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Low-x 2021

26 September 2021 to 1 October 2021
Europe/Rome timezone

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Contribution List

101 out of 101 displayed
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  1. 14. Welcome
    Angelo Scribano Memoria (Universita & INFN Pisa (IT)), Christophe Royon (The University of Kansas (US))
    27/09/2021, 14:00
  2. 17. From small to large x: toward a unified formalism for particle production in high energy collisions
    Jamal Jalilian-Marian (Baruch College)
    27/09/2021, 14:10
  3. 15. Recent results on PDFs and alpha_s from HERA (remote)
    Amanda Sarkar (University of Oxford (GB)), amanda sarkar
    27/09/2021, 14:30
  4. 16. Parton distribution functions and intrinsic charm at LHCb
    Cristina Sánchez Gras (Nikhef National institute for subatomic physics (NL))
    27/09/2021, 14:55
  5. 18. Precision QCD measurements from CMS
    Toni Makela (Deutsches Elektronen-Synchrotron (DE))
    27/09/2021, 15:20
  6. 78. Direct measurement of short-lived particle dipole moments at the LHC
    Nicola Neri (Università degli Studi e INFN Milano (IT))
    27/09/2021, 16:10
  7. 76. J\psi polarization in high multiplicity hadronic collisions
    Tomasz Stebel (Institute of Theoretical Physics Jagiellonian University), Tomasz Stebel (CERN)
    27/09/2021, 16:30
  8. 20. Determination of proton parton distribution functions using ATLAS data
    Zhiqing Philippe Zhang (IJCLab, Orsay (FR))
    27/09/2021, 16:50
  9. 101. Speeding up machine learning-based inference for Hadronic physics via Hadamard matrices
    Thomas Chen (Academy for Mathematics, Science, and Engineering)
    27/09/2021, 17:15
  10. 19. The Diffractive Contribution to Deep Inelastic Lepton-Proton Scattering: Implications for QCD Momentum Sum Rules and Parton Distributions
    Stanley J. Brodsky (SLAC National Accelerator Laboratory, Stanford University)
    27/09/2021, 17:35
  11. 22. Discussion session: PDFs, QCD
    Cyrille Marquet (CPHT - Ecole Polytechnique), Dimitri Colferai (University of Florence), Krzysztof Kutak (Instytut Fizyki Jadrowej Polskiej Akademii Nauk)
    27/09/2021, 18:00
  12. 23. Search for BFKL signatures in CMS (remote)
    Salim Cerci (Adiyaman University (TR) - Istanbul University (TR))
    28/09/2021, 09:00
  13. 33. RFT and Self-duality
    Michael Lublinsky (Ben-Gurion University of the Negev (IL))
    28/09/2021, 09:25
  14. 25. Two-particle correlations in multi-Regge kinematics (remote)
    Grigorios Chachamis (LIP, Lisbon)
    28/09/2021, 09:45
  15. 26. Mueller-Tang jets with Next-to-Leading Order Impact Factors
    Federico Deganutti
    28/09/2021, 10:05
  16. 27. Is BFKL factorization valid for Mueller-Tang jets?
    Dimitri Colferai (University of Florence)
    28/09/2021, 10:25
  17. 28. Black disk radius constraint from a gray disc model description of the pp cross-section
    Irais Bautista Guzman (Centro de Investigación y de Estudios Avanzados del IPN (MX))
    28/09/2021, 11:10
  18. 29. Phenomenology of the hadronic structure at low-x (remote)
    Francesco Giovanni Celiberto (Università della Calabria and INFN Cosenza (Italy)), Francesco Giovanni Celiberto (ECT*/FBK Trento & INFN-TIFPA)
    28/09/2021, 11:30
  19. 30. Twist analysis of the Balitsky-Kovchegov equation
    Leszek Motyka
    28/09/2021, 11:50
  20. 31. LHCf experiment: current status and future prospect (remote)
    Yoshitaka Itow
    28/09/2021, 12:10
  21. 32. Discussion session: low x, BFKL
    Cyrille Marquet (CPHT - Ecole Polytechnique), Dimitri Colferai (University of Florence), Krzysztof Kutak (Instytut Fizyki Jadrowej Polskiej Akademii Nauk)
    28/09/2021, 12:35
  22. 34. On transverse gluon polarization at small x
    Cyrille Marquet (CPHT - Ecole Polytechnique)
    28/09/2021, 14:30
  23. 35. Forward dijets in proton-nucleus collisions at next-to-leading order
    Yair Mulian
    28/09/2021, 14:50
  24. 75. Forward hadronization and the muon puzzle in air showers
    Tanguy Pierog (KIT)
    28/09/2021, 15:10
  25. 39. Medium induced cascades and transverse momentum dependence of gluon distribution
    Krzysztof Kutak (Instytut Fizyki Jadrowej Polskiej Akademii Nauk)
    28/09/2021, 15:35
