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

Yang, Heng; Taheri Monfared, Sara; Wang, Qun; Moral Figueroa, Keila; Mendizabal Morentin, Mikel; Estevez Banos, Luis Ignacio; van Kampen, A. M.; Bermudez Martinez, Armando; Hautmann, Francesco; Prestel, S.; Wichmann, Katarzyna; Jung, H.

Preprint

PUBDB-2022-04776

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

Yang, H.Extern* ; Bermudez Martinez, A.DESY* ; Estevez Banos, L. I.DESY* ; Hautmann, F.Extern* ; Jung, H. (Corresponding author)Extern*DESY* ; Mendizabal Morentin, M.DESY* ; Moral Figueroa, K. ; Prestel, S.DESY* ; Taheri Monfared, S.DESY* ; van Kampen, A. M. ; Wang, Q.DESY* ; Wichmann, K.DESY*

2022

[10.3204/PUBDB-2022-04776]

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Please use a persistent id in citations: doi:10.3204/PUBDB-2022-04776

Report No.: CERN-TH-2022-113; DESY-22-025; arXiv:2204.01528

Abstract: 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.

Keyword(s): transverse momentum: high ; dijet: production ; measure: ratio ; parton: showers ; jet: production ; scale: factorization ; jet: multiple production ; parton: distribution function ; higher-order: 1 ; scale: renormalization ; dijet: angular correlation ; initial state ; color ; interference ; collinear ; kinematics ; structure