Search for Neutrino-Induced Neutral-Current
Δ
Radiative Decay in MicroBooNE and a First Test of the MiniBooNE Low Energy Excess under a Single-Photon Hypothesis
P. Abratenko,R. An,J. Anthony,L. Arellano,J. Asaadi,A. Ashkenazi,S. Balasubramanian,B. Baller,C. Barnes,G. Barr,V. Basque,L. Bathe-Peters,O. Benevides Rodrigues,S. Berkman,A. Bhanderi,A. Bhat,M. Bishai,A. Blake,T. Bolton,J. Y. Book,L. Camilleri,D. Caratelli,I. Caro Terrazas,R. Castillo Fernandez,F. Cavanna,G. Cerati,Y. Chen,D. Cianci,J. M. Conrad,M. Convery,L. Cooper-Troendle,J. I. Crespo-Anadón,M. Del Tutto,S. R. Dennis,P. Detje,A. Devitt,R. Diurba,R. Dorrill,K. Duffy,S. Dytman,B. Eberly,A. Ereditato,J. J. Evans,R. Fine,G. A. Fiorentini Aguirre,R. S. Fitzpatrick,B. T. Fleming,N. Foppiani,D. Franco,A. P. Furmanski,D. Garcia-Gamez,S. Gardiner,G. Ge,S. Gollapinni,O. Goodwin,E. Gramellini,P. Green,H. Greenlee,W. Gu,R. Guenette,P. Guzowski,L. Hagaman,O. Hen,C. Hilgenberg,G. A. Horton-Smith,A. Hourlier,R. Itay,C. James,X. Ji,L. Jiang,J. H. Jo,R. A. Johnson,Y.-J. Jwa,D. Kalra,N. Kamp,N. Kaneshige,G. Karagiorgi,W. Ketchum,M. Kirby,T. Kobilarcik,I. Kreslo,R. LaZur,I. Lepetic,K. Li,Y. Li,K. Lin,B. R. Littlejohn,W. C. Louis,X. Luo,K. Manivannan,C. Mariani,D. Marsden,J. Marshall,D. A. Martinez Caicedo,K. Mason,A. Mastbaum,N. McConkey,V. Meddage,T. Mettler,K. Miller,J. Mills,K. Mistry,A. Mogan,T. Mohayai,J. Moon,M. Mooney,A. F. Moor,C. D. Moore,L. Mora Lepin,J. Mousseau,M. Murphy,R. Murrells,D. Naples,A. Navrer-Agasson,M. Nebot-Guinot,R. K. Neely,D. A. Newmark,J. Nowak,M. Nunes,O. Palamara,V. Paolone,A. Papadopoulou,V. Papavassiliou,S. F. Pate,N. Patel,A. Paudel,Z. Pavlovic,E. Piasetzky,I. D. Ponce-Pinto,S. Prince,X. Qian,J. L. Raaf,V. Radeka,A. Rafique,M. Reggiani-Guzzo,L. Ren,L. C. J. Rice,L. Rochester,J. Rodriguez Rondon,M. Rosenberg,M. Ross-Lonergan,G. Scanavini,D. W. Schmitz,A. Schukraft,W. Seligman,M. H. Shaevitz,R. Sharankova,J. Shi,J. Sinclair,A. Smith,E. L. Snider,M. Soderberg,S. Söldner-Rembold,P. Spentzouris,J. Spitz,M. Stancari,J. St. John,T. Strauss,K. Sutton,S. Sword-Fehlberg,A. M. Szelc,W. Tang,K. Terao,C. Thorpe,D. Totani,M. Toups,Y.-T. Tsai,M. A. Uchida,T. Usher,W. Van De Pontseele,B. Viren,M. Weber,H. Wei,Z. Williams,S. Wolbers,T. Wongjirad,M. Wospakrik,K. Wresilo,N. Wright,W. Wu,E. Yandel,T. Yang,G. Yarbrough,L. E. Yates,H. W. Yu,G. P. Zeller,J. Zennamo,C. Zhang
Physical Review Letters（2022）
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摘要
We report results from a search for neutrino-induced neutral current (NC) resonant Δ(1232) baryon production followed by Δ radiative decay, with a ⟨0.8⟩ GeV neutrino beam. Data corresponding to MicroBooNE's first three years of operations (6.80×10^{20} protons on target) are used to select single-photon events with one or zero protons and without charged leptons in the final state (1γ1p and 1γ0p, respectively). The background is constrained via an in situ high-purity measurement of NC π^{0} events, made possible via dedicated 2γ1p and 2γ0p selections. A total of 16 and 153 events are observed for the 1γ1p and 1γ0p selections, respectively, compared to a constrained background prediction of 20.5±3.65(syst) and 145.1±13.8(syst) events. The data lead to a bound on an anomalous enhancement of the normalization of NC Δ radiative decay of less than 2.3 times the predicted nominal rate for this process at the 90% confidence level (C.L.). The measurement disfavors a candidate photon interpretation of the MiniBooNE low-energy excess as a factor of 3.18 times the nominal NC Δ radiative decay rate at the 94.8% C.L., in favor of the nominal prediction, and represents a greater than 50-fold improvement over the world's best limit on single-photon production in NC interactions in the sub-GeV neutrino energy range.
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关键词
radiative decay,miniboone low energy excess,neutrino-induced,neutral-current,single-photon
