro, additional, Hosomi, Kenji, additional, Honda, Ryotaro, additional, Iguchi, Alan, additional, Ishikawa, Takatsugu, additional, Kaneta, Masashi, additional, Kaneko, Yusuke, additional, Kasai, Yuma, additional, Kawasaki, Taito, additional, Kimura, Chigusa, additional, Kiyokawa, Shogo, additional, Koike, Takeshi, additional, Maeda, Kazushige, additional, Maruyama, Nayuta, additional, Matsubara, Masao, additional, Miwa, Koji, additional, Miyagi, Yohei, additional, Nagao, Sho, additional, Nakamura, Satoshi N., additional, Nishizawa, Takashi, additional, Okuyama, Akira, additional, Sotona, Miloslav, additional, Tamae, Tadaaki, additional, Tamura, Hirokazu, additional, Tsukada, Kyo, additional, Terada, Nobu, additional, Ukai, Mifuyu, additional, Wang, Tie-Shan, additional, Yamamoto, Fumiya, additional, Yamamoto, Takeshi O., additional, and Yamazaki, Hirohito, additional

Published
2017
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43. Repulsion and absorption of the Σ-nucleus potential for Σ−−5He in the 6Li(π−,K+) reaction

Author

Harada, Toru, Honda, Ryotaro, and Hirabayashi, Yoshiharu

Abstract

We study phenomenologically inclusive spectra of the 6Li(π-,K+) reaction at 1.2 GeV/c within a distorted-wave impulse approximation with the optimal Fermi-averaging π-p→K+Σ-t matrix. We attempt to clarify the property of a Σ-nucleus potential for Σ--5He by comparing the calculated spectra with the data of the J-PARC E10 experiment. The result shows that the repulsive and absorptive components of the Σ--5He potential provide the ability to explain the data of the continuum spectra in Σ and Λ regions; the strengths of VΣ=+30±10 MeV and WΣ=-26±2 MeV are favored within the Woods-Saxon potential, consistent with analyses for heavier nuclei. Effects of the size and potential range for Σ--5He in the neutron excess of (N-Z)/(N+Z)= 0.2 are also discussed.

Published
2018

44. ^6Li(pi^-,K^+)X反応を用いたミッシングマス分光による^6_LambdaHの探索

Author

Honda, Ryotaro, Hasegawa, Shoichi, Hayakawa, Shuhei, Hosomi, Kenji, Ichikawa, Yudai, Imai, Kenichi, Nagamiya, Shoji, Sako, Hiroyuki, Sato, Susumu, Sugimura, Hitoshi, Tanida, Kiyoshi, 他55名, and 55 of others

Abstract

We searched for the bound state of the neutron-rich $\Lambda$-hypernucleus $^6_\Lambda$H, using the $^6$Li$(\pi^-,K^+)X$ double charge-exchange reaction at a $\pi^-$ beam momentum of 1.2 GeV/$c$ at J-PARC. A total of $1.4 \times 10^{12}$ $\pi^-$ was driven onto a $^6$Li target of 3.5 g/cm$^2$ thickness. No event was observed below the bound threshold, i.e., the mass of $^4_\Lambda$H+$2n$, in the missing-mass spectrum of the $^6$Li$(\pi^-,K^+)X$ reaction in the $2^{\circ} < \theta_{\pi K}

