TY  - JOUR
AU  - Yang, Heng
AU  - Bermudez Martinez, Armando
AU  - Estevez Banos, Luis Ignacio
AU  - Hautmann, Francesco
AU  - Jung, H.
AU  - Mendizabal Morentin, Mikel
AU  - Moral Figueroa, Keila
AU  - Prestel, S.
AU  - Taheri Monfared, Sara
AU  - van Kampen, A. M.
AU  - Wang, Qun
AU  - Wichmann, Katarzyna
TI  - Back-to-back azimuthal correlations in Z +jet events at high transverse momentum in the TMD parton branching method at next-to-leading order
JO  - The European physical journal / C
VL  - 82
IS  - 8
SN  - 1434-6044
CY  - Heidelberg
PB  - Springer
M1  - PUBDB-2022-00965
M1  - DESY-22-025
M1  - arXiv:2204.01528
M1  - CERN-TH-2022-113
SP  - 755
PY  - 2022
AB  - Azimuthal correlations in 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 ∆ϕ between the Z boson and the leading jet are steeper compared to those in dijet production at transverse momenta <i>O</i>(100) GeV , while they become similar for very high transverse momenta <i>O</i>(1000) GeV . The different patterns of 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 ∆ϕ for 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.
KW  - transverse momentum: high (INSPIRE)
KW  - dijet: production (INSPIRE)
KW  - measure: ratio (INSPIRE)
KW  - parton: showers (INSPIRE)
KW  - jet: production (INSPIRE)
KW  - scale: factorization (INSPIRE)
KW  - jet: multiple production (INSPIRE)
KW  - parton: distribution function (INSPIRE)
KW  - higher-order: 1 (INSPIRE)
KW  - scale: renormalization (INSPIRE)
KW  - dijet: angular correlation (INSPIRE)
KW  - initial state (INSPIRE)
KW  - color (INSPIRE)
KW  - interference (INSPIRE)
KW  - collinear (INSPIRE)
KW  - kinematics (INSPIRE)
KW  - structure (INSPIRE)
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000847353800003
DO  - DOI:10.1140/epjc/s10052-022-10715-0
UR  - https://bib-pubdb1.desy.de/record/474746
ER  -