Theses and Dissertations

ORCID

https://orcid.org/0000-0003-0087-5387

Issuing Body

Mississippi State University

Advisor

Dutta, Dipangkar

Committee Member

Gaskell, Dave

Committee Member

Dunne, James A.

Committee Member

Winger, Jeff A.

Committee Member

Crider, Ben P.

Date of Degree

5-10-2024

Original embargo terms

Visible MSU only 6 month

Document Type

Dissertation - Open Access

Major

Physics

Degree Name

Doctor of Philosophy (Ph.D.)

College

College of Arts and Sciences

Department

Department of Physics and Astronomy

Abstract

We have measured the flavor dependence of multiplicities for $\\pi^+$ and $\\pi^-$ production in semi-inclusive deep-inelastic scattering (SIDIS) on proton and deuteron targets. We used a 10.6 GeV electron beam at Jefferson Lab, and 4 msr solid angle spectrometers (HMS for electrons, SHMS for pions), the lepton vertex spanned the kinematic range $0.3 < x < 0.6$, $2 < Q^2 < 5$ GeV$^2$, and $4 < W^2 < 11$ GeV$^2$. The pion fractional momentum range was $0.3 < z < 0.7$ and the small transverse momentum range was $0 < P_t < .25$ GeV. We used the multiplicities to form sum-and-difference ratios, testing the validity of factorization. We extracted two favored and two unfavored $W$ dependent fragmentation functions (FFs) from these multiplicities. Assuming factorization at low $P_t$, we find that the two ``favored" FFs allow for isospin breaking (charge symmetry violation) at low $W$, while converging to a common value at the highest $W$ of this experiment. The two unfavored FFs are consistent with each other within the experimental uncertainties.

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