Published
2017

45. Study of the \(\bar{K}\)-Nucleus Interaction by Using the 12C(K−, p) Reaction at J-PARC

Author

Ichikawa, Yudai, primary, Ahn, Jung Keun, additional, Akazawa, Yuya, additional, Aoki, Kanae, additional, Botta, Elena, additional, Ekawa, Hiroyuki, additional, Evtoukhovitch, Petr, additional, Feliciello, Alessandro, additional, Fujita, Manami, additional, Gogami, Toshiyuki, additional, Hasegawa, Shoichi, additional, Hasegawa, Tomoyuki, additional, Hayakawa, Shuhei, additional, Hayakawa, Tomonori, additional, Honda, Ryotaro, additional, Hosomi, Kenji, additional, Imai, Ken’ichi, additional, Jung, Wooseung, additional, Kanatsuki, Shunsuke, additional, Kim, Shinhyung, additional, Kinbara, Shinji, additional, Kobayashi, Kazuya, additional, Lee, Jaeyong, additional, Marcello, Simonetta, additional, Miwa, Koji, additional, Moon, Taejin, additional, Nagae, Tomofumi, additional, Nakada, Yoshiyuki, additional, Nakagawa, Manami, additional, Nanamura, Takuya, additional, Naruki, Megumi, additional, Sakaguchi, Atsushi, additional, Sako, Hiroyuki, additional, Sato, Susumu, additional, Sasaki, Yuki, additional, Shirotori, Kotaro, additional, Sugimura, Hitoshi, additional, Takahashi, Toshiyuki, additional, Tamura, Hirokazu, additional, Tanida, Kiyoshi, additional, Tsamalaidze, Zviadi, additional, Ukai, Mifuyu, additional, and Yamamoto, Takeshi. O., additional

Published
2017
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46. Measurement of the Vector Meson Spectral Modification in the Nuclear Medium at J-PARC

Author

Komatsu, Yusuke, primary, Aoki, Kazuya, additional, Ashikaga, Sakiko, additional, Chujo, Tatsuya, additional, En’yo, Hideto, additional, Esumi, Shunichi, additional, Hamagaki, Hideki, additional, Honda, Ryotaro, additional, Kanno, Koki, additional, Kiyomichi, Akio, additional, Miyata, Seiya, additional, Morino, Yuhei, additional, Murakami, Hikari, additional, Muto, Ryotaro, additional, Nakai, Wataru, additional, Naruki, Megumi, additional, Noumi, Hiroyuki, additional, Obara, Yuki, additional, Ozawa, Kyoichiro, additional, Sakaguchi, Takao, additional, Sako, Hiroyuki, additional, Sato, Susumu, additional, Sakuma, Fuminori, additional, Sawada, Shin’ya, additional, Sekimoto, Michiko, additional, Shigaki, Kenta, additional, Shibukawa, Takuya, additional, Sugimura, Hitoshi, additional, Takahashi, Tomonori, additional, Yokkaichi, Satoshi, additional, and Watanabe, Yosuke, additional

Published
2017
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47. J-PARC E27 Experiment to Search for a K−pp Bound State

Author

Ichikawa, Yudai, primary, Nagae, Tomofumi, additional, Bhang, Hyoungchan, additional, Bufalino, Stefania, additional, Ekawa, Hiroyuki, additional, Evtoukhovitch, Petr, additional, Feliciello, Alessandro, additional, Fujioka, Hiroyuki, additional, Hasegawa, Shoichi, additional, Hayakawa, Shuhei, additional, Honda, Ryotaro, additional, Hosomi, Kenji, additional, Imai, Ken’ichi, additional, Ishimoto, Shigeru, additional, Joo, Changwoo, additional, Kanatsuki, Shunsuke, additional, Kiuchi, Ryuta, additional, Koike, Takeshi, additional, Kumawat, Harphool, additional, Matsumoto, Yuki, additional, Miwa, Koji, additional, Moritsu, Manabu, additional, Naruki, Megumi, additional, Niiyama, Masayuki, additional, Nozawa, Yuki, additional, Ota, Ryosuke, additional, Sakaguchi, Atsushi, additional, Sako, Hiroyuki, additional, Samoilov, Valentin, additional, Sato, Susumu, additional, Shirotori, Kotaro, additional, Sugimura, Hitoshi, additional, Suzuki, Shoji, additional, Takahashi, Toshiyuki, additional, Takahashi, Tomonori N., additional, Tamura, Hirokazu, additional, Tanaka, Toshiyuki, additional, Tanida, Kiyoshi, additional, Tokiyasu, Atsushi O., additional, Tsamalaidze, Zviadi, additional, Roy, Bidyut, additional, Ukai, Mifuyu, additional, Yamamoto, Takeshi O., additional, and Yang, Seongbae, additional

