[Nuclear] [EXTERNAL] DNP Abstract Review

[Lamiaa El-Fassi]

Dear NPWG members,

Please have a look at the enclosed APS DNP abstract by Brandon Tumeo and
Sebouh Paul and send them any feedback you might have. The abstract
submission deadline is the upcoming Thursday, July 1st.

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Abstract 1: "Feasibility Study for Λd Elastic Scattering" by Brandon
**********
Experimental observables of Λ-deuteron (Λd) elastic scattering are expected
to provide unique and independent constraints on several poorly-known
dynamical parameters of the hyperon-nucleon interaction, such as the
Λ*N *spin-triplet
scattering length and of the Λ*NN *three-body force. Yet, Λd experimental
data are non-existent. In this work, we present a feasibility study of Λd
elastic scattering using the high-luminosity Jefferson Lab experiment
E06-103, in which a real-photon beam was incident on a 40-cm long liquid
deuterium target. The data were taken with the CEBAF Large Acceptance
Spectrometer (CLAS) housed in Hall B. The Λ beam is produced in
photoproduction off a deuteron and then scattered elastically off another
deuteron. By detecting the final-state deuteron, and the proton and pion
from Λ decay, reconstruction of the scattered and beam Λ invariant masses,
and reaction selection was possible. Our analysis shows that the data set
contains about 4000 Λd elastic events, covering Λ beam momenta between 600
MeV/c and 1000 MeV/c and Λ center-of-mass cos(theta) between -0.6 and +0.8.
Thus, for the first time, the Λd elastic differential and total cross
sections will be extracted.
************
Abstract 2: "Di-hadron azimuthal correlations in *e-A* DIS with CLAS" by
Sebouh
**********
We present a measurement of the nuclear dependence of di-hadron production
in deep inelastic scattering off nuclei using the CLAS detector at
Jefferson Lab. We report results on the conditional suppression factor for
charged pions using carbon, iron and lead data. By comparing our results
with single-hadron measurements, we can constrain correlations created by
nuclear effects. Our results are much more precise than the HERMES data
(PRL 96, 162301) and include hadron identification. We also complement the
HERMES measurements by reporting the first measurement of azimuthal and
rapidity correlations in DIS, which shows a strong suppression for
back-to-back pion pairs in nuclei, whereas there is an enhancement for such
pairs where the azimuthal and rapidity separations are both small.  This
represents a new type of study in electron-nucleus collisions and serves as
a pathfinder for future experiments with CLAS12 and the Electron-Ion
Collider.
-------------------------------------


Best,

Lamiaa

*****************************************************************************
* Assoc. Prof. Lamiaa El Fassi  /  email: le334 at msstate.edu
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* Phone: (662) 325-0627    /    Fax:  (662) 325-8898
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<https://urldefense.proofpoint.com/v2/url?u=http-3A__le334.physics.msstate.edu_&d=DwIFaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=oFpNaB86z9R0_Cm6JnqHFw&m=7SqEmf4Mol9VX8TCdIeWEl_-D29NlEdCYPSpV7sLm-4&s=FGKVHJViDHlcOgujBRdqEXl5ZbCEYQ-mlXdodJBYRfs&e= >
* Department of Physics and Astronomy
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