1. GOOD RUN SELECTION FOR NO ν A ANALYSIS Barnali Chowdhury 1, Louise Suter 2, Joao Coelho 3, Jim Musser 4 1 University of South Carolina, 2 Argonne National Lab., 3 Tufts University, 4 Indiana University for the NOνA Collaboration Neutrinos are electrically neutral, weakly interacting elementary particle with half integer spin. Neutrinos are electrically neutral, weakly interacting elementary particle with half integer spin. here are three different types of neutrinos: muon neutrinos, electron There are three different types of neutrinos: muon neutrinos, electron neutrinos and tau neutrinos that neutrinos and tau neutrinos that exist with their anti particles. exist with their anti particles. Neutrinos are the least well Neutrinos are the least well known of all the standard known of all the standard model particles. model particles. The detectors Two functionally identical detectors Situated 14 milliradians off the NuMI neutrino beam axis and 809 km apart 2 GeV neutrino beam produced at Fermilab Near Detector Location 105 m underground 105 m underground 1 km from production target 1 km from production target NOνA will address the following physics [4] Measure 4 oscillation channels : Measure θ 13, θ 23, mass hierarchy, and δ CP Measure Sterile Neutrino ? And more… How are NOνA neutrinos produced? 120 GeV protons fired at carbon target Make π’s and κ’s These are focused by magnetic horn and decay into ν μ ceCube Website, Outreach pageB. Kayser, Neutrino Oscillation Physics, arXiv:1206.4 [hep-ph]. [1] IceCube Website, Outreach page [2] B. Kayser, Neutrino Oscillation Physics, arXiv:1206.4 [hep-ph]. The Review of Particle Physics: NK.A. Olive et al. (Particle Data Group), Chin. Phys. C, 38, 090001 (2014). [3] The Review of Particle Physics: NK.A. Olive et al. (Particle Data Group), Chin. Phys. C, 38, 090001 (2014). D. S. Ayreset al [NOvACollaboratEUTRINO MASS, MIXING, AND OSCILLATIONS [4] D. S. Ayreset al [NOvACollaboratEUTRINO MASS, MIXING, AND OSCILLATIONS ion], NOvA: Proposal to build a 30 kiloton off-axis detector to study nu(mu) -> nu(e) oscillations in the NuMI beamline ion], NOvA: Proposal to build a 30 kiloton off-axis detector to study nu(mu) -> nu(e) oscillations in the NuMI beamline hep-ex/0503053 (2004) hep-ex/0503053 (2004) X. Bu and K. Sachdev, NOvA docDB 12437, (2014) [5] X. Bu and K. Sachdev, NOvA docDB 12437, (2014) Near Detector was completed in August, 2014 Recorded a total of 5201 subruns since started taking data 4636 subruns ( 89.13% of total subruns ) are determined as good subruns The collected ND good data is analyzed for the measurement of neutrino signal and background event counts Analysis underway to measure electron neutrino appearance Stay tuned for the NOνA first analysis result this summer A majority of the neutrinos floating around, were born around 15 billion years ago, soon after the birth of the universe. A majority of the neutrinos floating around, were born around 15 billion years ago, soon after the birth of the universe. Other neutrinos are constantly being produced from nuclear power stations, particle accelerators, nuclear bombs, general atmospheric phenomena, and during the births, collisions, and deaths of stars, particularly the explosions of supernovae. Other neutrinos are constantly being produced from nuclear power stations, particle accelerators, nuclear bombs, general atmospheric phenomena, and during the births, collisions, and deaths of stars, particularly the explosions of supernovae. Though a trillion naturally occurring neutrinos from the sun and other bodies in the galaxy pass through us each second, they interact so rarely with other particles that they are very difficult to detect [1]. Though a trillion naturally occurring neutrinos from the sun and other bodies in the galaxy pass through us each second, they interact so rarely with other particles that they are very difficult to detect [1]. The neutrinos we are studying here are from the Fermi Lab NuMI beam. The neutrinos we are studying here are from the Fermi Lab NuMI beam. Your caption can go here. Near Detector (ND) Good Runs The data is taken in terms of runs and subruns. While collecting the data we simultaneously calculate detector quality parameters. With those quantities, 6 significant metrics are applied to remove bad data. If the detector response remains good over the course of a run/subrun, we classify them good run/subrun. Example of the metrics used to Determine ND Good Runs : Good Run Selection Efficiency of the Near Detector Spill Level Data Quality REFERENCES The NOvA Experiment Neutrinos are created and observed in flavor eigenstates ν e, ν μ, and ν τ but travel through space in mass eigenstates ν 1, ν 2 and ν 3. 1. 1.How many neutrino species? Are there sterile neutrinos? 2. 2.Scale of neutrino mass and ordering of neutrino mass (mass hierarchy) Currently, we know Mν ~ <1eV The electron(m e =.511MeV) is ~500,000 times bigger than the neutrinos, why? What is the order of the mass eigenstates? Is the hierarchy normal or inverted ? [2] 1. 1.What is the neutrino mass/mixing matrix? Why is it so different from quarks? 4. CP violation in neutrino sector? Leptogenesis? CP violation in neutrinos would mean that the probability of oscillation for neutrinos is different than anti-neutrinos Leptogenesis – Leptogenesis – CP violation in leptons could be a reason why we see matter/antimatter asymmetry in the universe CPT violation would mean the mass hierarchy of neutrinos would be different from anti-neutrinos [3] 5. Dirac neutrinos? Majorana neutrinos? NO ν A Near Detector Data Quality (subrun based) To establish the number of clusters expected, given the Protons on Target. To verify that the full detector is running at nominal gain To identify runs with very low intensity. The percentage of selected and rejected data (by different selection cuts) as a function of time over a period of one month. Overall efficiency of the ND was at 93.5% for the last month. Total live time to ensure that there’s enough data to extract reasonable mip rate. Where are they coming from ? Selection Cut AppliedRejected Fraction of Subruns (in %) Good Di-Block Cut2.86 % Median MIP Hitrate (Proton on target scaled) Cut 4.53 % Sub run Duration Cut5.24 % Empty Spill Fraction Cut5.05 % Timing Peak Cut3.30 % Slice Cut3.48 % An Event Display in the Near Detector over 10 μs time window Unanswered Questions in Neutrino Physics The table shows percentage of data rejected by different data quality metrics. The metrics are applied independently and the rejected fraction of subruns are calculated over the entire runs collected so far. What is a Neutrino ? Result and Conclusion To maximize physics output from the data, spill level data quality cuts are applied. These cuts filter out low quality spills that are missed by subrun level data quality cuts. Spill level data quality flags deal with a) Number of missing Data Concentrator Modules (DCMs) b) Number of out of beam window (in the beam window covers 218μs < T < 228μs) hits c) Number of noisy APDs d) Lights- on effect [5]. The event display shows spill level data quality is able to identify bad spills with missing DCM4 for DB3.