[clas_members] Fwd: March 16th interview seminar

Stepan Stepanyan stepanya at jlab.org
Tue Mar 15 21:57:47 EDT 2022

Dear all,

This is a reminder that tomorrow instead of the round table meeting we will have interview/seminar for a candidate for the Hall-B postdoc position, see below.

Regards, Stepan

Begin forwarded message:

From: Eugene Pasyuk <pasyuk at jlab.org<mailto:pasyuk at jlab.org>>
Subject: March 16th interview seminar
Date: March 13, 2022 at 4:13:04 PM EDT
To: Andy Sandorfi <sandorfi at jlab.org<mailto:sandorfi at jlab.org>>, Daniel Carman <carman at jlab.org<mailto:carman at jlab.org>>, Eugene Pasyuk <pasyuk at jlab.org<mailto:pasyuk at jlab.org>>, Gagik Gavalian <gavalian at jlab.org<mailto:gavalian at jlab.org>>, Harut Avagyan <avakian at jlab.org<mailto:avakian at jlab.org>>, Latifa Elouadrhiri <latifa at jlab.org<mailto:latifa at jlab.org>>, Mac Mestayer <mestayer at jlab.org<mailto:mestayer at jlab.org>>, Marco Battaglieri <battagli at jlab.org<mailto:battagli at jlab.org>>, Maurizio Ungaro <ungaro at jlab.org<mailto:ungaro at jlab.org>>, Nathan Baltzell <baltzell at jlab.org<mailto:baltzell at jlab.org>>, Sergey Boyarinov <boiarino at jlab.org<mailto:boiarino at jlab.org>>, Stepan Stepanyan <stepanya at jlab.org<mailto:stepanya at jlab.org>>, Tsuneo Kageya <kageya at jlab.org<mailto:kageya at jlab.org>>, Valery Kubarovsky <vpk at jlab.org<mailto:vpk at jlab.org>>, Veronique Ziegler <ziegler at jlab.org<mailto:ziegler at jlab.org>>, Viktor Mokeev <mokeev at jlab.org<mailto:mokeev at jlab.org>>, Volker Burkert <burkert at jlab.org<mailto:burkert at jlab.org>>, Xiangdong Wei <xwei at jlab.org<mailto:xwei at jlab.org>>, Youri Sharabian <youris at jlab.org<mailto:youris at jlab.org>>, Yuri Gotra <gotra at jlab.org<mailto:gotra at jlab.org>>, Rafayel Paremuzyan <rafopar at jlab.org<mailto:rafopar at jlab.org>>, William Phelps <wphelps at jlab.org<mailto:wphelps at jlab.org>>

Hall B virtual seminar

Jiwan Poudel
Old Dominion University

Studies of BONuS12 Radial GEM Detector
and TCS Beam Spin Asymmetry in CLAS12


The Barely Offshell Nucleon Structure (BONuS12) experiment adopted the concept of spectator tagging technique to study the nearly-free neutron structure function Fn2 in the CLAS12 of Jefferson Lab. A novel Radial Time Projection Chamber (RTPC) detector was built, tested, and integrated into the CLAS12 system to detect a back-moving low momentum tagged proton in d(e, ep)X deep-inelastic scattering. It was a 40 cm long gaseous detector consisting of 3 layers of cylindrical GEM foils for the charge amplification, with the data readout directly from the surrounding padboard. The RTPC detected the recoiling spectator proton, in coincidence with the scattered. electron in the CLAS12.
Nucleon structure functions are directly related to the partonic functions, quarks momentum distribution in one dimension. A Generalized Parton Distribution (GPD) came to the lime-light as it encodes the information of both longitudinal momentum and transverse position of partons inside the nucleons. Factorization of the hard process such as DVCS allows to access GPDs. Timelike Compton Scattering (TCS), γp → γ∗p, is another process that allows to access the GPDs. TCS is studied experimentally in the CLAS12 of Jefferson lab using the quasi-real photoproduction of time-like photon which eventually decays to lepton pair. I will present the concept of spectator tagging in BONuS12, and the research and development efforts during the BONuS12 preparation leading up to the successful data-taking during spring and summer 2020, with some preliminary analysis results. In addition, an analysis framework to extract the beam spin asymmetry of TCS events through the CLAS12 Run group A data will also be presented.

Wednesday, March 16, 2022
2:30 pm - 3:30 pm


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