Soft evolution of multi-jet final states - INSPIRE

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Soft evolution of multi-jet final states

Erik Gerwick
(
- Gottingen U., II. Phys. Inst.
)
,
Stefan Hoeche
(
- SLAC
)
,
Simone Marzani
(
- MIT, Cambridge, CTP
)
,
Steffen Schumann
(
- Gottingen U., II. Phys. Inst.
)

Nov 26, 2014

39 pages

Published in:

JHEP 02 (2015) 106

Published: Feb 16, 2015

e-Print:

1411.7325 [hep-ph]

DOI:

10.1007/JHEP02(2015)106

Report number:

SLAC-PUB-16143,
MIT-CTP-4608,
MCNET-14-28

Experiments:

Sherpa

View in:

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Abstract: (Springer)

We present a new framework for computing resummed and matched distributions in processes with many hard QCD jets. The intricate color structure of soft gluon emission at large angles renders resummed calculations highly non-trivial in this case. We automate all ingredients necessary for the color evolution of the soft function at next-to-leading-logarithmic accuracy, namely the selection of the color bases and the projections of color operators and Born amplitudes onto those bases. Explicit results for all QCD processes with up to 2 → 5 partons are given. We also devise a new tree-level matching scheme for resummed calculations which exploits a quasi-local subtraction based on the Catani-Seymour dipole formalism. We implement both resummation and matching in the Sherpa event generator. As a proof of concept, we compute the resummed and matched transverse-thrust distribution for hadronic collisions.

Note:

39 pages, 10 figures. Extended sections 2.0, 2.5 and 3.2. Version accepted by JHEP

QCD Phenomenology
Jets
color: operator
hadron hadron: interaction
quantum chromodynamics
higher-order: 2
tree approximation
resummation
Monte Carlo
wide-angle

References(123)

Figures(0)

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