EXCESS workshop: Descriptions of rising low-energy spectra
Prakruth Adari, A. A. Aguilar-Arevalo, D. Amidei, G. Angloher, E. Armengaud, C. Augier, Levente Balogh, S. Banik, D. Baxter, C. Beaufort, G. Beaulieu, V. Belov, Y. Ben Gal, G. Benato, Alain Benoît, A. Bento, Laurent Bergé, A Bertolini, R. Bhattacharyya, J. Billard, Itay M. Bloch, Ana Martina Botti, R. Breier, Guillaume A. Brès, J-.L. Bret, A. Broniatowski, A. Brossard, C. Bucci, R. Bunker, Mariano Cababié, M. Calvo Gomez, P. Camus, Gustavo Cancelo, L. Canonica, Fabio Cappella, L. Cardani, Jean‐François Caron, N. Casali, G. del Castello, Aurélie Cazes, R. Cerulli, Brenda A. Cervantes-Vergara, D. Chaize, M. Chapellier, L. Chaplinsky, F. Charlieux, M. Chaudhuri, Á. Chavarría, G. Chemin, Ran Chen, Hao Chen, Fernando Chierchie, I. Colantoni, J. Colas, J. Cooley, J.-M. Coquillat, Emily Corcoran, Stephen S. Crawford, M. B. Crisler, A. Cruciani, Priscilla Cushman, A. D’Addabbo, Juan Carlos D’Olivo, A. Dastgheibi-Fard, M. De Jésus, Yanqing Deng, James B. Dent, Eliana Depaoli, K. Dering, Sukeerthi Dharani, S. Di Lorenzo, A. Drlica-Wagner, Louis Dumoulin, Daniel Durnford, Bhaskar Dutta, L. Einfalt, Anna Erb, A. Erhart, Rouven Essig, J. Estrada, Erez Etzion, O. Exshaw, F. Favela-Pérez, F. von Feilitzsch, Guillermo Fernández Moroni, N. Ferreiro Iachellini, S. Ferriol, S. Fichtinger, E. Figueroa‐Feliciano, J.-B. Filippini, Dmitry Filosofov, J. A. Formaggio, M. Friedl, S. Fuard, D. Fuchs, Alexander Fuss, R. Gaïor, Abhijit Garai, C. Garrah, J. Gascon
Abstract
Many low-threshold experiments observe sharply rising event rates of yet unknown origins below a few hundred eV, and larger than expected from known backgrounds. Due to the significant impact of this excess on the dark matter or neutrino sensitivity of these experiments, a collective effort has been started to share the knowledge about the individual observations. For this, the EXCESS Workshop was initiated. In its first iteration in June 2021, ten rare event search collaborations contributed to this initiative via talks and discussions. The contributing collaborations were CONNIE, CRESST, DAMIC, EDELWEISS, MINER, NEWS-G, NUCLEUS, RICOCHET, SENSEI and SuperCDMS. They presented data about their observed energy spectra and known backgrounds together with details about the respective measurements. In this paper, we summarize the presented information and give a comprehensive overview of the similarities and differences between the distinct measurements. The provided data is furthermore publicly available on the workshop's data repository together with a plotting tool for visualization.