nloaccess

Virtual Access: Automated perturbative NLO calculations for heavy ions and quarkonia (NLOAccess)

This project has been included in the STRONG2020 submission for EU funding.

Christopher Flett

Postal address:

Theory Department, IJCLab, Université Paris-Saclay

15 rue Georges Clémenceau, 91406 – ORSAY Cedex – FRANCE

Office:

Bâtiment 100a

Current Research:

My main activity at present is the implementation of quarkonium cross sections in the well-known event generator MadGraph5_aMC@NLO. The aim is to provide an efficient, all-encompassing tool that anyone can use to simulate quarkonium production at colliders and be versatile enough to handle final states with multiple quarkonium production in association with elementary particles. This will ultimately facilitate the first global NRQCD phenomenological analyses comparing theory and experiment, and enable sound physics-case constructions for current (LHC@CERN, Belle-II@KEK, RHIC@BNL,…) and future (EIC@BNL, FCC@CERN, …) experimental programs.
 
In addition, I am expanding my previous studies on exclusive heavy quarkonium production, with a focus on applying this knowledge to the gluon parton distribution function at moderate-to-low momentum fractions and scales, as well as contributing to future global generalised parton distribution extractions. 
 

Research Activities:

  • Recent scientific-event organisation:
    • Oct 2024-present: Convener, UPC25, Saariselkä, Finland.
    • Jan 2024: Co-organiser and convener, Quarkonia as Tools 2024, Centre Paul Langevin, France.
    • Jan 2023: Co-organiser and convener, Quarkonia as Tools 2023, Centre Paul Langevin, France.
    • Nov 2022: Local Organising Committee Member, QCD@LHC 2022, Orsay, France.
    • Jan 2022: Co-organiser and convener, Quarkonia as Tools 2022, Centre Paul Langevin, France.
  • Reviewer for Physical Review D (PRD), Physics Letters B (PLB), European Physical Journal C (EPJC) & European Physical Journal A (EPJA).
  • Outreach “Life as an Undergrad, Postgrad and Postdoc”, University of Jyväskylä, Finland, outreach seminar and Q&A for new undergraduate students.

Scientific Output:

  • Exclusive vector-quarkonium photoproduction at NLO in alpha_s in collinear factorisation with evolution of the generalised parton distributions and high-energy resummation [arXiv:2409.05738]. By C.A. Flett, J.-P. Lansberg, S. Nabeebaccus, M. Nefedov, P. Sznajder and J.Wagner, 9/09/2024.
  • Physics case for quarkonium studies at the Electron Ion Collider [arXiv:2409.03691]. By D. Boer , C. A. Flett , C. Flore, D. Kikoła, J.-P. Lansberg et al., 5/09/2024.

 

  • QCD challenges from pp to AA collisions: 4th edition [arXiv:2401.09930]. By J. Altmann, [..], C.A. Flett et.al., 23/04/2024, Eur. Phys. J. C 84 (2024) 4, 421, [10.1140/epjc/s10052-024-12650-8].
  • Predictions for exclusive ϒ photoproduction in ultraperipheral Pb+Pb collisions at the LHC to next-to-leading order in perturbative QCD [arXiv:2303.03007]. By K.J. Eskola, C.A. Flett, V. Guzey, T. Löytäinen, H. Paukkunen, 29/08/2023, Eur. Phys. J. C 83 8, 758, [10.1140/epjc/s10052-023-11927-8].
  • Next-to-leading order perturbative QCD predictions for exclusive J/ψ photoproduction in oxygen-oxygen and lead-lead collisions at energies available the CERN Large Hadron Collider [arXiv:2210.16048]. By J.K. Eskola, C.A. Flett, V. Guzey, T. Löytäinen, H. Paukkunen, 28/04/2023, Phys. Rev. C 107 4, 044912, [10.1103/PhysRevC.107.044912].
  • Exclusive J/ψ and ϒ production in high energy pp and pPb collisions [arXiv:2206.10161]. By C.A. Flett, S.P. Jones, A.D. Martin, M.G. Ryskin, T. Teubner, 20/10/2022, Phys. Rev. D 106 7, 074021, [10.1103/PhysRevD.106.074021]. 
  • Exclusive J/ψ photoproduction in ultraperipheral Pb+Pb collisions at the CERN Large Hadron Collider calculated at next-to-leading order perturbative QCD [arXiv:2203.11613]. By K.J. Eskola, C.A. Flett, V. Guzey, T. Löytäinen, H. Paukkunen, 15/09/2022, Phys. Rev. C 106 3, 035202, [10.1103/PhysRevC.106.035202]. Selected for inclusion in the American Physical Society’s outreach to the press.
  • Predictions of exclusive ϒ photoproduction at the LHC and future colliders [arXiv:2110.15575]. By C.A. Flett, S.P. Jones, A.D. Martin, M.G. Ryskin, T. Teubner, 10/02/2022, Phys. Rev. D 105 3, 034008, [10.1103/PhysRevD.105.034008].
  • Prospects for quarkonium studies at the High-Luminosity LHC [arXiv:2012.14161]. By E. Chapon, [..], C.A. Flett et.al., 01/2022, Prog. Part. Nucl. Phys. 122 103906, [10.1016/j.ppnp.2021.103906].
  • Exclusive heavy vector meson electroproduction to NLO in collinear factorisation [arXiv:2105.07657]. By C.A. Flett, J. Gracey, S.P. Jones, T. Teubner, 26/08/2021, JHEP 08 150, [10.1007/JHEP08(2021)150]. 
  • Very low x gluon density determined by LHCb exclusive J /ψ data [arXiv:2006.13857]. By C.A. Flett, A.D. Martin, M.G. Ryskin, T. Teubner, 11/12/2020, Phys. Rev. D 102 114021, [10.1103/PhysRevD.102.114021].
  • How to include exclusive J /ψ production data in global PDF analyses [arXiv:1908.08398]. By C.A. Flett, S.P. Jones, A.D. Martin, M.G. Ryskin, T. Teubner, 13/05/2020, Phys.Rev. D 101, 094011, [10.1103/PhysRevD.101.094011].

