학술논문
High resolution spectroscopy of the "ΣN cusp" by using the d(K− , π− ) reaction.
Document Type
Article
Author
Ichikawa, Yudai; Ahn, Jungkeun; Choi, Sungwook; Fujita, Manami; Gogami, Toshiyuki; Hasegawa, Shoichi; Harada, Takeshi; Hayakawa, Shuhei; Ishimoto, Shigeru; Jung, Woose-ung; Kang, Byungmin; Kim, Shinhyung; Miwa, Koji; Nagae, Tomofumi; Nanamura, Takuya; Sako, Hiroyuki; Sato, Susumu; Suzuki, Shoji; Tamura, Hirokazu; Tanida, Kiyoshi
Source
Subject
*HIGH resolution spectroscopy
*NUCLEAR reactions
*BOUND states
*DIBARYON
*EXOTIC baryons
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Language
ISSN
2101-6275
Abstract
We present a new proposal, J-PARC E90, to measure a missing-mass spectrum near the ΣN threshold for the d(K−, π−) reactions at 1.4 GeV/c. While many previous experiments support apparent enhancement near the ΣN thresh-old, the dynamical origin of this so-called "ΣN cusp" remains yet unsolved. The enhancement suggests either a cusp structure or a weakly bound state. One of the keys to making it clear is improving the missing-mass resolution and statistics. Our new experiment can achieve the missing-mass resolution of 0.4 MeV in σ using the K1.8 beam line and S-2S spectrometers at J-PARC. Further-more, we can suppress quasi-free background processes with the time projection chamber (HypTPC), which operated nicely for the H-dibaryon search experi-ment (J-PARC E42). The J-PARC E90 aims to extract the scattering length of the ΣN system with isospin T = 1/2 and spin-triplet channels. [ABSTRACT FROM AUTHOR]