Back-to-back azimuthal correlations in $\mathrm {Z} +$jet events at high transverse momentum in the TMD parton branching method at next-to-leading order

Autor: Yang, Heng, Bermudez Martinez, Armando, Estevez Banos, Luis Ignacio, Hautmann, Francesco, Jung, H., Mendizabal Morentin, Mikel, Moral Figueroa, Keila, Prestel, S., Taheri Monfared, Sara, van Kampen, A. M., Wang, Qun, Wichmann, Katarzyna
Jazyk: angličtina
Rok vydání: 2022
Předmět:
dijet: production
ratio [measure]
multiple production [jet]
Physics and Astronomy (miscellaneous)
transverse momentum: high
Nuclear Theory
showers [parton]
nucl-th
angular correlation [dijet]
interference
FOS: Physical sciences
measure: ratio
parton: distribution function
collinear
high [transverse momentum]
parton: showers
Nuclear Theory (nucl-th)
High Energy Physics - Phenomenology (hep-ph)
jet: multiple production
ddc:530
structure
factorization [scale]
initial state
Nuclear Experiment
Engineering (miscellaneous)
Particle Physics - Phenomenology
scale: renormalization
Physics
higher-order: 1
hep-ph
renormalization [scale]
production [jet]
color
production [dijet]
High Energy Physics - Phenomenology
jet: production
kinematics
Nuclear Physics - Theory
scale: factorization
High Energy Physics::Experiment
dijet: angular correlation
distribution function [parton]
1 [higher-order]
Zdroj: European Physical Journal
European physical journal : C : particles and fields
The European physical journal / C 82(8), 755 (2022). doi:10.1140/epjc/s10052-022-10715-0
ISSN: 1434-6044
DOI: 10.3204/PUBDB-2022-04776
Popis: The European physical journal / C 82(8), 755 (2022). doi:10.1140/epjc/s10052-022-10715-0
Azimuthal correlations in $\mathrm {Z} +$jet production at large transverse momenta are computed by matching Parton-Branching (PB) TMD parton distributions and showers with NLO calculations via MCatNLO. The predictions are compared with those for dijet production in the same kinematic range. The azimuthal correlations $\Delta \phi $ between the Z boson and the leading jet are steeper compared to those in dijet production at transverse momenta $\mathcal{O}(100)$ GeV , while they become similar for very high transverse momenta ${{\mathcal {O}}}(1000)$ GeV . The different patterns of $\mathrm {Z} +$jet and dijet azimuthal correlations can be used to search for potential factorization-breaking effects in the back-to-back region, which depend on the different color and spin structure of the final states and their interferences with the initial states. In order to investigate these effects experimentally, we propose to measure the ratio of the distributions in $\Delta \phi $ for $\mathrm {Z} +$jet- and multijet production at low and at high transverse momenta, and compare the results to predictions obtained assuming factorization. We examine the role of theoretical uncertainties by performing variations of the factorization scale, renormalization scale and matching scale. In particular, we present a comparative study of matching scale uncertainties in the cases of PB-TMD and collinear parton showers.
Published by Springer, Heidelberg
Databáze: OpenAIRE
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