EXCESS workshop: Descriptions of rising low-energy spectra
Authors: Adari Prakruth , Aguilar-Arevalo Alexis A. , Amidei Dante , Angloher G. , Armengaud Eric , Augier C. , Balogh Levente , Banik S. , Baxter David , Beaufort C. , Beaulieu G. , Belov V. , Ben Gal Y. , Benato Giovanni , Benoît Alain , Bento Antonio , Bergé Laurent , Bertolini Andrea , Bhattacharyya R. , Billard J. , Bloch Itay M. , Botti A. , Breier Robert , Bres G. , Bret J-.L. , Broniatowski A. , Brossard Alexis , Bucci Carlo , Bunker Raymond , Cababie M. , Calvo M. , Camus P. , Cancelo G. , Canonica Lucia , Cappella Fabio , Cardani Laura , Caron Jean-François , Casali N. , del Castello G. , Cazes Aurélie , Cerulli Riccardo , Cervantes Vergara B.A. , Chaize D. , Chapellier M. , Chaplinsky L. , Charlieux F. , Chaudhuri M. , Chavarria Alvaro E. , Chemin G. , Chen Ran , Chen Hao , Chierchie F. , Colantoni I. , Colas J. , Cooley Jodi , Coquillat Jean-Marie , Corcoran Emily , Crawford S. , Crisler Michael , Cruciani Angelo , Cushman Priscilla , D'Addabbo Antonio , D'Olivo Juan Carlos , Dastgheibi-Fard A. , De Jésus Maria , Deng Y. , Dent James , Depaoli Eliana , Dering Koby , Dharani Sukeerthi , Di Lorenzo S. , Drlica-Wagner Alex , Dumoulin Louis , Durnford Daniel , Dutta Bhaskar , Einfalt L. , Erb Anna , Erhart A. , Essig Rouven , Estrada Juan , Etzion Erez , Exshaw O. , Favela-Perez F. , von Feilitzsch F. , Fernandez Moroni Guillermo , Ferreiro Iachellini Nahuel , Ferriol S. , Fichtinger S. , Figueroa-Feliciano Enectalí , Filippini J.-B. , Filosofov Dmitry , Formaggio Joseph A. , Friedl Markus , Fuard S. , Fuchs Dominik , Fuss Alexander , Gaïor R. , Garai Abhijit , Garrah Carter , Gascon J. , Gerbier Gilles , Ghaith Muad , Ghete V. M. , Gift Daniel , Giomataris I. , Giroux Guillaume , Giuliani A. , Gorel Pierre , Gorla Paolo , Goupy C. , Goupy J. , Goy C. , Gros M. , Gros Philippe , Guardincerri Yann , Guerin C. , Guidi Vincenzo , Guillaudin O. , Gupta S. , Guy E. , Harrington Patrick , Hauff D. , Heine S. T. , Hertel Scott A. , Holland Stephen , Hong Z. , Hoppe Eric W. , Hossbach Todd W. , Ianigro J.-C. , Iyer Vivek , Jastram Andrew , Ješkovský Miroslav , Jin Y. , Jochum Josef , Johnston J. P. , Juillard A. , Karaivanov Dimitar , Kashyap V. , Katsioulas Ioannis , Kazarcev S. , Kaznacheeva Margarita , Kelly Fiona , Kilminster B. , Kinast Angelina , Klinkenberg L. , Kluck Holger , Knights Patrick , Korn Yaron , Kraus Hans , von Krosigk Belina , Kubik Andrew , Kurinsky Noah , Lamblin Jacob , Langenkämper Alexander , Langrock S. , Lasserre Thierry , Lattaud H. , Lautridou P. , Lawson Ian , Lee S.-J. , Lee M. , Letessier-Selvon Antoine , Lhuillier D. , Li M. , Lin Y.-T. , Lubashevskiy Alexey , Mahaparta Rupak , Maludze Sandro , Mancuso Michele , Manthos Ioannis , Marini Laura , Marnieros S. , Martin Ryan D. , Matalon Ariel , Matthews J. , Mauri B. , Mayer D. W. , Mazzolari Andrea , Mazzucato E. , Meyer zu Theenhausen Hanno , Michielin E. , Minet J. , Mirabolfathi Nader , v. Mirbach K. , Misiak Dimitri , Mitra P. , Mocellin J.-L. , Mohanty Bedangadas , Mokina Valentyna , Mols J.-P. , Monfardini Alessandro , Mounier F. , Munagavalasa Sravan , Muraz Jean-François , Navick X.-F. , Neep Thomas , Neog Himangshu , Neyrial H. , Nikolopoulos Kostas , Nilima Athoy , Nones C. , Novati Valentina , O'Brien Paul , Oberauer L. , Olivieri E. , Olmi Alessandro , Onillon A. , Oriol C. , Orly A. , Orrell John L. , Ortmann T. , Overman C. T. , Pagliarone Carmine Elvezio , Palušová Veronika , Pari P. , Patel P. K. , Pattavina Luca , Petricca Federica , Piers Alexander , Pinckney Harold D. , Piro Marie-Cécile , Platt Mark , Poda D. , Ponomarev Dmitry , Potzel Walter , Povinec Pavel , Pröbst F. , Privitera P. , Pucci F. , Ramanathan K. , Real J.-S. , Redon T. , Reindl Florian , Ren R. , Robert Adeline , Da Rocha Julia , Rodrigues D. , Rogly R. , Rothe Johannes , Rowe Noah , Rozov Sergey , Rozova I. , Saab Tarek , Saffold Nathan , Salagnac T. , Sander Joel , Sanglard Veronique , Santos D. , Sarkis Youssef , Savu V. , Savvidis G. , Savvidis I. , Schönert S. , Schäffner Karoline , Schermer Nicole , Schieck Jochen , Schmidt Benjamin , Schmiedmayer D. , Schwertner C. , Scola L. , Settimo Mariangela , Shevchik Ye. , Sibille Valérian , Sidelnik Ivan , Singal Aman , Smida Radomir , Sofo Haro Miguel , Soldner Torsten , Stachurska Juliana , Stahlberg Martin , Stefanazzi Leandro , Stodolsky Leo , Strandhagen Christian , Strauss R. , Stutz A. , Thomas R. , Thompson A. , Tiffenberg Javier , Tomei Claudia , Traina M. , Uemura Sho , Usherov I. , Vagneron L. , Van De Pontseele Wouter , Vázquez de Sola Fernández Francisco Andrés , Vidal M. , Vignati M. , Virto A. L. , Vivier M. , Volansky Tomer , Wagner V. , Wagner Felix , Walker Joel , Ward R. , Watkins Samuel L. , Wex A. , Willers Michael , Wilson M. J. , Winslow Lindley , Yakushev Evgeny , Yu T.-T. , Zampaolo M. , Zaytsev Alexander , Zema Vanessa , Zinatulina Daniya , Zolotarova A. 
Published: August 2022

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.