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Low-x 2023

3–8 Sept 2023
Leros island, Greece
Europe/Rome timezone

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Contribution List

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  1. 85. Welcome
    Christophe Royon (The University of Kansas (US)), Fotios Ptochos (University of Cyprus (CY)), Dr Georgios Krintiras (The University of Kansas (US))
    04/09/2023, 09:00
  2. 86. PDFs and QCD fits
    Amanda Sarkar (University of Oxford (GB))
    04/09/2023, 09:10
  3. 87. CMS jet measurements and constraints on PDFs and alphaS
    Achim Geiser (Deutsches Elektronen-Synchrotron (DE))
    04/09/2023, 09:40
  4. 88. Recent Progress in PDF Determination
    Dr Tanjona R. Rabemananjara (NIKHEF & VU Amsterdam), Tanjona Radonirina Rabemananjara (CERN)
    04/09/2023, 10:10
  5. 89. Beyond LO for hybrid kT-factorization
    Andreas van Hameren
    04/09/2023, 11:10
  6. 90. Next-to-leading order photon+jet production
    Yair Mulian
    04/09/2023, 11:40
  7. 91. Discussion: PDFs, QCD fits
    Amanda Sarkar (University of Oxford (GB)), Dr Tanjona R. Rabemananjara (NIKHEF & VU Amsterdam)
    04/09/2023, 12:10
  8. 92. Recent TOTEM results
    Christophe Royon (The University of Kansas (US))
    04/09/2023, 14:00
  9. 93. Lévy α-stable model for the non-exponential low-|t| proton-proton differential cross section
    Istvan Szanyi (Eötvös University, Wigner RCP, MATE KRC), Mr István Szanyi (Eötvös Loránd University)
    04/09/2023, 14:30
  10. 94. Nonresonant central exclusive production of charged hadron pairs in proton-proton collisions at 13 TeV in CMS and TOTEM
    Ferenc Siklér (Wigner RCP, Budapest (HU))
    04/09/2023, 15:30
  11. 95. Physics potential of a combined data-taking of the LHCf and ATLAS Roman Pot detectors
    Clara Elisabeth Leitgeb (Deutsches Elektronen-Synchrotron (DE))
    04/09/2023, 16:00
  12. 96. Single and double photon bremsstrahlung in pp to pp at the LHC
    Antoni Szczurek
    04/09/2023, 16:30
  13. 97. Imaging the odderon from exclusive eta_c production at the EIC
    Sanjin Benić
    04/09/2023, 17:00
  14. 98. Discussion: soft diffraction
    Christophe Royon (The University of Kansas (US)), Ferenc Siklér (Wigner RCP, Budapest (HU))
    04/09/2023, 17:30
  15. 105. Probing gluon saturation with diffractive jets in photon-nucleus interactions
    Edmond Iancu (Université Paris-Saclay (FR))
    05/09/2023, 09:00
  16. 106. Back-to-back dijets at the EIC: small x and Sudakov resummation
    Tomasz Stebel (CERN), Tomasz Stebel (Institute of Theoretical Physics Jagiellonian University)
    05/09/2023, 09:30
  17. 107. Gluon contributions to DVCS, TCS and DDVCS from low to moderate x
    Renaud BOUSSARIE (CPHT, CNRS, Ecole polytechnique, IP Paris)
    05/09/2023, 10:00
  18. 108. Measuring forward dijet at the LHC as a probe for saturation using a full impact parameter dependent TMDs
    Federico Deganutti
    05/09/2023, 11:00
  19. 109. Incoherent diffractive dijet production in electron DIS off large nuclei
    Dionysios Triantafyllopoulos (ECT*/FBK)
    05/09/2023, 11:30
  20. 110. Discussion: BFKL, saturation
    Dionysios Triantafyllopoulos (ECT*/FBK), Edmond Iancu (Université Paris-Saclay (FR)), Renaud BOUSSARIE (CPHT, CNRS, Ecole polytechnique, IP Paris)
    05/09/2023, 12:00
  21. 99. Recent results from PPS
    Andrea Bellora (Universita e INFN Torino (IT))
    05/09/2023, 14:00
  22. 100. Overview of ATLAS forward proton detectors: status, performance and new physics results
    Adrien Auriol (University of Birmingham (GB))
    05/09/2023, 14:30
  23. 101. Hunting for QCD Instantons at the LHC in the forward proton mode
    Valery Khoze (University of Durham (GB))
    05/09/2023, 15:30
  24. 102. Diffractive measurements in pp and pA collisions
    Michael Pitt (The University of Kansas (US))
    05/09/2023, 16:00
  25. 135. Search for effective lorentz violation and CPT violation in ZEUS data
    Amanda Sarkar (University of Oxford (GB))
    05/09/2023, 16:30
  26. 104. Discussion: Hard diffraction and photon exchanges
    Antoni Szczurek, Leszek Motyka, Michael Pitt (The University of Kansas (US))
    05/09/2023, 17:00
  27. 111. Exclusive particle production in heavy ion at CMS
    Dr Georgios Krintiras (The University of Kansas (US))
    06/09/2023, 09:00
  28. 112. Coherent J/Psi production in Pb Pb collisions in the CMS experiment at the LHC
    Luis Alcerro Alcerro (The University of Kansas (US))
    06/09/2023, 09:30
  29. 113. Gamma gamma to gamma gamma scattering in UPC with ALICE 3 and FoCal
    Antoni Szczurek
    06/09/2023, 10:00