  26. 24. Phenomenology studies of Mueller-Tang and Mueller-Navelet jets (remote)
    Cristian Baldenegro Barrera (The University of Kansas (US))
    28/09/2021, 15:55
  27. 40. The LHC Spin project
    Marco Santimaria (INFN e Laboratori Nazionali di Frascati (IT)), Marco Santimaria
    28/09/2021, 16:40
  28. 72. Jet cross section measurements in CMS (remote)
    Deniz Sunar Cerci (Adiyaman University (TR) - Istanbul University (TR))
    28/09/2021, 17:05
  29. 73. Precision measurements of jet production at the ATLAS experiment (remote)
    Francesco Giuli (INFN e Universita Roma Tor Vergata (IT))
    28/09/2021, 17:30
  30. 38. New results on probing limitations of collinear QCD in lepton-jet correlations (remote)
    Ben Nachman (Lawrence Berkeley National Lab. (US))
    28/09/2021, 17:55
  31. 41. Discussion session: low x, BFKL, jets
    Cyrille Marquet (CPHT - Ecole Polytechnique), Dimitri Colferai (University of Florence), Krzysztof Kutak (Instytut Fizyki Jadrowej Polskiej Akademii Nauk)
    28/09/2021, 18:20
  32. 42. TOTEM results
    Frigyes Janos Nemes (CERN (also at Wigner RCP Budapest, Hungary))
    29/09/2021, 09:00
  33. 43. The discovery of the odderon by the D0 and TOTEM collaborations (remote)
    Carlos Arturo Avila Bernal (Universidad de los Andes), Carlos Avila Bernal (Universidad de los Andes (CO))
    29/09/2021, 09:20
  34. 45. Properties of the Odderon extracted from a meta-analysis of experimental data
    Tamas Csorgo (Wigner Research Centre for Physics (Wigner RCP) (HU))
    29/09/2021, 09:40
  35. 44. Odderon: Lost or Found? (remote)
    Vladimir Petrov (Institute for High Energy Physics of NRC Kurchatov Institute (R), Vladimir Petrov, Vladimir Petrov (Joint Institute for Nuclear Research (JINR)), Vladimir Petrov
    29/09/2021, 10:00
  36. 46. Observation of Odderon Effects at LHC energies - A Real Extended Bialas-Bzdak Model Study
    Istvan Szanyi (Hungarian Academy of Sciences (HU)), István Szanyi (Eötvös Loránd University)
    29/09/2021, 10:20
  37. 93. Summary of the odderon discovery (remote)
    Kenneth Osterberg (University of Helsinki), Kenneth Osterberg (Helsinki Institute of Physics (FI))
    29/09/2021, 10:40
  38. 74. Elastic photon-initiated production at the LHC: the role of hadron-hadron interactions (remote)
    Lucian Harland-Lang (University of Oxford)
    29/09/2021, 11:20
  39. 48. FACET: a very forward multiparticle spectrometer from CMS
    Michael Albrow (Fermi National Accelerator Lab. (US))
    29/09/2021, 11:40
  40. 49. On holographics derivation of basic properties of QCD glueballs (remote)
    Dmitry Melnikov (Rutgers University)
    29/09/2021, 12:00
  41. 50. From soft to hard diffraction in ultraperipheral collisions at the LHC
    Mark Strikman, Mark Strikman (Penn State University), Mark Strikman (Pennsylvania State University (US))
    29/09/2021, 12:20
  42. 51. Discussion session: odderon and soft physics
    Christophe Royon (The University of Kansas (US)), Kenneth Osterberg (University of Helsinki), Kenneth Osterberg (Helsinki Institute of Physics (FI))
    29/09/2021, 12:40
  43. 63. Collectivity in heavy ion interactions at CMS
    Georgios Krintiras (The University of Kansas (US))
    30/09/2021, 09:00
  44. 64. Light hadron and photon production in pPb collisions at LHCb (remote)
    Thomas Boettcher (University of Cincinnati (US)), Thomas Julian Boettcher (University of Michigan (US))
    30/09/2021, 09:25
  45. 65. Probing initial state with photons and neutral mesons in ALICE
    Jens Robert Luhder (Westfaelische Wilhelms-Universitaet Muenster (DE))
    30/09/2021, 09:50
  46. 66. Top results in heavy ions in CMS
    Luis Alcerro Alcerro (The University of Kansas (US))
    30/09/2021, 10:15
  47. 70. Charmonia photo-production in ultra-peripheral and peripheral PbPb collisions with LHCb (remote)
    Weisong Duan (South China Normal University (CN)), Weisong Duan (South China Normal University)
    30/09/2021, 11:00
  48. 67. Measurement of W and Z boson production in association with jets at ATLAS
    Laura Fabbri (Universita e INFN, Bologna (IT))
    30/09/2021, 11:25
  49. 68. V+jets results from CMS
    Vieri Candelise (Universita di Roma I "La Sapienza"-Universita & INFN, Roma I), Vieri Candelise (Universita e INFN Trieste (IT))
