Neutrino Interaction Study and Milestones Report in Particle Physics Experiment

WP3 status report (September 2016) Vincenzo Berardi INFN Sezione di Bari (ITALY) EU Grant n.644294

Outline T2K - The experiment T2K - The collaboration T2K The JENNIFER participation WP3 Summary and milestones WP3 Report WP3 - Secondment status Conclusions 2 London 22-23/9/16 EU Grant n.644294

T2K The experiment Intense high purity muon (anti)neutrino beam from J-PARC to Super-K to study: Muon (anti) neutrino disappearance Electron (anti) neutrino appearance e( e) Rich program of: neutrino cross sections studies with near detectors exotic physics: sterile neutrinos, etc 3 London 22-23/9/16 EU Grant n.644294

The Collaboration 4 London 22-23/9/16 EU Grant n.644294

The JENNIFER participation in WP3 5 London 22-23/9/16 EU Grant n.644294

WP3 - Summary 1/2 Asses the contribution of neutrino interaction in the sand and rock surrounding the near detector; Study of neutrino-nuclei and Meson Exchange Current interactions; Study of anti-neutrino interactions; Share the analysis techniques among the project participants and provide opportunities for the ESR to increase the interaction with KEK scientists. 6 London 22-23/9/16 EU Grant n.644294

WP3 - Summary 2/2 Task 3.1 - Neutrino interactions and cross sections: [CEA, IFAE, INFN, NCBJ, QMUL, RAL] Task 3.2 External background studies: [NCBJ,QMUL,RAL] Task 3.3 Exotic Physics: [IFAE,QMUL,RAL] 7 London 22-23/9/16 EU Grant n.644294

WP3 Milestones report on anti neutrino analysis; EMD:24 (April 2017) report on the methods of MEC searches; EMD: 48 (april 2019) combined muon and electron neutrino oscillation analysis report; EMD: 48 (april 2019) 8 London 22-23/9/16 EU Grant n.644294

WP3 - Secondment status Total months 1-17 WP Days total months planned fraction Started secondmts fraction started planned in 4 years WP1 WP2 WP3 WP4 WP5 Total 259 2078 943 381 41 3702 8,6 69,3 31,4 12,7 1,4 123,4 19 107 51 53 45,4% 64,7% 61,6% 24,0% 27,3% 52,5% 17 94 45 32 2 190 89,5% 87,9% 88,2% 60,4% 40,0% 80,9% 65 227 113 98 10 513 5 235 Fraction of started 88% secondments is higher than the the fraction of completed units 61%. Data Taking periods shorter than expected Considerable increase expected in the next 18 months due to increased time for Data Taking. 9 London 22-23/9/16 EU Grant n.644294

WP3 T2K- Timeline June 2014 - T2K sees its first event in antineutrino beam mode; March 2015 - J-PARC delivers 1 1021protons on target (POT) to T2K; May 2015 - T2K releases its first measurement of muon-antineutrino disappearance; October 2015 Takaaki Kajita is awarded the Nobel prize in Physics November 2015 All members of T2K Collaboration are awarded the Breakthrough Prize in Physics April 2016 T2K run extension to study CP violation June 2016 T2K presents first CP violation search result August 2016 - T2K presents new CP violation search result including neutrino and antineutrino modes 10 London 22-23/9/16 EU Grant n.644294

WP3 Papers and careers T2K activities related to WP3 have produced 12 publications in the last 18 months and 100 Citations (source WoS) Overall production in 5 years is 30 publications and more than 1600 citations. Andra Longhin (INFN) ERC consolidator ENUBET Gianfranca de Rosa (INFN) ERC consolidator Interview stage Lorenzo Magaletti (INFN) 2015 Bruno Rossi prize for best PhD Thesis in astro-particle physics Stefania Bordoni (IFAE) CERN Fellow frm 2016 to work on Neutrino Platform 11 London 22-23/9/16 EU Grant n.644294

Conclusions 1/3 All the task are proceeding as expected towards the first deliverable, due on month 24. Task 3.1 - neutrino interactions and cross section (all participants involved) 1. measured the CC1pi cross section in water and we are investigating the nue-CC0pi and CC1pi coherent in water; 2. measured the CC0pi cross-section using the near detector data; 3. the 2 particle-2 hole (2p-2h) investigation is on-going: a first indication of the existence of 2p-2h interactions has been assessed and the result is about published on PRD. (Meson Exchange Studies) MEC are currently carried on by using kinematical variables of reconstructed tracks as well as the search for not reconstructed protons using vertex activity and neural network; 4. Ongoing detailed comparison of the measurements with most advanced 2p2h models and a study of 2p2h effect on oscillation analysis for estimation of systematics is currently carried on; 5. Ongoing analysis of cross-section measurements for nu/nubar and carbon/oxygen 12 London 22-23/9/16 EU Grant n.644294

Conclusions 2/3 Task 3.2 - External background studies (NCBJ, QMUL, RAL) 1. We have studied the impact of different effects (sand density, flux tuning) on the rate of incoming particles from beam neutrinos interactions outside of ND280 in order to reduce the observed discrepancy between data and MonteCarlo; 2. we are investigating the possibility to use sand muons to probe high energy part of neutrino spectrum; Task 3.3 - Exotic physics (IFAE, QMUL, RAL) 1. Sterile neutrino analysis is currently on-going; 2. we have successfully performed a very accurate measurement of Lorentz violation and a paper is being published. 13 London 22-23/9/16 EU Grant n.644294

Final comment All tasks proceed as scheduled, deadlines will deliverables will be honored. be met and 14 London 22-23/9/16 EU Grant n.644294