Author:
Hannesdottir Holmfridur S.,Pathak Aditya,Schwartz Matthew D.,Stewart Iain W.
Abstract
Abstract
We compute the soft-drop jet-mass distribution from pp collisions to NNLL accuracy while including nonperturbative corrections through a field-theory based formalism. Using these calculations, we assess the theoretical uncertainties on an αs precision measurement due to higher order perturbative effects, nonperturbative corrections, and PDF uncertainty. We identify which soft-drop parameters are well-suited for measuring αs, and find that higher-logarithmic resummation has a qualitatively important effect on the shape of the jet-mass distribution. We find that quark jets and gluon jets have similar sensitivity to αs, and emphasize that experimentally distinguishing quark and gluon jets is not required for an αs measurement. We conclude that measuring αs to the 10% level is feasible now, and with improvements in theory a 5% level measurement is possible. Getting down to the 1% level to be competitive with other state-of-the-art measurements will be challenging.
Publisher
Springer Science and Business Media LLC
Subject
Nuclear and High Energy Physics
Reference97 articles.
1. L3 collaboration, Studies of hadronic event structure and comparisons with QCD models at the Z0 resonance, Z. Phys. C 55 (1992) 39 [INSPIRE].
2. SLD collaboration, Measurement of αs($$ {M}_Z^2 $$) from hadronic event observables at the Z0 resonance, Phys. Rev. D 51 (1995) 962 [hep-ex/9501003] [INSPIRE].
3. DELPHI collaboration, Measurement of event shape and inclusive distributions at $$ \sqrt{s} $$ = 130 GeV and 136 GeV, Z. Phys. C 73 (1997) 229 [INSPIRE].
4. ALEPH collaboration, Studies of QCD at e+e− centre-of-mass energies between 91 GeV and 209 GeV, Eur. Phys. J. C 35 (2004) 457 [INSPIRE].
5. DELPHI collaboration, The measurement of αs from event shapes with the DELPHI detector at the highest LEP energies, Eur. Phys. J. C 37 (2004) 1 [hep-ex/0406011] [INSPIRE].
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