    30/09/2021, 11:50
  50. 69. Vector-boson scattering, diboson and triboson production at ATLAS
    Despoina Sampsonidou (Tsung-Dao Lee Institute (CN) & Shanghai Jiao Tong Univ. (CN))
    30/09/2021, 12:15
  51. 71. Discussion: heavy ions, vector bosons
    Georgios Krintiras (The University of Kansas (US)), Irais Bautista Guzman (Centro de Investigación y de Estudios Avanzados del IPN (MX))
    30/09/2021, 12:40
  52. 53. The CMS Precision Proton Spectrometer Project for the HL-LHC
    Mario Deile (CERN), Mario Deile (CERN)
    30/09/2021, 14:30
  53. 54. Overview of ATLAS forward proton detectors for LHC Run 3 and plans for the HL-LHC (remote)
    Maciej Piotr Lewicki (Polish Academy of Sciences (PL))
    30/09/2021, 14:55
  54. 55. Anomalous coupling studies with intact protons
    Christophe Royon (The University of Kansas (US))
    30/09/2021, 15:20
  55. 56. Study of anomalous exclusive t tbar protduction at the LHC
    Andrea Bellora (Universita e INFN Torino (IT))
    30/09/2021, 15:40
  56. 52. Diffractive results from CMS and TOTEM (remote)
    Cristian Baldenegro Barrera (The University of Kansas (US))
    30/09/2021, 16:00
  57. 57. Inclusive diffractive production of top quark(s)
    Michael Pitt (CERN)
    30/09/2021, 16:25
  58. 58. The Precision Proton Spectrometer of CMS: performance and prospects
    Ada Solano (Universita' di Torino e INFN (IT))
    30/09/2021, 17:10
  59. 59. Photon induced processes results from CMS
    Beatriz Ribeiro Lopes (Deutsches Elektronen-Synchrotron (DE))
    30/09/2021, 17:35
  60. 60. Photon-photon fusion measurements at ATLAS
    Krzysztof Cieśla (Polish Academy of Sciences (PL))
    30/09/2021, 18:00
  61. 61. Hard Diffraction at the LHC - Feasibility Studies and Experimental Aspects
    Maciej Trzebinski (Polish Academy of Sciences (PL))
    30/09/2021, 18:25
  62. 62. Discussion session: inclusive and exclusive diffraction
    Leszek Motyka, Mario Deile (CERN), Michael Albrow (Fermi National Accelerator Lab. (US)), Valentina Avati (AGH University of Science and Technology (PL))
    30/09/2021, 18:45
  63. 79. Measurements of prompt photon production with the ATLAS detector
    Daniel Camarero Munoz (Universidad Autonoma de Madrid (ES))
    01/10/2021, 09:00
  64. 81. Recent results on vector meson production, particle multiplicity spectra and particle correlations at HERA
    Marta Ruspa (Universita e INFN Torino (IT))
    01/10/2021, 09:25
  65. 82. Recent ALICE results on vector meson photoproduction
    Simone Ragoni (University of Birmingham (GB))
    01/10/2021, 09:50
  66. 83. Gluon-gluon fusion for production of light isoscalar mesons (remote)
    Antoni Szczurek (Institute of Nuclear Physics)
    01/10/2021, 10:15
  67. 47. Single and double phi production at the LHC: the role of odderon exchange (remote)
    Piotr Lebiedowicz (Institute of Nuclear Physics PAN)
    01/10/2021, 10:35
  68. 86. Semiexclusive dilepton production in proton-proton collisions with one forward proton measurement at the LHC (remote)
    Barbara Linek, Marta Luszczak (University of Rzeszow)
    01/10/2021, 11:20
  69. 87. Inclusive Higgs-Jet production in high-energy hadron collisions (remote)
    Mohammed Maher Abdelrahim Mohammed (University of Calabria and INFN - Gruppo collegato di Cosenza)
    01/10/2021, 11:40
  70. 88. Rho photoproduction in ALICE (remote)
    Spencer Robert Klein (Lawrence Berkeley National Lab. (US))
    01/10/2021, 12:00
  71. 89. Discussion: Vector mesons
    Georgios Krintiras (The University of Kansas (US)), Irais Bautista Guzman (Centro de Investigación y de Estudios Avanzados del IPN (MX))
    01/10/2021, 12:25
  72. 90. Workshop Conclusion
    Angelo Scribano Memoria (Universita & INFN Pisa (IT)), Christophe Royon (The University of Kansas (US))
    01/10/2021, 12:55
  73. 21. A model description of spin-averaged and spin-dependent structure functions F (remote)
    Barbara Badelek (University of Warsaw (PL))
  74. 77. ATLAS results on charmonium production
  75. 94. Black disk radius constraint from a gray disk model description of the pp cross-section
    Irais Bautista Guzman (Centro de Investigación y de Estudios Avanzados del IPN (MX))

