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1.
Measurement of the cross-section ratio σ$_{ψ(2S)}$/σ$_{J/ψ(1S)}$ in exclusive photoproduction at HERA / ZEUS Collaboration
The exclusive photoproduction reactions $\gamma p \to J/\psi(1S) p$ and $\gamma p \to \psi(2S) p$ have been measured at an $ep$ centre-of-mass energy of 318 GeV with the ZEUS detector at HERA using an integrated luminosity of 373 pb$^{-1}$. The measurement was made in the kinematic range $30 < W < 180$ GeV, $Q^2 < 1$ GeV$^2$ and $|t| < 1$ GeV$^2$, where $W$ is the photon--proton centre-of-mass energy, $Q^2$ is the photon virtuality and $t$ is the squared four-momentum transfer at the proton vertex. [...]
arXiv:2206.13343; DESY-22-107.- 2022-12-29 - 27 p. - Published in : JHEP 2212 (2022) 164 Fulltext: document - PDF; 2206.13343 - PDF;
2.
Azimuthal correlations in photoproduction and deep inelastic $ep$ scattering at HERA / ZEUS Collaboration
Collective behaviour of final-state hadrons, and multiparton interactions are studied in high-multiplicity $ep$ scattering at a centre-of-mass energy $\sqrt{s}=318$ GeV with the ZEUS detector at HERA. Two- and four-particle azimuthal correlations, as well as multiplicity, transverse momentum, and pseudorapidity distributions for charged-particle multiplicities $N_{\textrm ch} \geq 20$ are measured. [...]
arXiv:2106.12377; DESY-21-099.- 2021-12-16 - 27 p. - Published in : JHEP 2112 (2021) 102 Fulltext: document - PDF; 2106.12377 - PDF;
3.
Impact of jet-production data on the next-to-next-to-leading-order determination of HERAPDF2.0 parton distributions / H1 Collaboration
The HERAPDF2.0 ensemble of parton distribution functions (PDFs) was introduced in 2015. The final stage is presented, a next-to-next-to-leading-order (NNLO) analysis of the HERA data on inclusive deep inelastic $ep$ scattering together with jet data as published by the H1 and ZEUS collaborations. [...]
arXiv:2112.01120; DESY-21-206.- 2022-03-21 - 43 p. - Published in : Eur. Phys. J. C 82 (2022) 243 Fulltext: 2112.01120 - PDF; document - PDF;
4.
Exploring SMEFT couplings using the forward–backward asymmetry in neutral current Drell–Yan production at the LHC / Abdolmaleki, Hamed (IPM, Tehran ; Lorestan U.) ; Amoroso, Simone (DESY) ; Britzger, Daniel (Munich, Max Planck Inst.) ; Dattola, Filippo (DESY) ; Fiaschi, Juri (INFN, Milan Bicocca ; Milan Bicocca U.) ; Giuli, Francesco (CERN) ; Glazov, Alexander (DESY) ; Hautmann, Francesco (CERN ; Antwerp U. ; Oxford U.) ; Luszczak, Agnieszka (Cracow Tech. U.) ; Taheri Monfared, Sara (DESY) et al.
Neutral current Drell-Yan (DY) lepton-pair production is considered in the framework of the Standard Model Effective Field Theory (SMEFT). Using the open-source fit platform xFitter, we investigate the impact of high-statistics measurements of the neutral current DY (NCDY) forward-backward asymmetry $A_{\rm{FB}}$ near the weak boson mass scale in the present and forthcoming stages of the Large Hadron Collider (LHC). [...]
arXiv:2310.19638; DESY-23-160.- 2024-12-09 - 22 p. - Published in : Eur. Phys. J. C 84 (2024) 1277 Fulltext: 2310.19638 - PDF; document - PDF;
5.
Measurement of groomed event shape observables in deep-inelastic electron-proton scattering at HERA / H1 Collaboration
The H1 Collaboration at HERA reports the first measurement of groomed event shape observables in deep inelastic electron-proton scattering (DIS) at $\sqrt{s}=319$ GeV, using data recorded between the years 2003 and 2007 with an integrated luminosity of $351$ pb$^{-1}$. Event shapes provide incisive probes of perturbative and non-perturbative QCD. [...]
arXiv:2403.10134; DESY-24-036.- 2024-07-22 - 32 p. - Published in : Eur. Phys. J. C 84 (2024) 718 Fulltext: document - PDF; 2403.10134 - PDF;
6.
