Using 1-jettiness to measure 2 jets in DIS 3 ways
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Kang-2013-Using 1-jettiness.pdf
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Author(s)
Kang, Daekyoung
Lee, Christopher
Stewart, Iain
Date Issued
September 2013
Journal
Physical Review D
Publisher
American Physical Society
Citation
Kang, Daekyoung, Christopher Lee, and Iain W. Stewart. “Using 1-jettiness to measure 2 jets in DIS 3 ways.” Physical Review D 88, no. 5 (September 2013). © 2013 American Physical Society
Version
Final published version
Abstract
We predict cross sections in deep inelastic scattering (DIS) for the production of two jets—one along the proton beam direction created by initial-state radiation (ISR) and another created by final-state radiation after the hard collision. Our results include fixed-order corrections and a summation of large logarithms up to next-to-next-to-leading logarithmic accuracy in resummed perturbation theory. We make predictions for three versions of a DIS event shape 1-jettiness, each of which constrains hadronic final states to be well collimated into two jets along the beam and final-state jet directions, but which differ in their sensitivity to the transverse momentum of the ISR from the proton beam. We use the tools of soft collinear effective theory to derive factorization theorems for these three versions of 1-jettiness. The sensitivity to the ISR gives rise to significantly different structures in the corresponding factorization theorems—for example, dependence on either the ordinary or the generalized k[subscript ⊥]-dependent beam function. Despite the differences among 1-jettiness definitions, we show that the leading nonperturbative correction that shifts the tail region of their distributions is given by a single universal nonperturbative parameter Ω[subscript 1], even accounting for hadron mass effects. Finally, we give numerical results for Q[superscript 2] and x values explored at the HERA collider, emphasizing that the target of our factorization-based analyses is to open the door for higher-precision jet phenomenology in DIS.
MIT Department
Massachusetts Institute of Technology. Center for Theoretical Physics
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1103/PhysRevD.88.054004
