NorCal HEP-EXchange 2018

Session

Lightning Talks

1 Dec 2018, 09:55

Building 50 Auditorium (Lawrence Berkeley National Lab)

32. A new method for silicon sensor charge calibration using Compton scattering

William Mccormack

01/12/2018, 09:55

As silicon sensors become increasingly thin, the threshold for charge detection decreases, making a calibration of the sensor's charge sensitivity with traditional sources difficult. We present a new method for charge sensitivity calibration using the Compton scattering of photons emitted from an radioactive source or x-ray generator. The electron scattered from the photon ranges out near...

44. Study of Radiation Hard Dielectric Materials for the High Luminosity LHC

Derikka Bisi (UC Davis)

01/12/2018, 10:05

As the High Luminosity Large Hadron Collider (LHC) upgrade approaches, a suitable dielectric material will be needed to provide electrical isolation between the silicon detectors and readout electronic chips in the next generation of trackers. An ideal dielectric candidate for the upgrade should survive the high radiation environment of the LHC, provide high resistivity for isolation, and...

46. Development of Suitable Dielectrics for the High Luminosity LHC

Selene Cheung (UC Davis Physics)

01/12/2018, 10:15

The tracking detectors at the High Luminosity Large Hadron Collider will require a dielectric capable of withstanding the high voltage that will be applied across their silicon sensors to maintain efficiency. Dielectrics are currently being studied using experimental device configurations which are electrostatically analogous to the LHC trackers to determine the most effective material to...

45. The GAmmas from Nuclear Decays Hiding from Investigators (GANDHI) Experiment

Harikrishnan Ramani

01/12/2018, 11:45

We propose a high statistics experiment to search for invisible decay modes in nuclear gamma
cascades. A radioactive source (such as 60Co or 24Na) that triggers gamma cascades is placed
in the middle of a large, hermetically sealed scintillation detector, enabling photon identification
with high accuracy. Invisible modes are identified by establishing the absence of a photon in a...

42. PSD capabilities of a SiPM-based Readout Board

Mr Jyothisraj Johnson (UC Davis)

01/12/2018, 11:55

Much work has already been done developing a compact fast neutron camera for field deployment. However, mobility of the current designs are limited in part by the inclusion of large photomultiplier tubes (PMTs). Replacement of PMTs with silicon photomultipliers (SiPMs) coupled to a crystal scintillator promises a reduction in size and power, and thus an increase in mobility of current systems....

35. A Study of Grid Electron Emission in LZ using a Gaseous Xenon Test Vessel at SLAC

Mr Ryan Linehan (SLAC)

01/12/2018, 14:50

To observe signals from low-energy nuclear recoils, including WIMP-xenon scatters, the LZ dark matter detector must maintain strong drift and extraction fields within its dual-phase xenon Time Projection Chamber (TPC). We will accomplish this with a set of four stainless steel wire mesh high voltage grids placed at various heights in the TPC. Because the grid wires are regions where electric...

31. Probing new physics using non-pointing and delayed photons with the ATLAS detector

Sai Santpur

01/12/2018, 15:00

ATLAS detector's Liquid Argon electromagnetic calorimeter is capable of precisely measuring photon's timing and pointing. This allows us to uniquely probe physics beyond the standard model that involves neutral long-lived particles that decay into photons. In this presentation, I will describe how ATLAS measures photon pointing and timing, summarize the results from Run 1 analysis and shed a...

52. Search for light pseudoscalar with overlapping di-tau decays using machine learning at the CMS detector

Grace Haza (University of California Davis (US))

01/12/2018, 15:10

Recent LHC searches have probed decays of the H(125) involving new light pseudoscalar bosons (a). For example, a current CMS search probes H->aa->mu mu tau tau for m(a) < 21 GeV. Because of the large mass difference between the H and the light pseudoscalar, the two taus are boosted and collimated. To improve signal acceptance for future studies, we explore the use of machine learning...

30. Test

Benjamin Nachman

Test