  30. 114. Search for elliptic azimuthal anisotropies in photon-proton and pomeron-Pb interactions using rapidity gaps at pPb collisions with the CMS experiment
    Javier Alberto Murillo Quijada (Universidad de Sonora (MX))
    06/09/2023, 11:00
  31. 115. Exclusive vector meson production with Sartre using machine learning in eA collision
    Jaswant Singh (Indian Institute of Technology New Delhi)
    06/09/2023, 11:30
  32. 116. Discussion: Heavy ions
    Dr Georgios Krintiras (The University of Kansas (US)), Javier Alberto Murillo Quijada (Universidad de Sonora (MX))
    06/09/2023, 12:00
  33. 117. Measurement and QCD analysis of inclusive jet production in deep inelastic scattering at HERA
    Achim Geiser (Deutsches Elektronen-Synchrotron (DE))
    07/09/2023, 09:00
  34. 138. Associated production of vector bosons and heavy flavours in CMS
    Michael Pitt (The University of Kansas (US))
    07/09/2023, 09:30
  35. 119. Mueller-Tang Jets at Next-to-Leading Order and Violation of BFKL Factorization
    Federico Deganutti
    07/09/2023, 10:00
  36. 120. Measurement of the azimuthal decorrelation angle between the leading jet and the scattered lepton in deep inelastic scattering at HERA
    Prof. Bernd Surrow (Temple University)
    07/09/2023, 11:00
  37. 118. Jet substructure measurements in CMS
    Christophe Royon (The University of Kansas (US))
    07/09/2023, 11:30
  38. 122. Discussion: jets
    Achim Geiser (Deutsches Elektronen-Synchrotron (DE)), Armando Bermudez Martinez (CERN), Jean-Philippe Lansberg (Université Paris-Saclay (FR))
    07/09/2023, 12:00
  39. 123. Low x physics at the EIC
    Prof. Bernd Surrow (Temple University)
    07/09/2023, 14:00
  40. 133. Geometric scaling in leading neutron events at HERA
    Mr Arjun Kumar (Indian Institute of Technology Delhi)
    07/09/2023, 14:30
  41. 103. The LHC as a Neutrino-Ion Collider: FPF case studies
    Dr Tanjona R. Rabemananjara (NIKHEF & VU Amsterdam), Tanjona Radonirina Rabemananjara (CERN)
    07/09/2023, 15:30
  42. 134. Factorisation of 1-loop amplitudes in NMRK limits
    Emmet Byrne
    07/09/2023, 16:00
  43. 129. Discussion: low x, saturation, final states
    Renaud BOUSSARIE (CPHT, CNRS, Ecole polytechnique, IP Paris)
    07/09/2023, 16:30
  44. 130. QCD corrections to quarkonium production
    Jean-Philippe Lansberg (Ecole Polytechnique), Jean-Philippe Lansberg (Ecole polytechnique), Jean-Philippe Lansberg (Université Paris-Saclay (FR))
    08/09/2023, 09:00
  45. 131. Computing one-loop corrections to quarkonium production impact-factors with Lipatov's EFT
    Dr Maxim Nefedov (IJClab, Orsay)
    08/09/2023, 09:30
  46. 136. On color reconnection effects in J/psi hadroproduction
    Leszek Motyka
    08/09/2023, 10:00
  47. 137. New results constraining transversity in high-energy polarized p+p collisions
    Prof. Bernd Surrow (Temple University)
    08/09/2023, 11:00
  48. 143. Recent results on direct determination of the Collins-Soper kernel and how to measure it at the LHC?
    Armando Bermudez Martinez (CERN)
    08/09/2023, 11:30
  49. 139. Discussion: final states, quarkonium
    Achim Geiser (Deutsches Elektronen-Synchrotron (DE)), Armando Bermudez Martinez (CERN), Jean-Philippe Lansberg (Université Paris-Saclay (FR))
    08/09/2023, 12:00
  50. 140. Dilepton and diphoton production and BSM searches with UPC photon fusion processes in Pb+Pb collisions with the ATLAS detector
    Melike Akbiyik (Johannes Gutenberg Universitaet Mainz (DE))
    08/09/2023, 14:00
  51. 141. Transverse analyzing power measurement in the high energy forward pp and pA scattering at RHIC hydrogen jet target polarimeter
    Andrei Poblaguev (Brookhaven National Laboratory)
    08/09/2023, 14:30
  52. 142. The LHCspin project
    Marco Santimaria (INFN e Laboratori Nazionali di Frascati (IT))
    08/09/2023, 15:30
  53. 144. On the exact solution for the Schrödinger equation
    Yair Mulian
    08/09/2023, 16:00
  54. 121. V+jets production in CMS
    Sorina Popescu (F), Sorina Popescu (The University of Kansas (US))
    08/09/2023, 16:30
  55. 145. Discussion: final states
    Achim Geiser (Deutsches Elektronen-Synchrotron (DE)), Armando Bermudez Martinez (CERN), Jean-Philippe Lansberg (Université Paris-Saclay (FR))
    08/09/2023, 17:00
  56. 146. Workshop conclusion
    Christophe Royon (The University of Kansas (US)), Fotios Ptochos (University of Cyprus (CY)), Dr Georgios Krintiras (The University of Kansas (US))
    08/09/2023, 17:30
  57. 127. Associated production of vector bosons and heavy flavours in CMS
    Michael Pitt (The University of Kansas (US))
  58. 80. Back-to-back dijets at the EIC: small x and Sudakov resummation
    Tomasz Stebel (Institute of Theoretical Physics Jagiellonian University)

