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Title A new direct detection electron scattering experiment to search for the X17 particle
Authors Dipangkar Dutta, Haiyan Gao, Ashot Gasparian, Tyler James Hague, Nilanga Liyanage, Rafayel Paremuzyan, Chao Peng, Dunxiong Wang, Patrick Achenbach, Abdellah Ahmidouch, Salina Ali, H. Avakian, C. Ayerbe-Gayoso, Xinzhan Bai, Marco Battaglieri, Hem Bhatt, Andrea Bianconi, John Boyd, Duane Byer, Philip Cole, Giovanni Costantini, Shakeila Davis, Marzio De Napoli, Raffaella De Vita, Bhesha Devkota, James Dunne, Lamiaa El Fassi, Vimukthi Haththotuwa Gamage, Liping Gan, Kondo Gnanvo, Giulia Gosta, Douglas Higinbotham, C. Howell, Sean Jeffas, Siyu Jian, Abishek Karki, B. Karki, V. Khachatryan, Mahbub Khandaker, Valery Kubarovsky, Ilya Larin, Marco Leali, Valerio Mascagna, Gregory Matousek, Stefano Migliorati, Rory Miskimen, Prajwal MohanMurthy, Huong Nguyen, Eugene Pasyuk, Anuruddha Rathnayake Mudiyanselage, Jennifer Rittenhouse West, A. Shahinyan, Andrew Smith, Armenak Stepanyan, E. van Nieuwenhuizen, Luca Venturelli, Bo Yu, Zhiwen Zhao, Jingyi Zhou
JLAB number JLAB-PHY-23-3740
LANL number arXiv:2301.08768
Other number DOE/OR/23177-5705
Document Type(s) (Journal Article) 
Associated with EIC: No
Supported by Jefferson Lab LDRD Funding: No
Funding Source: Nuclear Physics (NP)

Compiled for arXiv
Publication Abstract: A new electron scattering experiment (E12-21-003) [1] to verify and understand the nature of hidden sector particles, with particular emphasis on the so-called X17 particle, has been approved at Jefferson Lab. The search for these particles is motivated by new hidden sector models introduced to account for a variety of experimental and observational puzzles: excess in e +e ? pairs observed in multiple nuclear transitions, the 4.2? disagreement between experiments and the standard model prediction for the muon anomalous magnetic moment, and the small-scale structure puzzle in cos?mological simulations. The aforementioned X17 particle has been hypothesized to account for the excess in e +e ? pairs observed from the 8Be M1, 4He M0, and, most recently, 12C E1 nuclear tran?sitions to their ground states observed by the ATOMKI group. This experiment will use a high resolution electromagnetic calorimeter to search for or set new limits on the production rate of the X17 and other hidden sector particles in the 3 ? 60 MeV mass range via their e +e ? decay (or ?? decay with limited tracking). In these models, the 1 ? 100 MeV mass range is particularly well?motivated and the lower part of this range still remains unexplored. Our proposed direct detection experiment will use a magnetic-spectrometer-free setup (the PRad apparatus) to detect all three final state particles in the visible decay of a hidden sector particle allowing for an effective control of the background and will cover the proposed mass range in a single setting. The use of the well?demonstrated PRad setup allows for an essentially ready-to-run and uniquely cost-effective search for hidden sector particles in the 3 ? 60 MeV mass range with a sensitivity of 8.9×10?8 - 5.8×10?9 to ? 2, the square of the kinetic mixing interaction constant between hidden and visible sectors
Experiment Numbers: E12-21-003
Group: Hall B
Document: pdf
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