寄稿文（Essay）
Miku Tsujii (Department of Astronomy, Graduate School of Science, Tohoku University) June, 2025
I participated in the LOW TEMPERATURE DETECTORS CONFERENCE 2025, held from June 1st to 6th. This conference was a valuable venue where cutting-edge technologies in low-temperature detectors gathered, and it was my first time attending. At the conference, I had the opportunity to interact with researchers from various fields. The most interesting thing was the diversity of challenges and solution approaches specific to each field, even while dealing with the same physical phenomena. My first time in the United States was really enjoyable. The museums and historical buildings I visited during breaks from the conference provided opportunities to experience the rich cultural background of this country firsthand.
Ryuta Saito (Department of Physics, Graduate School of Science, Tohoku University) April 2025
2025年4月14日から17日にかけて、ブルガリアのソフィア大学で開催されたFemTUM2025に参加し、カスプ分光法に関する口頭発表を行いました。このワークショップは、ハドロン間相互作用を特徴付ける物理量でる散乱長の測定手法として最近注目を集めているフェムトスコピーに関するものでした。私が取り組んでいるカスプ分光法は、2粒子の質量閾値近傍に現れる特徴的な構造（閾値カスプ）の形状から散乱長を導き出す手法です。今回のワークショップでは、この手法に興味を持ってくださった現地の研究者から声をかけていただき、紹介する機会を得ました。初めての招待講演で緊張もありましたが、手法の有用性や新規性を伝えることができたと思います。フェムトスコピーの解析でも類似の構造が確認されており、今後の共同研究につながる有意義な海外出張となりました。
From April 14 to 17, 2025, I participated in FemTUM2025, an international workshop held at Sofia University in Bulgaria, and gave an oral presentation on cusp spectroscopy. This workshop focused on femtoscopy, a technique that has recently attracted attention as a method for measuring scattering lengths—quantities that characterize hadron-hadron interactions. My research theme is cusp spectroscopy, a method that extracts the scattering length from the shape of the threshold cusp that appears near the mass threshold of two particles. At the workshop, I was invited to present this approach by local researchers who showed interest in it. Although it was my first invited talk and I was quite nervous, I think I was able to convey the novelty and significance of the method. Cusp-like structures have also been observed in femtoscopy analyses, and I found this trip to be a valuable opportunity that may lead to future collaborations.
