First Measurement of the $K^-$ Escape Cross Section in the ${}^{12}{\rm C}(K^{-},p)$ Reaction

[2606.18398] First Measurement of the $K^-$ Escape Cross Section in the ${}^{12}{\rm C}(K^{-},p)$ Reaction Skip to main content Search Submit Donate Log in Search arXiv Press Enter to search · Advanced search Nuclear Experiment arXiv:2606.18398 (nucl-ex) [Submitted on 16 Jun 2026 ( v1 ), last revised 15 Aug 2026 (this version, v3)] Title: First Measurement of the $K^-$ Escape Cross Section in the ${}^{12}{\rm C}(K^{-},p)$ Reaction Authors: Fumiya Oura , Yudai Ichikawa , Junko Yamagata-Sekihara , Jung Keun Ahn , Sung Wook Choi , Manami Fujita , Takeshi Harada , Shoichi Hasegawa , Shuhei Hayakawa , Kenneth Hicks , Satoru Hirenzaki , Sang Hoon Hwang , Kenichi Imai , Yuji Ishikawa , Woo Seung Jung , Shunsuke Kajikawa , Kento Kamada , Byung Min Kang , Shin Hyung Kim , Tomomasa Kitaoka , Jaeyong Lee , Jong Won Lee , Koji Miwa , Taito Morino , Tamao Sakao , Hiroyuki Sako , Masayoshi Saito , Susumu Sato , Toshiyuki Takahashi , Kiyoshi Tanida , Hirokazu Tamura , Mifuyu Ukai , Shunsuke Wada , Takeshi O. Yamamoto , Seongbae Yang View a PDF of the paper titled First Measurement of the $K^-$ Escape Cross Section in the ${}^{12}{\rm C}(K^{-},p)$ Reaction, by Fumiya Oura and 34 other authors View PDF HTML (experimental) Abstract: We investigated the $\bar{K}$-nucleus interaction through the simultaneous measurement of the inclusive $^{12}{\rm C}(K^-, p)$ and exclusive $K^-$-escape $^{12}{\rm C}(K^-, p K^-_{esc})$ 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 $436 \pm 6\:(\text{stat.}) \pm 44\:(\text{syst.})~\mu\text{b/sr}$. A simultaneous likelihood fit yielded real and imaginary potential strengths of $V_0 = -72\:^{+3}_{-5}\:(\text{stat.})\:^{+0}_{-8}\:(\text{syst.})~\text{MeV}$ and $W_0 = -100\:^{+7}_{-1}\:(\text{stat.})\:^{+0}_{-16}\:(\text{syst.})~\text{MeV}$ 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. Subjects: Nuclear Experiment (nucl-ex) ; Nuclear Theory (nucl-th) Cite as: arXiv:2606.18398 [nucl-ex] (or arXiv:2606.18398v3 [nucl-ex] for this version) https://doi.org/10.48550/arXiv.2606.18398 Focus to learn more arXiv-issued DOI via DataCite Submission history From: Fumiya Oura [ view email ] [v1] Tue, 16 Jun 2026 18:42:34 UTC (1,787 KB) [v2] Fri, 24 Jul 2026 11:59:56 UTC (741 KB) [v3] Sat, 15 Aug 2026 02:18:06 UTC (741 KB) Full-text links: Access Paper: View a PDF of the paper titled First Measurement of the $K^-$ Escape Cross Section in the ${}^{12}{\rm C}(K^{-},p)$ Reaction, by Fumiya Oura and 34 other authors View PDF HTML (experimental) TeX Source view license Current browse context: nucl-ex < prev | next > new | recent | 2026-06 Change to browse by: nucl-th References & Citations INSPIRE HEP NASA ADS Google Scholar Semantic Scholar export BibTeX citation Loading... BibTeX formatted citation × loading... 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