    We present our recent calculation of the dijet electroproduction cross section at the NLO accuracy within the Color Glass Condensate effective field theory. We focus on kinematical regime where the two jets are forward w.r.t. projectile's longitudinal direction and are almost back-to-back in transverse plain. We discuss the interplay between small-x and Sudakov resummation and show numerical...

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  59. 78. Computing one-loop corrections to quarkonium production impact-factors with Lipatov's EFT
    Dr Maxim Nefedov (IJClab, Orsay)

    The formalism of gauge-invariant EFT for Multi-Regge processes in QCD is used to compute impact-factors relevant for processes of production of heavy quarkonia within Non-Relativistic QCD Factorisation formalism and High-Energy Factorisation at one-loop accuracy. The examples of $\gamma+R\to c\bar{c}\left[{}^1S_0^{[8]}\right]$ and $g+R\to c\bar{c}\left[{}^1S_0^{[1]}\right]$ impact factors will...

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  60. 124. Dilepton and diphoton production and BSM searches with UPC photon fusion processes in Pb+Pb collisions with the ATLAS detector
    Melike Akbiyik (Johannes Gutenberg Universitaet Mainz (DE))
  61. 65. Exclusive vector meson production with Sar$t$re using machine learning in eA collision.
    Jaswant Singh (Indian Institute of Technology New Delhi)

    We use Machine Learning with the event-generator (Sar$t$re) for
    the for exclusive diffraction processes in electron-nucleus scattering. The second moment of the amplitude includes averaging of hundreds of initial nucleon configurations of the heavy nucleus, a procedure which is extremely CPU intense. We show that we can make the production of the cross-sections used for event generation at...

