SENSEI: First Direct-Detection Results on sub-GeV Dark Matter from SENSEI at SNOLAB

• DOI: 10.48550/arxiv.2312.13342
• Publication Date: 2023-01-01
• Authors: SENSEI Collaboration; Prakruth Adari; Itay M. Bloch; Ana Martina Botti; Mariano Cababié; Gustavo Cancelo; Brenda A. Cervant...; M. B. Crisler; M. Daal; Ansh Desai; A. Drlica-Wagner; Rouven Essig; Juan Estrada; E. Etzion; Guillermo Fernánd...; S. Holland; Yonatan Kehat; Yaron Korn; Ian Lawson; Steffon Luoma; Aviv Orly; Santiago Pérez; Darío Rodrígues; N. Saffold; S. Scorza; Aman Singal; Miguel Sofo-Haro; Leandro Stefanazzi; Kelly Stifter; J. Tiffenberg; Sho Uemura; Edgar Marrufo Vil...; Tomer Volansky; Yikai Wu; T. Yu; Timón Emken; Hailin Xu
• Keywords: High Energy Physics - Phenomenology; High Energy Physics - Experiment (hep-ex); Physics - Instrumentation and Detectors; Cosmology and Nongalactic Astrophysics (astro-ph.CO); High Energy Physics - Phenomenology (hep-ph); FOS: Physical sciences; Instrumentation and Detectors (physics.ins-det); Astrophysics - Cosmology and Nongalactic Astrophysics; High Energy Physics - Experiment

We present the first results from a dark matter search using six Skipper-CCDs in SENSEI detector operating at SNOLAB. With an exposure of 534.9 gram-days well-performing sensors, we select events containing 2 to 10 electron-hole pairs. After aggressively masking images remove backgrounds, observe 55 two-electron events, 4 three-electron and no electrons. The are consistent with pileup one-electron events. Among appear pixels that likely impacted by defects, although not strongly enough trigger our "hot-pixel" mask. use these data set world-leading constraints on sub-GeV interacting electrons nuclei.