Cosmic Muons Induced EM Shower in NOνA

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1 Cosmic Muons Induced EM Shower in NOνA Nitin Yadav Bipul Bhuyan, Hongyue Duyang, Sanjib Mishra, Peter Shanahan DAE Symposium IIT Guwahati 10 Dec, Dec, / 17

2 Outline NOνa detector Motivation Shower Extraction Shower PID Reweight Conclusion 10 Dec, / 17

3 NOνA baseline Baseline Long baseline neutrino oscillation experiment. 810 km long baseline from Fermilab to Minnesota. NuMI (Neutrino at the Main Injector) beam of ν µ goes directly from Fermilab to Minnesota. NOνA is 14 mrad Off-axis from beam. itin Yadav Bipul Bhuyan, Hongyue Duyang, Sanjib Mishra, DAEPeter BRNShanahan IITG 2014 (IITG/Fermilab) 10 Dec, / 17

NOνA detectors It has two similar functionality detector. Near detector to characterize the beam. Far detector for oscillation study. Far detector is 14 mrad off axis from the beam.

4 NOνA detectors It has two similar functionality detector. Near detector to characterize the beam. Far detector for oscillation study. Far detector is 14 mrad off axis from the beam. FD overburden is Barite + concrete, equivalent of 14 radiation lengths The Near Detector (ND) is 330 ft below surface, 0.3 kt. Far Detector (FD) is on surface, 14 kt. Baseline itin Yadav Bipul Bhuyan, Hongyue Duyang, Sanjib Mishra, DAEPeter BRNShanahan IITG 2014 (IITG/Fermilab) 10 Dec, / 17

Detector Components Composed of PVC modules extruded to form long tube-like cells, 15 m in FD, 4.2 m in ND Each cell is filled with liquid scintillator.

5 Detector Components Composed of PVC modules extruded to form long tube-like cells, 15 m in FD, 4.2 m in ND Each cell is filled with liquid scintillator. Optical fiber loop carries scintillation light to a pixel on anavalanche Photo Diode (APD) Each module contains 32 cells read out by 32 pixels of an APD Detector components itin Yadav Bipul Bhuyan, Hongyue Duyang, Sanjib Mishra, DAEPeter BRNShanahan IITG 2014 (IITG/Fermilab) 10 Dec, / 17

6 Motivation NOνA finds signal ν e events by detecting electrons in the final state ν e CC Major background ν µ NC where π 0 from hadronic showers decay into energetic photons It requires correct modelling and reconstruction of electrons Event Topology 1m 1m Proton ν μ Charged Current Proton Proton π 0 ( γγ) Electron ν e Charged Current Neutral Current Muon ν μ + n μ + p Michel e - ν e + n e + p ν + X ν + X' itin Yadav Bipul Bhuyan, Hongyue Duyang, Sanjib Mishra, DAEPeter BRNShanahan IITG 2014 (IITG/Fermilab) 10 Dec, / 17

7 Cosmic trigger Data stream for cosmic rate is 40 Hz. Data window is 500 µs in duration. (a) In Far Detector: 72kHz. (b) In Near Detector: 22 Hz. Top view Side view 10 Dec, / 17

8 Cosmic trigger Top view Side view 10 Dec, / 17

9 Shower finding DiF 0.1 Hz rate in FD Bremsstrahlung rate 51 Hz in FD 10 Dec, / 17

10 Muon removal technique Muon digits Muon digits removed 10 Dec, / 17

11 Shower variables 10 Dec, / 17

12 ANN inputs electron - photon electron - pion electron - muon itin Yadav Bipul Bhuyan, Hongyue Duyang, Sanjib Mishra, DAEPeter BRNShanahan IITG 2014 (IITG/Fermilab) 10 Dec, / 17

13 PID transverse likelihoods electron - muon electron - photon electron - pion itin Yadav Bipul Bhuyan, Hongyue Duyang, Sanjib Mishra, DAEPeter BRNShanahan IITG 2014 (IITG/Fermilab) 10 Dec, / 17

14 PID outputs LID LEM LEM does not recognise shower as events because of different angular and energy distribution of shower than beam events. 10 Dec, / 17

15 ν e reweighting 10 Dec, / 17

16 After reweight Before reweight After reweight 10 Dec, / 17

17 Conclusion Data and MC comparison seems in good agreement. PIDs are good in shape. A ν e re-weight method is developed to make cosmic EM showers resemble beam events. 10 Dec, / 17

Cosmic Muon induced EM Showers in NOνA Detector

Cosmic Muon induced EM Showers in NOνA Detector a, Hongyue Duyang b, Peter Shanahan c, Sanjib Mishra b and Bipul Bhuyan a a Indian Institute of Technology Guwahati, India b University of South Carolina,