N-jettiness subtractions for gg → H at subleading power
Name
PhysRevD.97.014013.pdf
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1.29 MB
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Author(s)
Moult, Ian
Rothen, Lorena
Tackmann, Frank J.
Stewart, Iain W
Zhu, HuaXing
Date Issued
January 2018
Journal
Physical Review D
Publisher
American Physical Society
Citation
Moult, Ian, et al. “N -Jettiness Subtractions for gg → H at Subleading Power.” Physical Review D, vol. 97, no. 1, Jan. 2018. © 2018 American Physical Society
Version
Final published version
Abstract
N-jettiness subtractions provide a general approach for performing fully-differential next-to-next-to-leading order (NNLO) calculations. Since they are based on the physical resolution variable N-jettiness, T[subscript N], subleading power corrections in τ=T[subscript N]/Q, with Q a hard interaction scale, can also be systematically computed. We study the structure of power corrections for 0-jettiness, T[subscript 0], for the gg→H process. Using the soft-collinear effective theory we analytically compute the leading power corrections α[subscript s]τlnτ and α[subscript s][superscript 2]τln][superscript 3]τ (finding partial agreement with a previous result in the literature), and perform a detailed numerical study of the power corrections in the gg, gq, and q[¯ over q] channels. This includes a numerical extraction of the α[subscript s]τ and α[subscript s][superscript 2]τln[superscript 2]τ corrections, and a study of the dependence on the T[subscript 0] definition. Including such power suppressed logarithms significantly reduces the size of missing power corrections, and hence improves the numerical efficiency of the subtraction method. Having a more detailed understanding of the power corrections for both q[¯ over q] and gg initiated processes also provides insight into their universality, and hence their behavior in more complicated processes where they have not yet been analytically calculated.
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.97.014013
