☆ 4.5 Article

Improved Search for Neutron to Mirror-Neutron Oscillations in the Presence of Mirror Magnetic Fields with a Dedicated Apparatus at the PSI UCN Source

SYMMETRY-BASEL (2022)

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SYMMETRY-BASEL
卷 14, 期 3, 页码 -

出版社

MDPI
DOI: 10.3390/sym14030503

关键词

mirror neutron; ultracold neutron; neutron oscillation; mirror magnetic field

类别

Multidisciplinary Sciences

资金

  1. ETH Career Seed Grant [SEED-13 20-2]
  2. SNF spark programme [CRSK-2_196416]
  3. National Science Centre, Poland [2016/23/D/ST2/00715, 2018/30/M/ST2/00319, 2020/37/B/ST2/02349]
  4. Flemish Science Foundation FWO [G0D0421N]
  5. MIUR Grant under the PRIN 2017 program [2017X7X85K]
  6. SRNSF [DI-18-335]
  7. Swiss National Science Foundation (SNF) [CRSK-2_196416] Funding Source: Swiss National Science Foundation (SNF)

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The Paul Scherrer Institut (PSI) is conducting a new study on neutron to mirror-neutron oscillations using stored ultracold neutrons. The experiment features a large storage vessel to enhance statistical sensitivity. With the demonstrated performance, the study aims to detect or exclude potential signals consistent with neutron to mirror-neutron oscillations.
While the international nEDM collaboration at the Paul Scherrer Institut (PSI) took data in 2017 that covered a considerable fraction of the parameter space of claimed potential signals of hypothetical neutron (n) to mirror-neutron (n') transitions, it could not test all claimed signal regions at various mirror magnetic fields. Therefore, a new study of n - n' oscillations using stored ultracold neutrons (UCNs) is underway at PSI, considerably expanding the reach in parameter space of mirror magnetic fields (B') and oscillation time constants (tau(nn')). The new apparatus is designed to test for the anomalous loss of stored ultracold neutrons as a function of an applied magnetic field. The experiment is distinguished from its predecessors by its very large storage vessel (1.47 m(3)), enhancing its statistical sensitivity. In a test experiment in 2020 we have demonstrated the capabilities of our apparatus. However, the full analysis of our recent data is still pending. Based on already demonstrated performance, we will reach sensitivity to oscillation times tau(nn')/root cos(beta) well above a hundred seconds, with beta being the angle between B' and the applied magnetic field B. The scan of B will allow the finding or the comprehensive exclusion of potential signals reported in the analysis of previous experiments and suggested to be consistent with neutron to mirror-neutron oscillations.

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Article Physics, Multidisciplinary