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  62. 81. Factorisation of 1-loop amplitudes in NMRK limits
    Emmet Byrne

    There has been much recent progress towards extending the BFKL equation to next-to-next-to-leading logarithmic (NNLL) accuracy. In this talk I will briefly review the status of this programme of research. I will then discuss our recent progress in extracting some of the missing ingredients of the NNLL kernel, including the one-loop central-emission vertex (CEV) for two gluons which are not...

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  63. 70. Geometric scaling in leading neutron events at HERA
    Arjun Kumar (Indian Institute of Technology Delhi)

    This analysis provides new fits of the GBW model and the impact parameter-dependent saturation model (bSat or IP-Sat) to the leading neutron structure function HERA data in one-pion exchange approximation. Both parametrizations of the dipole cross section provide good descriptions of the considered data. It is shown here for the first time that the experimental leading neutron production HERA...

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  64. 71. Hadron production and forward proton measurements with ATLAS
    ATLAS Collaboration

    Measurements of hadron production provide important insight about the quark and gluon fragmentation that are relevant for the simulation of kinematic distributions of high-energy collisions. The measurement of charged particle distributions using LHC proton-proton data collected at 13.6 TeV of centre-of-mass energy will be presented. The differences in the production with and without...

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  65. 79. Imaging the odderon from exclusive eta_c production at the EIC
    Sanjin Benić

    In this contribution I would like to report on our recent findings [1] regarding the exclusive eta_c production in e+p and e+A collisions that is sensitive to the Odderon. We are working within the framework of Color Glass Condensate applicable at the high energies that would be reached at future electron ion colliders. The Odderon distribution at small-x is found by explicitly solving the...

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  66. 72. Jet, heavy flavour and photon production at ATLAS
    ATLAS Collaboration

    The production of jets and prompt isolated photons at hadron colliders provides stringent tests of perturbative QCD. The most recent measurements in this area by the ATLAS experiment, using proton-proton collision data at $\sqrt{s}$ =13 TeV, are presented. Prompt inclusive photon production is measured for two distinct photon isolation cones, R=0.2 and 0.4, as well as for their ratio. The...

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  67. 82. Lévy α-stable model for the non-exponential low-|t| proton-proton differential cross section
    Istvan Szanyi (Eötvös University, Wigner RCP, MATE KRC)

    It is known that the Real Extended Bialas-Bzdak (ReBB) model describes the proton-proton ($pp$) and proton-antiproton ($p\bar p$) differential cross section data in a statistically not excludible way, i.e., with a confidence level greater than 0.1% in the center of mass energy range 546 GeV $\leq\sqrt{s}\leq 8$ TeV and in the squared four-momentum transfer range 0.37 GeV$^2$ $\leq -t\leq1.2$...

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  68. 67. Measurement and QCD analysis of inclusive jet production in deep inelastic scattering at HERA
    Katarzyna Wichmann (Deutsches Elektronen-Synchrotron (DE))

    A new measurement of inclusive jet cross sections in neutral current deep inelastic scattering using the ZEUS detector at the HERA collider is presented. The data were taken at HERA in the years 2004 to 2007 at a centre-of-mass energy of 318 GeV and correspond to an integrated luminosity of 347 pb-1. Massless jets, reconstructed using the kT-algorithm in the Breit reference frame, have been...

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  69. 68. Measurement of the azimuthal decorrelation angle between the leading jet and the scattered lepton in deep inelastic scattering at HERA
    Katarzyna Wichmann (Deutsches Elektronen-Synchrotron (DE))

    The azimuthal decorrelation angle ∆φ between the leading jet and scattered lepton in deep inelastic scattering has been measured with the ZEUS detector at HERA.The experimental data set was taken in the HERA II data-taking period and corresponds to an integrated luminosity of 326 pb-1. The measurement was performed within a range of the exchanged photon virtuality Q2 from 10 to 350 GeV2, the...

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  70. 132. Measurement of the azimuthal decorrelation angle between the leading jet and the scattered lepton in deep inelastic scattering at HERA
    Prof. Bernd Surrow (Temple University)
  71. 76. Next-to-leading order photon+jet production
    Yair Mulian

    Using the CGC effective theory together with the hybrid factorisation, we study forward photon+jet production in proton-nucleus collisions beyond leading order. We first compute the "real" next-to-leading order (NLO) corrections, i.e. the radiative corrections associated with a three-parton final state, out of which only two are being measured. Then we move to the "virtual" NLO corrections to...