    We use a two-function interplay model parametrization to describe data of the pp cross-section by the increase of matter density to the black disk saturation limit and the radial expansion through the growth of the overlap area based on a geometric scaling model. We argue two mechanisms responsible for the growth of high energy cross-sections in pp collisions by using data on different species...

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  76. 12. Charmonia photo-production in ultra-peripheral and peripheral PbPb collisions with LHCb
    Sebastian Neubert (University of Bonn (DE))

    In 2018, LHCb recorded $\sim 210 \mu b^{-1}$ integrated luminosity of PbPb
    collisions at $\sqrt{s_{NN}}$ = 5.02 TeV. With an increase of the luminosity by a
    factor 20 compared to the previous 2015 PbPb dataset, precise measurements on
    photo-produced charmonia in ultra-peripheral collisions are foreseen. Moreover,
    the great momentum resolution of the detector allows to study...

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  77. 91. Direct measurement of short-lived particle dipole moments at the LHC
    Nicola Neri (Università degli Studi e INFN Milano (IT))

    Magnetic and electric dipole moments of fundamental particles provide powerful probes for physics within and beyond the Standard Model. For the case of short-lived particles these have not been experimentally accessible to date due to the difficulties imposed by their short lifetimes. A unique program of direct measurements of electromagnetic dipole moments of strange and charm baryons, and...

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  78. 80. Discussion session: jets, final state, quarkonia
  79. 95. Elastic photon-initiated production at the LHC: the role of hadron-hadron interactions
    Dr Lucian Harland-Lang (University of Oxford)

    We discuss the role of additional hadron-hadron interactions in elastic photon-initiated production at the LHC, both in proton and heavy ion collisions. We in particular assess different sources of uncertainty associated with these cross sections, and compare with other calculations in the literature. A key result of our analysis is that the uncertainty associated with the survival factor is...

