First Measurement of the K- Escape Cross Section in the 12C(K−,p) Reaction
Abstract
We investigated the K̅-nucleus interaction through the simultaneous measurement of the inclusive 12C(K-, p) and exclusive K--escape 12C(K-, p K-esc) reactions at $1.8$ GeV/c at J-PARC. The present measurement explicitly focuses on the K- escape process for the first time, successfully accomplishing a direct experimental determination of the imaginary part of the K- optical potential. The differential cross section for the K--escape reaction was determined to be 436 ± 6 (stat.) ± 44 (syst.) μb/sr. A simultaneous likelihood fit yielded real and imaginary potential strengths of V0 = −72 +3−5 (stat.) +0−8 (syst.) MeV and W0 = −100 +7−1 (stat.) +0−16 (syst.) MeV at the nuclear center, respectively. The derived W0 is significantly stronger than that predicted by theoretical models based on one-nucleon processes, suggesting possible contribution of multi-nucleon involving processes.
Versions
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BibTeX
@misc{oura2026first,
title = {{First Measurement of the $K^-$ Escape Cross Section in the $^12\rm C(K^-,p)$ Reaction}},
author = {Fumiya Oura and Yudai Ichikawa and Junko Yamagata-Sekihara and Jung Keun Ahn and Sung Wook Choi and Manami Fujita and Takeshi Harada and Shoichi Hasegawa and Shuhei Hayakawa and Kenneth Hicks and Satoru Hirenzaki and Sang Hoon Hwang and Kenichi Imai and Yuji Ishikawa and Woo Seung Jung and Shunsuke Kajikawa and Kento Kamada and Byung Min Kang and Shin Hyung Kim and Tomomasa Kitaoka and Jaeyong Lee and Jong Won Lee and Koji Miwa and Taito Morino and Tamao Sakao and Hiroyuki Sako and Masayoshi Saito and Susumu Sato and Toshiyuki Takahashi and Kiyoshi Tanida and Hirokazu Tamura and Mifuyu Ukai and Shunsuke Wada and Takeshi O. Yamamoto and Seongbae Yang},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2606.18398},
eprint = {2606.18398},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2606.18398},
}
RIS
TY - UNPB
TI - First Measurement of the K^- Escape Cross Section in the ^12C(K^−,p) Reaction
AU - Fumiya Oura
AU - Yudai Ichikawa
AU - Junko Yamagata-Sekihara
AU - Jung Keun Ahn
AU - Sung Wook Choi
AU - Manami Fujita
AU - Takeshi Harada
AU - Shoichi Hasegawa
AU - Shuhei Hayakawa
AU - Kenneth Hicks
AU - Satoru Hirenzaki
AU - Sang Hoon Hwang
AU - Kenichi Imai
AU - Yuji Ishikawa
AU - Woo Seung Jung
AU - Shunsuke Kajikawa
AU - Kento Kamada
AU - Byung Min Kang
AU - Shin Hyung Kim
AU - Tomomasa Kitaoka
AU - Jaeyong Lee
AU - Jong Won Lee
AU - Koji Miwa
AU - Taito Morino
AU - Tamao Sakao
AU - Hiroyuki Sako
AU - Masayoshi Saito
AU - Susumu Sato
AU - Toshiyuki Takahashi
AU - Kiyoshi Tanida
AU - Hirokazu Tamura
AU - Mifuyu Ukai
AU - Shunsuke Wada
AU - Takeshi O. Yamamoto
AU - Seongbae Yang
PY - 2026
DA - 2026/09/22
PB - arXiv
DO - 10.48550/arxiv.2606.18398
UR - https://arxiv.org/abs/2606.18398
AB - We investigated the K̅-nucleus interaction through the simultaneous measurement of the inclusive ^12C(K^-, p) and exclusive K^--escape ^12C(K^-, p K^-_esc) reactions at $1.8$ GeV/c at J-PARC. The present measurement explicitly focuses on the K^- escape process for the first time, successfully accomplishing a direct experimental determination of the imaginary part of the K^- optical potential. The differential cross section for the K^--escape reaction was determined to be 436 ± 6 (stat.) ± 44 (syst.) μb/sr. A simultaneous likelihood fit yielded real and imaginary potential strengths of V_0 = −72 ^+3_−5 (stat.) ^+0_−8 (syst.) MeV and W_0 = −100 ^+7_−1 (stat.) ^+0_−16 (syst.) MeV at the nuclear center, respectively. The derived W_0 is significantly stronger than that predicted by theoretical models based on one-nucleon processes, suggesting possible contribution of multi-nucleon involving processes.
ER -