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)
Pre-published on:
March 14, 2022
Published on:
May 24, 2022
Abstract
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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