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  80. 36. Fixed multiplicity studies at the LHC
    Agustin Sabio Vera, Agustin Sabio Vera
  81. 8. Forward dijets in proton-nucleus collisions at next-to-leading order
    Yair Mulian

    Using the CGC effective theory together with the hybrid factorisation, we study forward dijet production in proton-nucleus collisions beyond leading order. In this paper, we 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. To that aim, we start by revisiting our...

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  82. 98. From soft to hard diffraction in ultraperipheral collisions at tLHC
    Prof. Mark Strikman (Penn State University)

    We review a number of coherent phenomena which are studied in the ultraperipheral collisions (UPC) at the LHC. In particular, we demonstrate that much larger shadowing for coherent rho-meson production than in the Glauber model naturally emerges in the color fluctuation picture of high energy hadron – nucleon interaction. We also demonstrate that the theory of the leading twist gluon...

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  83. 13. Hard Diffraction at the LHC - Feasibility Studies and Experimental Aspects
    Maciej Trzebinski (Polish Academy of Sciences (PL))

    Diffractive processes possible to be measured at the LHC will be briefly discussed. This includes soft (elastic scattering, exclusive meson pair production, diffractive bremsstrahlung) and hard (single and double Pomeron exchange jets, γ+jet, W/Z, jet-gap-jet, exclusive jets) processes as well as Beyond Standard Model phenomena (anomalous gauge couplings, magnetic monopoles).

    Feasibility...

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  84. 99. Inclusive Higgs-Jet production in high-energy hadron collisions
    Mohammed Maher Abdelrahim Mohammed (Università della Calabria & INFN-Cosenza)

    We present recent BFKL phenomenological results for the inclusive production of a Higgs in association with a jet, as a testfield for the semi-hard regime of QCD. We show how the large energy scales provided by the emission of a Higgs boson stabilize the BFKL series, and discuss the possible extension of this work in the full NLA BFKL analysis, by including the NLO jet impact factor, with a...

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  85. 1. J\psi polarization in high multiplicity hadronic collisions
    Tomasz Stebel (Jagiellonian University)

    High multiplicity events in small collision systems ($pp$ and $pA$ collisions) at hadron colliders have received much attention in recent years. In this talk we will present analysis of $J/\psi$ polarization in high multiplicity hadron collisions using the CGC+NRQCD framework. Predictions both for $pp$ and $pA$ at LHC energies will be presented.

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  86. 5. Jet-based TMD measurements with H1 data, unfolded using machine-learning techniques
    Collaboration H1 (DESY)

    Recently, jet measurements in DIS events close to Born kinematics have been proposed as a new probe to study transverse-momentum-dependent (TMD) PDFs, TMD fragmentation functions, and TMD evolution. We report measurements of lepton-jet momentum imbalance and hadron-in-jet correlations in high-$Q62$ DIS events collected with the H1 detector at HERA. The jets are reconstructed with the kT...

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  87. 7. Measurement of 1-jettiness in deep-inelastic scattering at HERA
    Collaboration H1 (DESY)

    A first measurement of the 1-jettiness event shape observable in neutral-current deep-inelastic electron-proton scattering is presented. The 1-jettiness observable $\tau_{1b}$ is defined such that it is equivalent to the thrust observable in the Breit frame, following momentum conservation. The data were taken with the H1 detector at the HERA $ep$ collider at a center-of-mass energy of 319 GeV...

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  88. 3. Measurement of charged particle multiplicity distributions in DIS at HERA and its implication to entanglement entropy of partons
    Collaboration H1 (DESY)

    Charged particle multiplicity distributions in positron-proton deep inelastic scattering at a centre-of-mass energy $\sqrt{s}=319$ GeV are measured. The data are collected with the H1 detector at HERA corresponding to an integrated luminosity of 136 pb$^{−1}$. Charged particle multiplicities are measured as a function of photon virtuality $Q^2$, inelasticity $y$ and pseudorapidity $\eta$ in...

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  89. 4. Measurement of Exclusive pi+pi- and rho0 Meson Photoproduction at HERA
    Collaboration H1 (DESY)

    Exclusive photoproduction of $\rho^0(770)$ mesons is studied using the H1 detector at the $ep$ collider HERA. A sample of about 900000 events is used to measure single- and double-differential cross sections for the reaction $\gamma p\to \pi^{+}\pi^{-}Y$. Reactions where the proton stays intact ($m_Y=m_p$) are statistically separated from those where the proton dissociates to a low-mass...

