Back-to-back azimuthal correlations in $$\mathrm {Z} +$$ Z + jet events at high transverse momentum in the TMD parton branching method at next-to-leading order
Abstract Azimuthal correlations in $$\mathrm {Z} +$$ 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 kinemati...
| Main Authors: | , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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SpringerOpen
2022-08-01
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| Series: | European Physical Journal C: Particles and Fields |
| Online Access: | https://doi.org/10.1140/epjc/s10052-022-10715-0 |
| _version_ | 1798004462971781120 |
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| author | H. Yang A. Bermudez Martinez L. I. Estevez Banos F. Hautmann H. Jung M. Mendizabal K. Moral Figueroa S. Prestel S. Taheri Monfared A. M. van Kampen Q. Wang K. Wichmann |
| author_facet | H. Yang A. Bermudez Martinez L. I. Estevez Banos F. Hautmann H. Jung M. Mendizabal K. Moral Figueroa S. Prestel S. Taheri Monfared A. M. van Kampen Q. Wang K. Wichmann |
| author_sort | H. Yang |
| collection | DOAJ |
| description | Abstract Azimuthal correlations in $$\mathrm {Z} +$$ 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 $$\Delta \phi $$ Δ ϕ between the Z boson and the leading jet are steeper compared to those in dijet production at transverse momenta $$\mathcal{O}(100)$$ O ( 100 ) GeV , while they become similar for very high transverse momenta $${{\mathcal {O}}}(1000)$$ O ( 1000 ) GeV . The different patterns of $$\mathrm {Z} +$$ 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 $$\Delta \phi $$ Δ ϕ for $$\mathrm {Z} +$$ 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. |
| first_indexed | 2024-04-11T12:24:10Z |
| format | Article |
| id | doaj.art-dc1a9a34c83a488bba2180d99980254b |
| institution | Directory Open Access Journal |
| issn | 1434-6052 |
| language | English |
| last_indexed | 2024-04-11T12:24:10Z |
| publishDate | 2022-08-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | European Physical Journal C: Particles and Fields |
| spelling | doaj.art-dc1a9a34c83a488bba2180d99980254b2022-12-22T04:24:01ZengSpringerOpenEuropean Physical Journal C: Particles and Fields1434-60522022-08-0182811310.1140/epjc/s10052-022-10715-0Back-to-back azimuthal correlations in $$\mathrm {Z} +$$ Z + jet events at high transverse momentum in the TMD parton branching method at next-to-leading orderH. Yang0A. Bermudez Martinez1L. I. Estevez Banos2F. Hautmann3H. Jung4M. Mendizabal5K. Moral Figueroa6S. Prestel7S. Taheri Monfared8A. M. van Kampen9Q. Wang10K. Wichmann11School of Physics, Peking UniversityDeutsches Elektronen-Synchrotron DESYDeutsches Elektronen-Synchrotron DESYTheoretical Physics Department, CERNDeutsches Elektronen-Synchrotron DESYDeutsches Elektronen-Synchrotron DESYUniversity of EdinburghDepartment of Astronomy and Theoretical Physics, Lund UniversityDeutsches Elektronen-Synchrotron DESYElementary Particle Physics, University of AntwerpSchool of Physics, Peking UniversityDeutsches Elektronen-Synchrotron DESYAbstract Azimuthal correlations in $$\mathrm {Z} +$$ 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 $$\Delta \phi $$ Δ ϕ between the Z boson and the leading jet are steeper compared to those in dijet production at transverse momenta $$\mathcal{O}(100)$$ O ( 100 ) GeV , while they become similar for very high transverse momenta $${{\mathcal {O}}}(1000)$$ O ( 1000 ) GeV . The different patterns of $$\mathrm {Z} +$$ 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 $$\Delta \phi $$ Δ ϕ for $$\mathrm {Z} +$$ 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.https://doi.org/10.1140/epjc/s10052-022-10715-0 |
| spellingShingle | H. Yang A. Bermudez Martinez L. I. Estevez Banos F. Hautmann H. Jung M. Mendizabal K. Moral Figueroa S. Prestel S. Taheri Monfared A. M. van Kampen Q. Wang K. Wichmann Back-to-back azimuthal correlations in $$\mathrm {Z} +$$ Z + jet events at high transverse momentum in the TMD parton branching method at next-to-leading order European Physical Journal C: Particles and Fields |
| title | Back-to-back azimuthal correlations in $$\mathrm {Z} +$$ Z + jet events at high transverse momentum in the TMD parton branching method at next-to-leading order |
| title_full | Back-to-back azimuthal correlations in $$\mathrm {Z} +$$ Z + jet events at high transverse momentum in the TMD parton branching method at next-to-leading order |
| title_fullStr | Back-to-back azimuthal correlations in $$\mathrm {Z} +$$ Z + jet events at high transverse momentum in the TMD parton branching method at next-to-leading order |
| title_full_unstemmed | Back-to-back azimuthal correlations in $$\mathrm {Z} +$$ Z + jet events at high transverse momentum in the TMD parton branching method at next-to-leading order |
| title_short | Back-to-back azimuthal correlations in $$\mathrm {Z} +$$ Z + jet events at high transverse momentum in the TMD parton branching method at next-to-leading order |
| title_sort | back to back azimuthal correlations in mathrm z z jet events at high transverse momentum in the tmd parton branching method at next to leading order |
| url | https://doi.org/10.1140/epjc/s10052-022-10715-0 |
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