Exclusive Photoproduction of Heavy Vector Mesons in Ultraperipheral Nuclear Collisions
Julkaistu sarjassa
JYU dissertationsTekijät
Päivämäärä
2023Tekijänoikeudet
© The Author & University of Jyväskylä
This thesis investigates the possibility of describing coherent exclusive photoproduction
of heavy-vector mesons in ultraperipheral heavy-ion collisions (UPCs) by
using inclusive collinearly factorizable parton distribution functions (PDFs). The
aim is to chart the scale dependence and the PDF-originated uncertainties of such
photoproduction cross sections, arising in the approximation where the generalized
parton distributions (GPDs) are simply approximated by their forward limit counter
parts, i.e., the PDFs. The introductory part presents the PDFs and GPDs in their
physics contexts, their connection to each other and to the nuclear ones, shows the
full leading order (LO) calculation of the photoproduction amplitude in perturbative
quantum chromodynamics (pQCD) and describes the way the quark contribution
arises at next-to-leading order (NLO). Furthermore, details of the required modeling
of the form factors and photon fluxes are described before finally collecting everything
together for the nucleus-nucleus UPCs.
The described framework is the basis on which most of the results of the
papers [PI, PII, PIII] rely. Article [PI] was the very first NLO pQCD study of rapidity
differential cross sections of coherent exclusive photoproduction of J/ψ mesons in
lead-lead UPCs. Article [PII] extended the results to the case of oxygen-oxygen
collisions and studied the possibility of constraining the strong scale dependence
of the results of article [PI] through suitably chosen ratios of cross sections. Then
finally in article [PIII] the framework was extended to the case of U mesons with the
addition of the skewing correction through the Shuvaev transform.
The results show the importance of the ERBL region for a strongly growing
gluon PDF but other than that no tight constraints for the gluons were found.
Surprisingly, sensitivity to the quark PDFs was discovered in the J/ψ case, due
to which the studied process may be a probe of the elusive strangeness content of
bound nucleons. The sensitivity originates from the cancelling nature of the LO and
NLO gluon contributions in the scattering amplitude. This thesis paves the way
towards including the studied exclusive processes as constraints in the global analysis
of PDFs and their nuclear counterparts.
Keywords: Particle interactions, particle phenomena, particle production, quantum
Julkaisija
Jyväskylän yliopistoISBN
978-951-39-9577-5ISSN Hae Julkaisufoorumista
2489-9003Julkaisuun sisältyy osajulkaisuja
- Artikkeli I: Eskola, K. J., Flett, C. A., Guzey, V., Löytäinen, T., & Paukkunen, H. (2022). Exclusive J/ψ photoproduction in ultraperipheral Pb+Pb collisions at the CERN Large Hadron Collider calculated at next-to-leading order perturbative QCD. Physical Review C, 106(3), Article 035202. DOI: 10.1103/PhysRevC.106.035202
- Artikkeli II: Eskola, K. J., Flett, C. A., Guzey, V., Löytäinen, T., & Paukkunen, H. (2023). Next-to-leading order perturbative QCD predictions for exclusive J/ψ photoproduction in oxygen-oxygen and lead-lead collisions at energies available at the CERN Large Hadron Collider. Physical Review C, 107(4), Article 044912. DOI: 10.1103/PhysRevC.107.044912
- Artikkeli III: Eskola, K. J., Flett, C. A., Guzey, V., Löytäinen, T. and Paukkunen, H. Predictions for exclusive Υ photoproduction in ultraperipheral Pb+Pb collisions at the LHC at next-to-leading order in perturbative QCD. Submitted. Preprint
Metadata
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- JYU Dissertations [806]
- Väitöskirjat [3515]
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Guzey, Vadim; Kryshen, E.; Zhalov, M. (Elsevier BV, 2018)We make predictions for cross sections of ρ and φ vector meson photoproduction in ultraperipheral Xe–Xe collisions at √sN N = 5.44 TeV. Analyzing the momentum transfer distribution of ρ mesons in this process, we explore ... -
Energy dependence of exclusive J/ψ photoproduction off protons in ultra-peripheral p–Pb collisions at √sNN = 5.02 TeV
ALICE Collaboration (Springer Berlin Heidelberg, 2019)The ALICE Collaboration has measured the energy dependence of exclusive photoproduction of J/ψJ/ψ vector mesons off proton targets in ultra–peripheral p–Pb collisions at a centre-of-mass energy per nucleon pair ... -
Exclusive J/ψ photoproduction in ultraperipheral Pb+Pb collisions at the CERN Large Hadron Collider calculated at next-to-leading order perturbative QCD
Eskola, K. J.; Flett, C. A.; Guzey, V.; Löytäinen, T.; Paukkunen, H. (American Physical Society (APS), 2022)We present the first next-to-leading-order (NLO) perturbative QCD (pQCD) study of rapidity-differential cross sections of coherent exclusive photoproduction of J/ψ mesons in heavy-ion ultraperipheral collisions (UPCs) at ... -
Predictions for exclusive Υ photoproduction in ultraperipheral Pb+Pb collisions at the LHC at next-to-leading order in perturbative QCD
Eskola, Kari J.; Flett, Christopher A.; Guzey, Vadim; Löytäinen, Topi; Paukkunen, Hannu (Springer, 2023)We present predictions for the rapidity-differential cross sections of exclusive Υ photoproduction in ultraperipheral collisions (UPCs) of lead ions at the Large Hadron Collider (LHC). We work in the framework of collinear ... -
Exclusive J=ψ Photoproduction off Protons in Ultraperipheral p-Pb Collisions at √sNN = 5.02 TeV
ALICE Collaboration (American Physical Society, 2014)
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