Talks:

  • Precision QCD predictions for ep physics at the EIC (III): opportunities with a second IR, Center for Frontiers in Nuclear Science, Stony Brook University, 23-27/09/2024.
  • ICHEP 2024, Prague, Czech Republic, 18/07/2024.
  • Synergies between the LHC and EIC for quarkonium physics LHC, ECT*, Trento, Italy, 8-13/07/2024.
  • Physics with high-luminosity proton-nucleus collisions at the LHC, CERN, Geneva, Switzerland 4-5/07/2024.
  • MC4EIC, Durham, U.K., 5-7/06/2024.
  • NLOAccess/PrecisOnium Meeting, CERN, Geneva, Switzerland, 20-24/11/2023.
  • Assemblée Générale 2023 du GDR-QCD, Strasbourg, France, 27-29/09/2023.
  • MadGraph5_aMC@NLO meeting 2023, Lake Garda, Italy, 17–20/09/2023.
  • QCD@LHC23, Durham, U.K., 4-8/09/2023.
  • QCD Evolution Work-shop 2023, Orsay, Paris, France, 22-26/05/2023.
  • xFitter External Meeting 2023, CERN, Geneva, Switzerland, 2-5/05/2023.
  • QCD challenges from pp to AA collisions, Padova, Italy, 13-17/02/2023.
  • Heavy flavours from small to large systems joint Strong-2020 Meeting ‘recent results and perspectives in hadron physics’, Institute Pascal, Orsay, France, 3-21/10/2022.

 

  • 51st International Symposium on Multiparticle Dynamics, Pitlochry, Scotland, 31/07-5/08/2022.
  • Joint ALICE UPC meeting & Forward QCD: open questions and future directions, Lawrence, Kansas, 23-27/05/2022.
  • DIS2022: XXIX International workshop on Deep Inelastic Scattering and Related Subjects, Santiago de Compestela, Spain, 2-6/05/2022.
  • Particle Physics Day 2021, Annual meeting of the Particle Physics Division of the Finnish Physical Society, Jyväskylä, Finland, 16/11/2021.
  • 12th International workshop on Multiple Partonic Interactions at the LHC, LIP Lisbon, 11-15/10/2021.
  • Joint Kickoff Meeting GDR-QCD & Aussois Quarkonium and QCD Meeting, 23/07/2021.
  • Quarkonia as Tools 2020, Centre Paul Langevin, 12-18/01/2020.
  • Implications of LHCb measurements and future prospects, CERN, Switzerland, 16-18/10/2019.
  • Light Cone 2019 – QCD on the light cone: From Hadrons to Heavy Ions, Ecole Polytechnique, France, 16-20/09/2019.
  • DIS2019: XXVII International Workshop on Deep Inelastic Scattering and Related Subjects, University of Turin, Italy, 8-12/04/2019.
  • Quarkonia as Tools 2019, Centre Paul Langevin, France, 13-19/01/2019.

Education and Research Experience:

  • Postdoctoral Researcher (Université Paris-Saclay, CNRS, IJCLab, 2022 – present); supported by IN2P3. 
  • Postdoctoral Researcher (University of Jyväskylä, 2020-2022); supported by the “HIP Theory Project: QCD”.

 

  • PhD student in the Department of Mathematical Sciences (University of Liverpool, 2016-2020); supervisor: Prof. T. Teubner; supported by STFC.
  • MPhys (Master of Physics, Hons) Mathematical Physics (University of Edinburgh, 2011–2016); First Class Hons.