Published
2015
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48. Searching for the H-Dibaryon in J-PARC with a Large Acceptance Hyperon Spectrometer

Author

Han, Yuncheng, primary, Ahn, Jung Keun, additional, Bassalleck, Bernd, additional, Guo, Lei, additional, Fujioka, Hiroyuki, additional, Hasegawa, Shoichi, additional, Hicks, Kenneth, additional, Honda, Ryotaro, additional, Hwang, Sang Hoon, additional, Ichikawa, Yudai, additional, Ieiri, Masaharu, additional, Imai, Kenichi, additional, Kim, Min Ho, additional, Kim, Shin Hyung, additional, Kim, Sung Hyun, additional, Lee, Jaeyoung, additional, Lee, Hyo Sang, additional, Lugendo, Innocent Jimmy, additional, Miwa, Koji, additional, Niiyama, Masayuki, additional, Ozawa, Kyoichiro, additional, Park, Jae Beom, additional, Ryu, Sun Young, additional, Sako, Hiroyuki, additional, Sato, Susumu, additional, Sugimura, Hitoshi, additional, Sumihama, Mizuki, additional, Shirotori, Kotaro, additional, Takahashi, Hitoshi, additional, Takahashi, Toshiyuki, additional, and Tanida, Kiyoshi, additional

Published
2015
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49. Charmed Baryon Spectroscopy Experiment at J-PARC

Author

Shirotori, Kotaro, primary, Ahn, Jung-Kun, additional, Ajimura, Shuhei, additional, Aoki, Kazuya, additional, Honda, Ryotaro, additional, Ishikawa, Takatsugu, additional, Ma, Yue, additional, Miwa, Koji, additional, Miyachi, Yoshiyuki, additional, Morino, Yuhei, additional, Nakano, Takashi, additional, Naruki, Megumi, additional, Noumi, Hiroyuki, additional, Ozawa, Kyoichiro, additional, Sakuma, Fuminori, additional, Sawada, Takahiro, additional, Sugaya, Yorihito, additional, Takahashi, Tomonori, additional, Tanida, Kiyoshi, additional, Chang, Wen-Chen, additional, and Yamaga, Takumi, additional

Published
2015
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50. Measurement of 3-Body Hadronic Reactions with HypTPC at J-PARC

Author

Hwang, Sanghoon, primary, Ahn, Jung Keun, additional, Bassalleck, Bernd, additional, Fujioka, Hiroyuki, additional, Guo, Lei, additional, Han, Yuncheng, additional, Hasegawa, Shoichi, additional, Hicks, Kenneth, additional, Honda, Ryotaro, additional, Hosomi, Kenji, additional, Ichikawa, Yudai, additional, Ieiri, Masaharu, additional, Imai, Kenichi, additional, Kim, Min Ho, additional, Kim, Shin Hyung, additional, Kim, Sung Hyun, additional, Lee, Jaeyong, additional, Lee, Hyo Sang, additional, Lugendo, Innocent Jimmy, additional, Miwa, Koji, additional, Moon, Taejin, additional, Niiyama, Masayuki, additional, Ozawa, Kyoichiro, additional, Park, Jae Beom, additional, Ryu, Sun Young, additional, Sako, Hiroyuki, additional, Sato, Susumu, additional, Sugimura, Hitoshi, additional, Sumihama, Mizuki, additional, Shirotori, Kotaro, additional, Takahashi, Hitoshi, additional, Takahashi, Toshiyuki, additional, and Tanida, Kiyoshi, additional

Published
2015
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