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Title: Helicity methods for high multiplicity subleading soft and collinear limits

Journal Article · · Journal of High Energy Physics (Online)
 [1];  [2];  [1]; ORCiD logo [1]
  1. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  2. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

The factorization of multi-leg gauge theory amplitudes in the soft and collinear limits provides strong constraints on the structure of amplitudes, and enables efficient calculations of multi-jet observables at the LHC. There is significant interest in extending this understanding to include subleading powers in the soft and collinear limits. While this has been achieved for low point amplitudes, for higher point functions there is a proliferation of variables and more complicated phase space, making the analysis more challenging. By combining the subleading power expansion of spinor-helicity variables in collinear limits with consistency relations derived from the soft collinear effective theory, we show how to efficiently extract the subleading power leading logarithms of N-jet event shape observables directly from known spinor-helicity amplitudes. At subleading power, we observe the presence of power law singularities arising solely from the expansion of the amplitudes, which for hadron collider event shapes lead to the presence of derivatives of parton distributions. The techniques introduced here can be used to efficiently compute the power corrections for N-jettiness subtractions for processes involving jets at the LHC.

Research Organization:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Nuclear Physics (NP); USDOE Office of Science (SC), High Energy Physics (HEP)
Grant/Contract Number:
SC0011090; AC02-05CH11231
OSTI ID:
1635396
Journal Information:
Journal of High Energy Physics (Online), Vol. 2019, Issue 5; ISSN 1029-8479
Publisher:
Springer BerlinCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 21 works
Citation information provided by
Web of Science

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Cited By (5)

Higher-order power corrections in a transverse-momentum cut for colour-singlet production at NLO journal October 2019
Impact of isolation and fiducial cuts on qT and N-jettiness subtractions text January 2020
Impact of Isolation and Fiducial Cuts on $q_T$ and N-Jettiness Subtractions text January 2019
Diagrammatic resummation of leading-logarithmic threshold effects at next-to-leading power text January 2019
Higher-order power corrections in a transverse-momentum cut for colour-singlet production at NLO text January 2019

Figures / Tables (2)


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