First Dark Matter Search with Nuclear Recoils from the XENONnT Experiment

E. Aprile, K. Abe, F. Agostini, S. Ahmed Maouloud, L. Althueser, B. Andrieu, E. Angelino, J. R. Angevaare, V. C. Antochi, D. Anton Martin, F. Arneodo, L. Baudis, A. L. Baxter, M. Bazyk, L. Bellagamba, R. Biondi, A. Bismark, E. J. Brookes, A. Brown, S. Bruenner, G. Bruno, R. Budnik, T. K. Bui, C. Cai, J. M. R. Cardoso, D. Cichon, A. P. Cimental Chavez, A. P. Colijn, J. Conrad, J. J. Cuenca-Garcia, J. P. Cussonneau, V D'Andrea, M. P. Decowski, P. Di Gangi, S. Di Pede, S. Diglio, K. Eitel, A. Elykov, S. Farrell, A. D. Ferella, C. Ferrari, H. Fischer, M. Flierman, W. Fulgione, C. Fuselli, P. Gaemers, R. Gaior, A. Gallo Rosso, M. Galloway, F. Gao, R. Glade-Beucke, L. Grandi, J. Grigat, H. Guan, M. Guida, R. Hammann, A. Higuera, C. Hils, L. Hoetzsch, N. F. Hood, J. Howlett, M. Iacovacci, Y. Itow, J. Jakob, F. Joerg, A. Joy, N. Kato, M. Kara, P. Kavrigin, S. Kazama, M. Kobayashi, G. Koltman, A. Kopec, F. Kuger, H. Landsman, R. F. Lang, L. Levinson, I. Li, S. Li, S. Liang, S. Lindemann, M. Lindner, K. Liu, J. Loizeau, F. Lombardi, J. Long, J. A. M. Lopes, Y. Ma, C. Macolino, J. Mahlstedt, A. Mancuso, L. Manenti, F. Marignetti, T. Marrodan Undagoitia, K. Martens, J. Masbou, D. Masson, E. Masson, S. Mastroianni, M. Messina, K. Miuchi, K. Mizukoshi, A. Molinario, S. Moriyama, K. Mora, Y. Mosbacher, M. Murra, J. Mueller, K. Ni, U. Oberlack, B. Paetsch, J. Palacio, R. Peres, C. Peters, J. Pienaar, M. Pierre, V. Pizzella, G. Plante, J. Qi, J. Qin, D. Ramirez Garcia, R. Singh, L. Sanchez, J. M. F. dos Santos, I. Sarnoff, G. Sartorelli, J. Schreiner, D. Schulte, P. Schulte, H. Schulze Eissing, M. Schumann, L. Scotto Lavina, M. Selvi, F. Semeria, P. Shagin, S. Shi, E. Shockley, M. Silva, H. Simgen, A. Takeda, P. -L. Tan, A. Terliuk, D. Thers, F. Toschi, G. Trinchero, C. Tunnell, F. Toennies, K. Valerius, G. Volta, C. Weinheimer, M. Weiss, D. Wenz, C. Wittweg, T. Wolf, V. H. S. Wu, Y. Xing, D. Xu, Z. Xu, M. Yamashita, L. Yang, J. Ye, L. Yuan, G. Zavattini, M. Zhong, T. Zhu

Summary: This study reports on the first search for nuclear recoils from dark matter in the form of weakly interacting massive particles (WIMPs) using the XENONnT experiment. The results show no significant excess of events in the designated energy range. The study provides a minimum upper limit on the spin-independent WIMP-nucleon cross section and presents limits for spin dependent interactions.

PHYSICAL REVIEW LETTERS (2023)

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Article Physics, Particles & Fields

Minimally modified Fritzsch texture for quark masses and CKM mixing

Benedetta Belfatto, Zurab Berezhiani

Summary: The paper discusses the origin of fermion mass hierarchies and mixing patterns and proposes a modification to explain the relations between fermion masses and mixing angles. By introducing an asymmetry between the 23 and 32 entries in the down-quark Yukawa matrix, the paper shows that this flavor structure can naturally emerge in models with inter-family SU(3)(H) symmetry, and its predictions are compatible with experimental data.

JOURNAL OF HIGH ENERGY PHYSICS (2023)

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Article Physics, Particles & Fields

Borexino's search for low-energy neutrinos associated with gravitational wave events from GWTC-3 database

D. Basilico, G. Borexino Collaboration, G. Bellini, J. Benziger, R. Biondi, B. Caccianiga, F. Calaprice, A. Caminata, A. Chepurnov, D. D'Angelo, A. Derbin, A. Di Giacinto, V. Di Marcello, X. F. Ding, A. Di Ludovico, L. Di Noto, I. Drachnev, D. Franco, C. Galbiati, C. Ghiano, M. Giammarchi, A. Goretti, M. Gromov, D. Guffanti, Aldo Ianni, Andrea Ianni, A. Jany, V. Kobychev, G. Korga, S. Kumaran, M. Laubenstein, E. Litvinovich, P. Lombardi, I. Lomskaya, L. Ludhova, I. Machulin, J. Martyn, E. Meroni, L. Miramonti, M. Misiaszek, V. Muratova, R. Nugmanov, L. Oberauer, V. Orekhov, F. Ortica, M. Pallavicini, L. Pelicci, O. Penek, L. Pietrofaccia, N. Pilipenko, A. Pocar, G. Raikov, M. T. Ranalli, G. Ranucci, A. Re, N. Rossi, S. Schoenert, D. Semenov, G. Settanta, M. Skorokhvatov, A. Singhal, O. Smirnov, A. Sotnikov, R. Tartaglia, G. Testera, E. Unzhakov, A. Vishneva, R. B. Vogelaar, F. von Feilitzsch, M. Wojcik, M. Wurm, S. Zavatarelli, K. Zuber, G. Zuzel

