PoS - Proceedings of Science
Volume 380 - Particles and Nuclei International Conference 2021 (PANIC2021) - Hadrons in medium - hyperons and mesons in nuclear matter
Experimental status toward the direct lifetime measurement of Hypertriton using the (K-, pi0) reaction at J-PARC
T. Akaishi*, H. Asano, X. Chen, A. Clozza, C. Curceanu, R. Del Grande, C. Guaraldo, C. Han, T. Hashimoto, M. Iliescu, K. Inoue, S. Ishimoto, K. Itahashi, M. Iwasaki, Y. Ma, R. Murayama, M. Miliucci, H. Noumi, H. Ohnishi, S. Okada, H. Outa, K. Piscicchia, A. Sakaguchi, F. Sakuma, M. Sato, A. Scordo, D. Sirghi, F. Sirghi, K. Shirotori, S. Suzuki, K. Tanida, T. Toda, M. Tokuda, T. Yamaga, X. Yuan, P. Zhang, Y. Zhang and H. Zhanget al. (click to show)
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Pre-published on: March 14, 2022
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In order to shed light on hypertriton lifetime puzzle, we will measure the hypertriton lifetime in time domain directly as an independent and complementary approach from heavy-ion experiments. We employ the (K$^-$, $\pi^0$) reaction to populate hypertriton using a K$^-$ beam at J-PARC. By detecting a high-energy gamma-ray decaying from $\pi^0$ at forward angle, this reaction can be tagged efficiently. We newly developed PbF$_2$ calorimeter and the performance was evaluated with positron and hadron beams. We found that the energy resolution is $\sigma$/E = 5.0 %/$\sqrt{\rm{E/GeV}}$, which is sufficient for the high-energy gamma-ray tagging in our experiment.
DOI: https://doi.org/10.22323/1.380.0214
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