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  90. 11. Medium induced cascades and transverse momentum dependence of gluon distribution
    Krzysztof Kutak (Instytut Fizyki Jadrowej Polskiej Akademii Nauk)

    I would like to present recently obtained results for distribution of soft gluons that are produced by hard jet propagating through quark gluon plasma.
    The results are based on the papers:
    https://link.springer.com/article/10.1007/JHEP04(2021)014
    https://journals.aps.org/prc/abstract/10.1103/PhysRevC.102.044910

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  91. 96. Mueller-Tang jets with Next-toLeading Order Impact Factors
    Federico Deganutti

    We present, the results of a phenomenology analysis at Next-to-Leading accuracy for the Mueller-Tang jet process, where two jets separated by a large rapidity interval and no other radiation are observed. This process is of high interest, as one might be able to investigate Balitsky-Fadin-Kuraev-Lipatov (BFKL) dynamics which emerges in the high-energy limit of quantum chromodynamics...

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  92. 84. Open slot
  93. 10. Parton distribution functions and intrinsic charm at LHCb
    LHCb Collaboration

    LHCb is a spectrometer that covers the forward region of proton-proton collisions, in the pseudo-rapidity range from 2 to 5. At LHCb, proton Parton Distribution Functions (PDFs) can be studied in a unique phase space complementary to that accessible by ATLAS and CMS, corresponding to low and high Bjorken-x. In this talk, the measurements of vector boson production in the forward region, with...

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  94. 97. Precision QCD measurements from CMS
    Toni Makela (Deutsches Elektronen-Synchrotron (DE))

    Jet production is an important probe of both QCD and new physics. Recent CMS measurements involving jet production are presented. In particular, the CMS 13 TeV inclusive jet data are used in a QCD analysis together with HERA inclusive deep inelastic scattering and CMS 13 TeV triple-differential top quark-antiquark pair production cross sections. The parton distributions and the strong coupling...

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  95. 9. Recent ALICE results on vector meson photoproduction
    Simone Ragoni (University of Birmingham (GB))

    Simone Ragoni$^1$, on behalf of the ALICE Collaboration

    $^1$ University of Birmingham, Birmingham, B15 2TT, UK
    simone.ragoni@cern.ch

    Ultra-peripheral collisions (UPC) are events characterised by large impact parameters between the two projectiles, larger than the sum of their radii. As a consequence, the protons and ions accelerated by the LHC are beyond the reach of the strong...

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  96. 6. Search for collectivity in ep collisions at HERA with the H1 experiment
    Collaboration H1 (DESY)

    Measurements of two- and multi-particle angular correlations in DIS and photoproduction ep collisions at $\sqrt{s}=319$ GeV are presented as a function of charged particle multiplicity. The data were collected using the H1 detector at HERA. Since no long-range ridge structure is observed in the correlation functions over the full multiplicity range, upper limits of ridge yield are provided as...

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  97. 100. Speeding up machine learning-based inference for Hadronic physics via Hadamard matrices
    Thomas Chen (Academy for Mathematics, Science, and Engineering)

    Recent research by CERN has revealed machine learning-driven capabilities for the identification of proton-proton collisions at LHC for reanalysis. While this work and other previous works also work on speeding up inference via the machine learning algorithm, in this work we propose harnessing Hadamard matrices for faster inference at the model level. Machine learning algorithms for...

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  98. 85. tba
    Ronan Mcnulty (University College Dublin (IE))
  99. 2. The LHCspin project
    Pasquale Di Nezza (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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  100. 92. Twist analysis of the Balitsky-Kovchegov equation
    Leszek Motyka

    We perform a twist decomposition of the proton structure functions that evolve according to the Balitsky-Kovchegov equation at the LL order. Using the Mellin space technique we isolate the linear (BFKL) effects and the non-linear (BK) corrections for the leading and subleading twist contributions.

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  101. 37. Unitarization of the BFKL Pomeron states
    Jochen Bartels