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Miniboone Oscillation Results with Complete Dataset MiniBooNE Oscillation Results with Complete Dataset Adrien Hourlier on behalf of the MiniBooNE Collaboration 2020/07/02 preprint available at arxiv:2006.16883 Comparing MiniBooNE and LSND LSND (1993-1998) MiniBooNE (2002-2019) 0.8 GeV proton beam Decay At Rest neutrino flux 8 GeV proton beam Decay In Flight beam LANSCE proton beam water target beamstop L ~ 30 m Advances in High Energy Physics ! E ~ 30 MeV Interaction Track Cherenkov Candidate + + � → � �� Muon + $ CCQE − � �¯��� $ +n→ p+$ Electron e CCQE − e +n→ p+e Scintillation Neutral pion NC!∘ Time ∘ Cerenkov Neutron +N→ +N+! capture on H F"#$%& ': (Color online) MiniBooNE particle reconstruction [(]. From top to bottom, a muon neutrino charged-current quasielastic (CCQE) Different systematics. Same L/E baseline.interaction, an electron neutrino CCQE interaction, and a neutral current, neutral pion production (NC) ) interaction. *esecondandthe third columns show the characteristics of tracks and Cherenkov rings [+], and the last column shows the event∘ displays of candidate events. Adrien Hourlier — The XXIX International Conference on Neutrino Physics and Astrophysics — July 2nd 2020 ! 2 For the ] ] (] ] ) oscillation study, the follow- running, there was little neutrino cross section data in the ing three particle reconstruction algorithms were the most )00 MeV to few GeV energy regime. In response, MiniBooNE important: single" → Cherenkov# " → rings# from amuonand developed a highly successful campaign of cross section an electron and the two-ring electromagnetic shower topol- measurements, some of which are described here. *ese ogy from aneutralpiondecaytotwogammas.(1) Figure(2)' results are interesting by themselves and also can be used as shows the di,erent characteristics of these three signals, direct inputs to the BSM analyses, as described later in this including(3) examples of typical events in the detector [(]. paper. *ereconstructionalgorithmscanalsoreconstructmore MiniBooNE’s beam is among the .rst high-statistics, high complicated topologies important for constraining back- purity 1uxes in the energy range from )00 to )200 MeV. grounds and for cross section studies discussed below. *e *e observation of the resulting events in a large, isotropic charged-current single charged pion (CC) ) interaction detector with coverage is unique. Within this detector it is reconstruction algorithm [-] .ttwoCherenkovringsfrom+ relatively easy to achieve uniform angular acceptance. Also, .nal state particles, a charged lepton, and a! positive pion, the active veto4! makes it possible to measure NC interactions to .nd their kinematics. *e charged-current single neutral e,ectively. Insensitivity of hadronic details worked in pos- pion (CC) ) interaction reconstruction algorithm [/] .t itively. *ehadronmultiplicityo3en causes confusions for a charged lepton∘ and a neutral pion (which consists of tracker detectors. Although the MiniBooNE detector cannot two electromagnetic! showers, that is, the algorithm .ts for measure multiple hadron tracks, it measures total energy three Cherenkov rings). Another algorithm identi.es and of low energy hadrons (such as protons below Cherenkov reconstructs the neutral current elastic (NCE) interaction threshold from CCQE interactions) in calorimetric way, and, [)0], where the total kinetic energy of .nal state nucleons is as a result, the details of .nal state interactions (FSIs), such found using scintillation light. as rescattering, absorption, and charge exchange, do not Along with reconstruction of the light topology in the strongly a,ect reconstruction of kinematics. detector, event identi.cation also relies upon “subevents.” Perhaps most importantly to the overall impact of the *ese are bursts of light separated in time which indicate data, the MiniBooNE collaboration provided the cross sec- asequenceofdecay.Forexample,amuonwhichstopsand tion data in a form that is most useful to theorists. Tradi- then emits a decay (“Michel”) electron will produce two tionally, cross section data have been presented either as a subevents, one from the initial muon and the one from the function of neutrino energy ( ])or(-momentum transfer Michel electron. ( ). *is presentation is problematic in the MiniBooNE energy2 region, because of the importance# of nuclear e,ects: 3. MiniBooNE Cross Section Results Fermi$ motion smears the kinematics, binding energy shi3s the energy spectrum, nucleon correlations a,ect both energy All searches for BSM physics rely on a precise understand- dependence and normalization of cross sections, and pions ing of SM interactions. However, when MiniBooNE began may be created, absorbed, and charge-exchanged within The MiniBooNE Detector • ⌀12.2 m sphere, ⌀10m fiducial volume • 800 tons of mineral oil, 450 tons fiducial mass • 2 optically isolated volumes • 1280 inner PMTs, 240 veto PMTs • Very well understood detector • 3% change of the energy scale over 