Summary: A search for neutrino events in correlation with gravitational wave (GW) events was conducted using the Borexino data-set for three observing runs (O1, O2, and O3) from 09/2015 to 03/2020. The search involved looking for signals of neutrino-electron scattering and inverse beta-decay (IBD) within a time window of +/- 1000 s centered at the detection moment of a GW event. Different visible energy thresholds and incoming neutrino spectra were considered, and various types of GW candidates were analyzed. No statistically significant excess over the background was observed, and the strongest upper limits on GW-associated neutrino fluences were obtained.

EUROPEAN PHYSICAL JOURNAL C (2023)

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Article Physics, Particles & Fields

Liquid argon light collection and veto modeling in GERDA Phase II

M. Agostini, A. Alexander, G. R. Araujo, A. M. Bakalyarov, M. Balata, I. Barabanov, L. Baudis, C. Bauer, S. Belogurov, A. Bettini, L. Bezrukov, V. Biancacci, E. Bossio, V. Bothe, R. Brugnera, A. Caldwell, S. Calgaro, C. Cattadori, A. Chernogorov, P. -J. Chiu, T. Comellato, V. D'Andrea, E. V. Demidova, A. Di Giacinto, N. Di Marco, E. Doroshkevich, F. Fischer, M. Fomina, A. Gangapshev, A. Garfagnini, C. Gooch, P. Grabmayr, V. Gurentsov, K. Gusev, J. Hakenmueller, S. Hemmer, W. Hofmann, M. Hult, L. V. Inzhechik, J. Janicsko Csathy, J. Jochum, M. Junker, V. Kazalov, Y. Kermaidic, H. Khushbakht, T. Kihm, K. Kilgus, I. V. Kirpichnikov, A. Klimenko, K. T. Knoepfle, O. Kochetov, V. N. Kornoukhov, P. Krause, V. V. Kuzminov, M. Laubenstein, B. Lehnert, M. Lindner, I. Lippi, A. Lubashevskiy, B. Lubsandorzhiev, G. Lutter, C. Macolino, B. Majorovits, W. Maneschg, L. Manzanillas, G. Marshall, M. Miloradovic, R. Mingazheva, M. Misiaszek, M. Morella, Y. Mueller, I. Nemchenok, M. Neuberger, L. Pandola, K. Pelczar, L. Pertoldi, P. Piseri, A. Pullia, L. Rauscher, M. Redchuk, S. Riboldi, N. Rumyantseva, C. Sada, S. Sailer, F. Salamida, S. Schoenert, J. Schreiner, M. Schuett, A. -K Schuetz, O. Schulz, M. Schwarz, B. Schwingenheuer, O. Selivanenko, E. Shevchik, M. Shirchenko, L. Shtembari, H. Simgen, A. Smolnikov, D. Stukov, S. Sullivan, A. A. Vasenko, A. Veresnikova, C. Vignoli, K. von Sturm, A. Wegmann, T. Wester, C. Wiesinger, M. Wojcik, E. Yanovich, B. Zatschler, I. Zhitnikov, S. V. Zhukov, D. Zinatulina, A. Zschocke, A. J. Zsigmond, K. Zuber, G. Zuzel

Summary: The GERDA experiment achieved an exceptionally low background rate in the search for neutrinoless double beta decay of Ge-76 by detecting liquid argon scintillation light from within a densely packed high-purity germanium detector array. Modeling the light propagation throughout the experimental setup and its detection by the novel light read-out system is crucial for rejection capability and robust background predictions. This paper presents a model of the GERDA liquid argon veto obtained through Monte Carlo simulations and calibration data, highlighting its application for background decomposition.

