Reconstruction and Performance Evaluation of FASER's Emulsion Detector at the LHC

作者：FASER Collaboration, Roshan Mammen Abraham, X. Ai, S. Alonso Monsalve, John Anders, Claire Antel, A. Ariga, T. Ariga, Jeremy Atkinson, F. U. Bernlochner, Tobias Boeckh, Jamie Boyd, L. Brenner, A. M. Burger, Franck Cadou, R. Cardella, D. Casper, Charlotte Cavanagh, Xin Chen, Chinone, Kohei, Dhruv Chouhan, A. Coccaro, Stephane Débieu, Ansh Desai, Sergey Dmitrievsky, Radu Dobre, Monica D'Onofrio, Sinead Eley, Yannick Favre, D. E. Fellers, Jonathan L. Feng, Carlo Alberto Fenoglio, D. Ferrère, Max Fieg, Wissal Filali, Elena Firu, Haruhi Fujimori, Edward Karl Galantay, Ali Garabaglu, S. M. Gibson, S. González-Sevilla, Y. Gornushkin, C. B. Gwilliam, D. Hayakawa, Holzbock, Michael, Shih-Chieh Hsu, Z. Hu, G. Iacobucci, Tomohiro Inada, Luca Iodice, S. Jakobsen, Hans Ludwig Joos, E. Kajomovitz, Takumi Kanai, H. Kawahara, Alex Keyken, Felix Kling, Daniela Köck, Kontaxakis, Pantelis, U. Köse, Rafaella Kotitsa, Peter Krack, Susanne Kuehn, T. Kugathasan, Lorne Levinson, Botao Li, Jinfeng Liu, Yi Liu, Margaret S. Lutz, J. C. MacDonald, Chiara Magliocca, Toni Mäkelä, Lawson McCoy, J. A. Mcfayden, Andrea Pizarro Medina, Matteo Milanesio, Théo Moretti, K. Moriyama, Mitsuhiro Nakamura, Toshiyuki Nakano, Laurie Nevay, Motoya Nonaka, Yuma Ohara, Ken Ohashi, K Okui, Hidetoshi Otono, Hao Pang, Lorenzo Paolozzi, Pawan Pawan, Brian Petersen, Titi Preda, M. T. Prim, M. Queitsch-Maitland, Juan Rojo, Hiroki Rokujo, André Rubbia, J. A. Sabater Iglesias, Osamu Sato, Paola Scampoli, Kristof Schmieden, Matthias Schott, C. Sebastiani, A. Sfyrla, D. Sgalaberna, M. Shamim, Savannah Shively, Y. Takubo, Noshin Tarannum, Ondrej Theiner, Simon Thor, E. Torrence, Oscar Ivan Valdes Martinez, Svetlana Vasina, B. Vormwald, Yuxiao Wang, Eli Welch, M. Wielers, Benjamin James Wilson, Jialin Wu, Johannes Wüthrich, Y. Xu, Stefano Zambito, Shunliang Zhang, Xingyu Zhao · 发表于：arXiv (Cornell University) · 年份：2025 · DOI：10.48550/arxiv.2504.13008 · 被引用次数：2 · 研究领域：Particle Detector Development and Performance、Particle physics theoretical and experimental studies、Neutrino Physics Research

This paper presents the reconstruction and performance evaluation of the FASER$ν$ emulsion detector, which aims to measure interactions from neutrinos produced in the forward direction of proton-proton collisions at the CERN Large Hadron Collider. The detector, composed of tungsten plates interleaved with emulsion films, records charged particles with sub-micron precision. A key challenge arises from the extremely high track density environment, reaching $\mathcal{O}(10^5)$ tracks per cm$^2$. To address this, dedicated alignment techniques and track reconstruction algorithms have been developed, building on techniques from previous experiments and introducing further optimizations. The performance of the detector is studied by evaluating the single-film efficiency, position and angular resolution, and the impact parameter distribution of reconstructed vertices. The results demonstrate that an alignment precision of 0.3 micrometers and robust track and vertex reconstruction are achieved, enabling accurate neutrino measurements in the TeV energy range.