Polarized fragmenting jet functions in inclusive and exclusive jet production
Name
13130_2024_Article_23086.pdf
Size
1.08 MB
Format
Adobe PDF
Checksum (MD5)
64d1101344b2e9fb64ed18eca0ad1907
Author(s)
Kang, Zhong-Bo
Xing, Hongxi
Zhao, Fanyi
Zhou, Yiyu
Date Issued
March 26, 2024
Journal
Journal of High Energy Physics
Publisher
Springer Science and Business Media LLC
Citation
Journal of High Energy Physics. 2024 Mar 26;2024(3):142
Version
Final published version
Abstract
In this work, we present a complete theoretical framework for analyzing the distribution of polarized hadrons within jets, with and without measuring the transverse momentum relative to the standard jet axis. Using soft-collinear effective theory (SCET), we derive the factorization and provide the theoretical calculation of both semi-inclusive and exclusive fragmenting jet functions (FJFs) under longitudinal and transverse polarization. With the polarized FJFs, one gains access to a variety of new observables that can be used for extracting both collinear and transverse momentum dependent parton distribution functions (PDFs) and fragmentation functions (FFs). As examples, we provide numerical results for the spin asymmetry
A
TU
,
T
cos
ϕ
S
−
ϕ
̂
S
h
$$ {A}_{TU,T}^{\cos \left({\phi}_S-{\hat{\phi}}_{S_h}\right)} $$
from polarized semi-inclusive hadron-in-jet production in polarized pp collisions at RHIC kinematics, where a transversely polarized quark would lead to the transverse spin of the final-state hadron inside the jet and is thus sensitive to the transversity fragmentation functions. Similarly, another spin asymmetry,
A
TU
,
L
cos
ϕ
q
−
ϕ
S
$$ {A}_{TU,L}^{\cos \left({\phi}_q-{\phi}_S\right)} $$
from polarized exclusive hadron-in-jet production in polarized ep collisions at EIC kinematics would allow us to access the helicity fragmentation functions. These observables demonstrate promising potential in investigating transverse momentum dependent PDFs and FFs and are worthwhile for further measurements.
Subjects
Nuclear and High Energy Physics
MIT Department
Massachusetts Institute of Technology. Center for Theoretical Physics
Terms of Use
Creative Commons Attribution
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1007/jhep03(2024)142