EUROPEAN PHYSICAL JOURNAL C (2023)

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Article Physics, Particles & Fields

Search for tri-nucleon decays of 76Ge in GERDA

M. GERDA Collaboration, M. Agostini, A. Alexander, G. Araujo, A. M. Bakalyarov, M. Balata, I. Barabanov, L. Baudis, C. Bauer, S. Belogurov, A. Bettini, L. Bezrukov, V. Biancacci, E. Bossio, V. Bothe, R. Brugnera, A. Caldwell, S. Calgaro, C. Cattadori, A. Chernogorov, P. -j. Chiu, T. Comellato, V. D'Andrea, E. V. Demidova, A. Di Giacinto, N. Di Marco, E. Doroshkevich, F. Fischer, M. Fomina, A. Gangapshev, A. Garfagnini, C. Gooch, P. Grabmayr, V. Gurentsov, K. Gusev, J. Hakenmueller, S. Hemmer, W. Hofmann, M. Hult, L. V. Inzhechik, J. Janicsko Csathy, J. Jochum, M. Junker, V. Kazalov, Y. Kermaidic, H. Khushbakht, T. Kihm, K. Kilgus, I. V. Kirpichnikov, A. Klimenko, K. T. Knoepfle, O. Kochetov, V. N. Kornoukhov, P. Krause, V. V. Kuzminov, M. Laubenstein, M. Lindner, I. Lippi, A. Lubashevskiy, B. Lubsandorzhiev, G. Lutter, C. Macolino, B. Majorovits, W. Maneschg, L. Manzanillas, G. Marshall, M. Misiaszek, M. Morella, Y. Mueller, I. Nemchenok, M. Neuberger, L. Pandola, K. Pelczar, L. Pertoldi, P. Piseri, A. Pullia, L. Rauscher, M. Redchuk, S. Riboldi, N. Rumyantseva, C. Sada, S. Sailer, F. Salamida, S. Schoenert, J. Schreiner, M. Schuett, A. -k. Schuetz, O. Schulz, M. Schwarz, B. Schwingenheuer, O. Selivanenko, E. Shevchik, M. Shirchenko, L. Shtembari, H. Simgen, A. Smolnikov, D. Stukov, S. Sullivan, A. A. Vasenko, A. Veresnikova, C. Vignoli, K. von Sturm, T. Wester, C. Wiesinger, M. Wojcik, E. Yanovich, B. Zatschler, I. Zhitnikov, S. V. Zhukov, D. Zinatulina, A. Zschocke, A. J. Zsigmond, K. Zuber, G. Zuzel

Summary: We searched for tri-nucleon decays of Ge-76 in the GERDA experiment dataset, and placed a lower limit on the lifetime of these decays by analyzing the sum of the decay widths.

EUROPEAN PHYSICAL JOURNAL C (2023)

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Article Physics, Nuclear

Characterization of ultracold neutron production in thin solid deuterium films at the PSI Ultracold Neutron source

G. Bison, B. Blau, W. Chen, P. -j. Chiu, M. Daum, C. B. Doorenbos, N. Hild, K. Kirch, V. Kletzl, B. Lauss, D. Pais, I. Rienacker, D. Ries, P. Schmidt-Wellenburg, V. Talanov, G. Zsigmond

Summary: In this study, we determined the production rate of ultracold neutrons (UCN) through superthermal conversion in a solid deuterium (sD2) moderator at the UCN source at the Paul Scherrer Institute (PSI). We found that a low amount of deuterium deposited on the moderator surfaces had a negligible effect on the UCN yield. By comparing calculated UCN yield with measurements, we confirmed our results and provided an absolute characterization of UCN production and transport in the source.

PHYSICAL REVIEW C (2023)

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