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  72. 126. On color reconnection effects in J/psi hadroproduction
    Leszek Motyka
  73. 75. On the exact solution for the Schrödinger equation
    Yair Mulian

    For almost a century, the general solution for the Schrödinger equation was assumed to be generated by a time-ordered exponential known as the Dyson series. We discuss under which conditions the unitarity of this solution is broken, and additional discrete dynamics emerges. Then, we provide an alternative construction that is manifestly unitary, regardless of the Hamiltonian and the setup. The...

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  74. 84. Physics with proton/neutron tagging in pp, pO collisions at the LHC.
    Michael Pitt (The University of Kansas (US))

    The talk will cover several research opportunities with tagged forward protons/neutrons using the proton-proton and proton-Oxygen collisions at the Large Hadron Collider.

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  75. 73. Precision measurements of W production at ATLAS
    ATLAS Collaboration

    The indirect determination of the W-boson mass from global electroweak fits outperforms the precision of its experimentally measured value. An improved experimental measurement is therefore one of the goals of the LHC physics program. The talk will present a re-analysis of the mass of the W boson at a centre-of-mass energy of 7 TeV using a profile likelihood fit, which improves the precision...

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  76. 74. Precision measurements of Z production at ATLAS
    ATLAS Collaboration

    Precision measurements of the production cross-sections of Z bosons at LHC provide important tests of perturbative QCD and constrain the parton distribution functions for quarks within the proton. This talk will present an extraordinarily precise double-differential measurement of the Z boson in the full phase space of the decay leptons at a centre-of-mass energy of 8 TeV. The recoil of the...

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  77. 77. QCD corrections to quarkonium production
    Jean-Philippe Lansberg (Université Paris-Saclay (FR))

    I will review the impact of QCD corrections to quarkonium production in inclusive and exclusive reactions. First, I will explain how they significantly alter the cross section at mid and large $p_T$ in inclusive photo- and hadro-production. Second, I will discuss the perturbative instability arising at high energies in $p_T$-integrated fixed-order computations and discuss how they can be...

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  78. 128. QCD corrections to quarkonium production
    Jean-Philippe Lansberg (IPN Orsay, Paris Saclay U. / IN2P3-CNRS), Jean-Philippe Lansberg (Ecole polytechnique), Jean-Philippe Lansberg (Université Paris-Saclay (FR))
  79. 66. Search for effective Lorentz and CPT violation using ZEUS data
    Katarzyna Wichmann (Deutsches Elektronen-Synchrotron (DE))

    Lorentz and CPT symmetry in the quark sector of the Standard Model are studied in the context of an effective field theory using ZEUS e±p data. Symmetry-violating effects can lead to time-dependent oscillations of otherwise time-independent observables, including scattering cross sections. An analysis using five years of inclusive neutral-current deep inelastic scattering events corresponding...

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  80. 125. tba
    Carlos Ricardo Contreras Correa (Departamento de Fisica-Univ. Tecnica Federico Santa Maria (UTFS)
  81. 69. The LHCspin project
    Marco Santimaria (INFN e Laboratori Nazionali di Frascati (IT))

    The goal of LHCspin is to develop, in the next few years, innovative solutions and cutting-edge technologies to access spin physics in high-energy polarized fixed-target collisions, by exploring a unique kinematic regime given by the LHC beam and by exploiting new probes.
    This ambitious task poses its basis on the recent installation of SMOG2, the unpolarized gas target in front of the LHCb...

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  82. 83. Transverse analyzing power measurement in the high energy forward $p^{\uparrow}p$ and $p^{\uparrow}A$ scattering at RHIC hydrogen jet target polarimeter
    Andrei Poblaguev (Brookhaven National Laboratory)

    The Polarized Hydrogen Gas Jet Target Polarimeter (HJET) at the Relativistic Heavy-Ion Collider (RHIC) is utilized to accurately measure the vertical polarization of proton beams with low systematic uncertainties of approximately $\sigma^\text{syst}_P/P\le0.5\%$. These measurements are conducted in the CNI region, $0.0013<|t|<0.017~\rm{GeV}^2$. By measuring the elastic single $A_\text{N}(t)$...

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