A subleading power operator basis for the scalar quark current
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13130_2018_Article_8026.pdf
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Author(s)
Chang, Cyuan-Han
Stewart, Iain W
Vita, Gherardo
Date Issued
April 2018
Journal
Journal of High Energy Physics
Publisher
Springer Berlin Heidelberg
Citation
Chang, Cyuan-Han et al. "A subleading power operator basis for the scalar quark current." Journal of High Energy Physics 2018 (April 2018) : 41 © 2018 The Authors
Version
Final published version
Abstract
Factorization theorems play a crucial role in our understanding of the strong interaction. For collider processes they are typically formulated at leading power and much less is known about power corrections in the λ ≪ 1 expansion. Here we present a complete basis of power suppressed operators for a scalar quark current at O (λ][superscript 2]) in the amplitude level power expansion in the Soft Collinear Effective Theory, demonstrating that helicity selection rules significantly simplify the construction. This basis applies for the production of any color singlet scalar in q[bar over q] annihilation (such as b[bar over b] → H). We also classify all operators which contribute to the cross section at O(λ[superscript 2]) and perform matching calculations to determine their tree level Wilson coefficients. These results can be exploited to study power corrections in both resummed and fixed order perturbation theory, and for analyzing the factorization properties of gauge theory amplitudes and cross sections at subleading power.
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/10.1007/JHEP04(2018)041
