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arxiv: 2110.00409 · v2 · pith:XOMUZZ7Inew · submitted 2021-10-01 · ✦ hep-ex

Search for Neutrino-Induced Neutral Current Delta Radiative Decay in MicroBooNE and a First Test of the MiniBooNE Low Energy Excess Under a Single-Photon Hypothesis

MicroBooNE collaboration: P. Abratenko , R. An , J. Anthony , L. Arellano , J. Asaadi , A. Ashkenazi , S. Balasubramanian , B. Baller
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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-Anadon 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 T. Mohayai A. Mogan J. Moon M. Mooney A.F. Moor C.D. Moore L. Mora Lepin J. Mousseau M. Murphy 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. 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. Soldner-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
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classification ✦ hep-ex
keywords deltadecayeventsradiativegamma0pgamma1pnominalsingle-photon
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We report results from a search for neutrino-induced neutral current (NC) resonant $\Delta$(1232) baryon production followed by $\Delta$ radiative decay, with a $\langle0.8\rangle$~GeV neutrino beam. Data corresponding to MicroBooNE's first three years of operations (6.80$\times$10$^{20}$ protons on target) are used to select single-photon events with one or zero protons and without charged leptons in the final state ($1\gamma1p$ and $1\gamma0p$, respectively). The background is constrained via an in-situ high-purity measurement of NC $\pi^0$ events, made possible via dedicated $2\gamma1p$ and $2\gamma0p$ selections. A total of 16 and 153 events are observed for the $1\gamma1p$ and $1\gamma0p$ selections, respectively, compared to a constrained background prediction of $20.5 \pm 3.65 \text{(sys.)} $ and $145.1 \pm 13.8 \text{(sys.)} $ events. The data lead to a bound on an anomalous enhancement of the normalization of NC $\Delta$ radiative decay of less than $2.3$ times the predicted nominal rate for this process at the 90% confidence level (CL). The measurement disfavors a candidate photon interpretation of the MiniBooNE low-energy excess as a factor of $3.18$ times the nominal NC $\Delta$ radiative decay rate at the 94.8% CL, 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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