Combination of Differential D^{*\pm} Cross-Section Measurements in Deep-Inelastic ep Scattering at HERA / Abramowicz, H. (Tel Aviv U. ; Munich, Max Planck Inst.) ; Abt, I. (Munich, Max Planck Inst.) ; Adamczyk, L. (AGH-UST, Cracow) ; Adamus, M. (NCBJ, Swierk) ; Andreev, V. (Lebedev Inst.) ; Antonelli, S. (INFN, Bologna) ; Aushev, V. (Kiev, INR ; Taras Shevchenko U.) ; Aushev, Y. (Taras Shevchenko U. ; Kiev Polytechnic Inst.) ; Baghdasaryan, A. (Yerevan Phys. Inst.) ; Begzsuren, K. (Ulan Bator, Inst. Phys. Tech.) et al. /H1 Collaoration ; ZEUS Collaborations
H1 and ZEUS have published single-differential cross sections for inclusive D^{*\pm}-meson production in deep-inelastic ep scattering at HERA from their respective final data sets. These cross sections are combined in the common visible phase-space region of photon virtuality Q2 > 5 GeV2, electron inelasticity 0.02 < y < 0.7 and the D^{*\pm} meson's transverse momentum pT (D^*) > 1.5 GeV and pseudorapidity |eta(D^*)| < 1.5. [...]
arXiv:1503.06042; DESY-15-037; DESY-15-037.- 2015-09-22 - 37 p. - Published in : JHEP 09 (2015) 149 Article from SCOAP3: PDF; Fulltext: jt - PDF; arXiv:1503.06042 - PDF; Springer Open Access article: PDF; External links: Rivet analyses reference; Fermilab Library Server
7.
Search for a narrow baryonic state decaying to ${pK^0_S}$ and ${\overline{p}K^0_S}$ in deep inelastic scattering at HERA / ZEUS Collaboration
A search for a narrow baryonic state in the $pK^0_S$ and $\overline{p}K^0_S$ system has been performed in $ep$ collisions at HERA with the ZEUS detector using an integrated luminosity of 358 pb$^{-1}$ taken in 2003-2007. The search was performed with deep inelastic scattering events at an $ep$ centre-of-mass energy of 318 GeV for exchanged photon virtuality, $Q^2$, between 20 and 100 $\rm{} GeV^{2}$. [...]
DESY-16-065; arXiv:1604.02220; DESY-16-065.- 2016-08-10 - 8 p. - Published in : Phys. Lett. B 759 (2016) 446-453 Article from SCOAP3: PDF; Preprint: PDF; External link: Preprint
8.
Limits on the effective quark radius from inclusive $ep$ scattering at HERA / ZEUS Collaboration
The high-precision HERA data allows searches up to TeV scales for Beyond the Standard Model contributions to electron-quark scattering. Combined measurements of the inclusive deep inelastic cross sections in neutral and charged current $ep$ scattering corresponding to a luminosity of around 1 fb$^{-1}$ have been used in this analysis. [...]
DESY-16-035; arXiv:1604.01280.- 2016-06-10 - 5 p. - Published in : Phys. Lett. B 757 (2016) 468-472 Article from SCOAP3: PDF; Preprint: PDF; External link: Preprint
9.
Observation and differential cross section measurement of neutral current DIS events with an empty hemisphere in the Breit frame / H1 Collaboration
The Breit frame provides a natural frame to analyze lepton-proton scattering events. In this reference frame, the parton model hard interactions between a quark and an exchanged boson defines the coordinate system such that the struck quark is back-scattered along the virtual photon momentum direction. [...]
arXiv:2403.08982; DESY-24-034.- 2024-07-22 - 13 p. - Published in : Eur. Phys. J. C 84 (2024) 720 Fulltext: document - PDF; 2403.08982 - PDF;
10.
Measurement of the 1-jettiness event shape observable in deep-inelastic electron-proton scattering at HERA / H1 Collaboration
The H1 Collaboration reports the first measurement of the 1-jettiness event shape observable $\tau_1^b$ in neutral-current deep-inelastic electron-proton scattering (DIS). The observable $\tau_1^b$ is equivalent to a thrust observable defined in the Breit frame. [...]
arXiv:2403.10109; DESY-24-035.- 2024-08-07 - 42 p. - Published in : Eur. Phys. J. C 84 (2024) 785 Fulltext: document - PDF; 2403.10109 - PDF;

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