Introduction

• Béla Majorovits

Room: Seminar room 313

Development of LAr TPCs for future neutrino experiments

• Andrea Falcone

Room: Seminar room 313 Liquid Argon Time Projection Chambers showed perfect characteristics to be used in neutrino physics. The final goal of this technology will be the realization of the multi kiloton detector for DUNE. The next working TPC based big experiment will be the SBN at Fermilab, a three detectors experiment that should give us a 5σ answer to the existence of sterile neutrino. The far detector, ICARUS T600, embarked a long journey from Italy to Fermilab, with a stop at CERN for a complete refurbishment, to make it suitable for not underground data taking. The most important operation of this refurbishment was the renewal of the light detection system. Also other small experiments are working to build better and better detectors to permit new physics discoveries. Among them LArIAT, that carried on a lot of R&D study, regarding both charge and light collection.

Neutrino oscillation measurements at T2K

• Xiaoyue Li

Room: Seminar room 313 T2K (Tokai to Kamioka) is a neutrino experiment designed to investigate the phe- nomenon of neutrino oscillations. An intense beam of muon neutrinos is generated at the J-PARC accelerator complex on the East coast of Japan and directed 295km across the country to the Super-Kamiokande (Super-K) neutrino detector in the mountains of western Japan. The beam is measured before it leaves the J-PARC site by a suite of near detectors and again at Super-K: the change in the measured intensity and avor composition of the beam is used to provide information on the properties of neutrinos. T2K was the rst experiment to observe electron neutrino appearance from a muon neu- trino beam and has produced world leading measurements of sin2 23 and jm2 23j as well as making a host of cross-section measurements. In 2016, T2K reported an indication of CP violation at 90% C.L. Since then, the J-PARC main ring beam power has increased to 470kW and T2K has doubled its exposure in neutrino beam mode. In addition, an approximately 30% increase in statistics has been achieved for all existing run periods through improvements to the event selection at Super-K. With this enhanced dataset T2K has performed a new analysis in 2017. The preliminary results reject the hypothesis that neutrinos and antineutrinos oscillate with the same probability at 95% C.L. (2). This talk will describe in detail the latest T2K analysis, as well as the on-going eort to incorporate Super-K sub-GeV atmospheric neutrino data into the current T2K analysis framework to further enhance the sensitivity to oscillation parameters.

Background and noise mitigations for rare event search

• C. Lee

Room: Seminar room 313 Rare event searches such as neutrino-less double beta decay or direct detection of WIMP require stringent control of background and noise that might overwhelm or distort the signals. Examples of such controls for the LUX and AMoRE experiments are presented. For LUX, I will discuss about removal of radioactive krypton from xenon and statistical modeling of radon progeny. For AMoRE, I will present isolation of vibration and a custom DAQ.

NStar: Searching for Mirror Neutron - Neutron Oscillations

• P. Mohan Murty

Room: Seminar room 313 The corner stone of standard model of particle physics is Lorentz symmetry (a special result of which is Einstein's special theory of relativity). It was shown by G. L\"uders and Pauli that Lorentz symmetry translates to the joint conservation of the three discrete symmetries of Charge inversion, Parity inversion and Time inversion [1, 2]. This equivalence is known as the CPT theorem. Neutral kaon decay mediated by the weak nuclear force (to 2π0​​ or to 3π0​​) showed that CP symmetry is violated [3]. This violation is allowed if T-symmetry is also violated. But to date no CP or T-symmetry violation has been observed in any strong force mediated process. This is known as the Strong-CP problem [4]. It was pointed by Ref. [5] that introduction of a mirror realm (which does not interact with our real realm) could solve the Strong-CP problem and that neutral particles such as neutrons may spontaneously oscillate to their mirror universe counterpart (n ↔ n'​​) [6]. Consequently, two separate groups performed their experiments in search of such neutron - mirror neutron oscillations and reported having found no evidence of such oscillations [7, 8]. This, in turn, set limits on the oscillation time, τnn' >​​ 414 s. Soon after, Ref. [9] pointed out inconsistencies in the results obtained by these two experiments. Furthermore, Ref. [9] showed that when the results of these two experiments are combined, the inconsistencies can be explained by introducing a mirror neutron oscillation in presence of a magnetic field in the mirror realm. Indeed, the two prior experiments had assumed the absence of any magnetic fields in the mirror realm and only considered applied real magnetic fields. Therefore we need a new experiment to verify or exclude these spurious results. We will look at the preliminary results of our newest effort to search for mirror neuron oscillations.

X-CSIT: a toolkit for simulating 2D pixel detectors

• A. Joy

Room: Seminar room 313 X-CSIT, the X-ray Camera SImulation Toolkit, is a software package designed to simulate the physics and electronics of 2D semiconductor pixel detectors. The principle concept of X-CSIT is the separation of the program into three separate and modular sub-simulations of the particle interaction, charge cloud propagation and electronic response. Designed to simulate the many detectors to be used at the European X-ray Free Electron Laser (EuXFEL), X-CSIT is designed modular and adaptable to multiple detectors. Results of comparison to data taken with real detectors will also be presented