17 years of running • Measurements of cross sections for >90% of the neutrino and anti-neutrino processes (Neutrino mode) Adrien Hourlier — The XXIX International Conference on Neutrino Physics and Astrophysics — July 2nd 2020 3 Data taking timeline 2nd data set ν: 6.38x1020 POT 1st data set ν: 6.46x1020 POT 1st data set ν¯: 11.27x1020 POT Beam dump dark matter search 3rd data set ν: 5.91x1020 POT • We have added another ~6x1020 POT to the neutrino dataset since the previous data release. • The detector was turned off at the end of summer 2019, mothballed and waiting for future use… • Almost 17 years of running, or as much as 5 army ants worth of protons! Adrien Hourlier — The XXIX International Conference on Neutrino Physics and Astrophysics — July 2nd 2020 4 Data taking timeline 2nd data set ν: 6.38x1020 POT 1st data set ν: 6.46x1020 POT 1st data set ν¯: 11.27x1020 POT Beam dump dark matter search graduated from high school! 3rd data set ν: 5.91x1020 POT • We have added another ~6x1020 POT to the neutrino dataset since the previous data release. • The detector was turned off at the end of summer 2019, mothballed and waiting for future use… • Almost 17 years of running, or as much as 5 army ants worth of protons! Adrien Hourlier — The XXIX International Conference on Neutrino Physics and Astrophysics — July 2nd 2020 4 Data taking timeline 2nd data set ν: 6.38x1020 POT 1st data set ν: 6.46x1020 POT 1st data set ν¯: 11.27x1020 POT Beam dump dark matter search graduated from high school! 3rd data set ν: 5.91x1020 POT • We have added another ~6x1020 POT to the neutrino dataset since the previous data release. • The detector was turned off at the end of summer 2019, mothballed and waiting for future use… • Almost 17 years of running, or as much as 5 army ants worth of protons! Adrien Hourlier — The XXIX International Conference on Neutrino Physics and Astrophysics — July 2nd 2020 4 Dark matter run + + J/ψ→ 7 K →π +invis. 10− invis. favored • First dedicated search for direct detection of αµ accelerator-produced dark matter in a proton 10−8 = 0.5) BaBar beamline D α , MB Elastic N • Beam aimed off of the target χ MB Electron + Timing D 98, 112004 Phys. Rev. • ν flux reduced by ~50 MB Full N Direct = 3m −9 + Timing V 10 Detection • Demonstrated the power of neutrino detectors Nucleon (m XENON10/100- 4 -e ) χ in searching for accelerator-produced dark V /m matter χ −10 E137 (m 10 D α 2 ε NA64 Y = 10−11 Relic Density LSND 10−3 10−2 10−1 2 mχ (GeV/c ) Adrien Hourlier — The XXIX International Conference on Neutrino Physics and Astrophysics — July 2nd 2020 5 Excellent long term detector stability over 3 run periods Michel electron spectrum π0 mass 1.2 1.2 4000 4000 st 20072007st data data 20 20 data 2007 2007 data 1 1νe 6.46νe 6.46×10×10 POT POT 1.0 1.0 nd 2017nd data 20 20 2 22017νe 6.38 νdatae 6.38×10×10 POT POT 800 data 2017 2017 data 800 3rd 3νrd 5.91ν 5.91×1020×10 POT20 POT 0.8 0.8 20192019e data edata data 2019 2019 data 30003000 0.6 0.6 events/MeV events/MeV events/2 MeV 0.4 0.4 600 600 events/2 MeV 2000 Excess Events/MeV 0.2 Excess Events/MeV 0.2 2000 0.0 0.0 400 400 1000 −0.2−0.2 0.2 0.20.4 0.40.6 0.610000.8 0.81.0 1.01.2 1.21.4 1.41.6 1.6 MiniBooNEQE QE preliminary MiniBooNE preliminary 0 E E (GeV) (GeV) 20 ν 18.75ν 40 x 1020 POT 60 200 18.75 x 1020 POT 200 E [MeV] FIG. 7:FIG. The 7: plot The shows plot showsthe total the event total excesses event excesses in neutrino in neutrino mode for mode the for first, the second, first, second, and third and third 0 runningrunning periods. periods. Error bars Error include bars include only statistical only statistical uncertainties. uncertainties.20 40 60 100180 120160 140140 160120 180100 1.4 Ratio 2019/2007 2 0 0 2 12 12 E [MeV] ] [MeV/c mass invariantinvariant mass [MeV/c ] GordonGordon coefficients, coefficients, and the and probability the probability of1.2 pion of escape pion2019/2017 escape from the fromCnucleusisestimated the Cnucleusisestimated π π 12 12 to beto 62.5%. be 62.5%. The ∆ Theradiative∆ radiative branching branching fraction fraction is 0.60% is 0.60% for C for andC 0.68% and 0.68% for H2 forafter H2 after 1 integratonintegraton over all over the all invariant the invariant mass range, massWe range, where can where the single theuse single gamma gammatwo production production standard branching branching candles to calibrate the energy scale over the different data sets • 1.40.8 Ratio 1.4 1.4 Ratio ratio increasesratio increases below below the pion the production pion production threshold. threshold.2019/2007 With these With values, these values, the ratio the of ratio single of single 2019/2007 2019/2007 Ratio 0 0 Scale0.6 up the energy response to match the original 2007 data release: gammagamma events events to NC to⇡ NCevents,⇡ events,R,• canR be, can1.2 estimated be estimated to2019/2017 be to be 1.2 2019/2017 2019/2017 1.2 20 40 60 E [MeV] R =0.R151=0.1510.00680.00681.5+0•1..5225+01 2015-2017.5220.00600.00601.5/0.6251.5/ =0.625 0.
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