Search for Heavy Neutral Leptons in Electron-Positron and Neutral-Pion Final States with the MicroBooNE Detector
P. Abratenko,O. Alterkait,Aldana D. Andrade,L. Arellano,J. Asaadi,A. Ashkenazi,S. Balasubramanian,B. Baller,G. Barr,D. Barrow,J. Barrow,V. Basque,O. Benevides Rodrigues,S. Berkman,A. Bhanderi,A. Bhat,M. Bhattacharya,M. Bishai,A. Blake,B. Bogart,T. Bolton,J. Y. Book,M. B. Brunetti,L. Camilleri,Y. Cao,D. Caratelli,F. Cavanna,G. Cerati,A. Chappell,Y. Chen,J. M. Conrad,M. Convery,L. Cooper-Troendle,J. I. Crespo-Anadon,R. Cross,M. Del Tutto,S. R. Dennis,P. Detje,A. Devitt,R. Diurba,Z. Djurcic,R. Dorrill,K. Duffy,S. Dytman,B. Eberly,P. Englezos,A. Ereditato,J. J. Evans,R. Fine,O. G. Finnerud,W. Foreman,B. T. Fleming,D. Franco,A. P. Furmanski,F. Gao,D. Garcia-Gamez,S. Gardiner,G. Ge,S. Gollapinni,E. Gramellini,P. Green,H. Greenlee,L. Gu,W. Gu,R. Guenette,P. Guzowski,L. Hagaman,O. Hen,C. Hilgenberg,G. A. Horton-Smith,Z. Imani,B. Irwin,M. Ismail,C. James,X. Ji,J. H. Jo,R. A. Johnson,Y. -J. Jwa,D. Kalra,N. Kamp,G. Karagiorgi,W. Ketchum,M. Kirby,T. Kobilarcik,I. Kreslo,M. B. Leibovitch,I. Lepetic,J. -Y. Li,K. Li,Y. Li,K. Lin,B. R. Littlejohn,H. Liu,W. C. Louis,X. Luo,C. Mariani,D. Marsden,J. Marshall,N. Martinez,D. A. Martinez Caicedo,S. Martynenko,A. Mastbaum,I. Mawby,N. McConkey,V. Meddage,J. Micallef,K. Miller,A. Mogan,T. Mohayai,M. Mooney,A. F. Moor,C. D. Moore,L. Mora Lepin,M. M. Moudgalya,S. Mulleriababu,D. Naples,A. Navrer-Agasson,N. Nayak,M. Nebot-Guinot,J. Nowak,N. Oza,O. Palamara,N. Pallat,V. Paolone,A. Papadopoulou,V. Papavassiliou,H. B. Parkinson,S. F. Pate,N. Patel,Z. Pavlovic,E. Piasetzky,I. Pophale,X. Qian,J. L. Raaf,V. Radeka,A. Rafique,M. Reggiani-Guzzo,L. Ren,L. Rochester,J. Rodriguez Rondon,M. Rosenberg,M. Ross-Lonergan,C. Rudolf Von Rohr,I. Safa,G. Scanavini,D. W. Schmitz,A. Schukraft,W. Seligman,M. H. Shaevitz,R. Sharankova,J. Shi,E. L. Snider,M. Soderberg,S. Soldner-Rembold,J. Spitz,M. Stancari,J. St. John,T. Strauss,A. M. Szelc,W. Tang,N. Taniuchi,K. Terao,C. Thorpe,D. Torbunov,D. Totani,M. Toups,Y. -T. Tsai,J. Tyler,M. A. Uchida,T. Usher,B. Viren,M. Weber,H. Wei,A. J. White,S. Wolbers,T. Wongjirad,M. Wospakrik,K. Wresilo,W. Wu,E. Yandel,T. Yang,L. E. Yates,H. W. Yu,G. P. Zeller,J. Zennamo,C. Zhang
PHYSICAL REVIEW LETTERS（2024）
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摘要
We present the first search for heavy neutral leptons (HNLs) decaying into nu e(+)e(-) or nu pi(0) final states in a liquid-argon time projection chamber using data collected with the MicroBooNE detector. The data were recorded synchronously with the NuMI neutrino beam from Fermilab's main injector corresponding to a total exposure of 7.01 x 10(20) protons on target. We set upper limits at the 90% confidence level on the mixing parameter |U-mu 4| (2) in the mass ranges 10 <= mHNL <= 150 MeV for the nu e+e- channel and 150 <= m(HNL)<= 245 MeV for the nu pi(0) channel, assuming |U-e4| (2) = |U-tau 4|( 2 )= 0. These limits represent the most stringent constraints in the mass range 35 < m(HNL) < 175 MeV and the first constraints from a direct search for nu pi(0) decays.
