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xFitter: An Open Source QCD Analysis Framework. A resource and reference document for the Snowmass study / xFitter Collaboration
We provide an overview of the xFitter open-source software package, review the general capabilities of the program, and highlight applications relevant to the Snowmass study. [...]
arXiv:2206.12465. - 20 p.
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Impact of low-$x$ resummation on QCD analysis of HERA data / xFitter Developers' Team Collaboration
Fits to the final combined HERA deep-inelastic scattering cross-section data within the conventional DGLAP framework of QCD have shown some tension at low $x$ and low $Q^2$. A resolution of this tension incorporating $\ln(1/x)$-resummation terms into the HERAPDF fits is investigated using the xFitter program. [...]
arXiv:1802.00064; DESY-18-017.- 2018-08-03 - 14 p. - Published in : Eur. Phys. J. C 78 (2018) 621 Article from SCOAP3: scoap3-fulltext - PDF; scoap - PDF; Fulltext: 1651789_arXiv:1802.00064 - PDF; arXiv:1802.00064 - PDF; 1802.00064 - PDF; External links: 00037 The up valence PDF $xu_v$, the gluon PDF $xg$ and the total singlet PDF $x\Sigma$ for the final fits with (NNLO+NLL$x$) and without (NNLO) $\ln(1/x)$ resummation.; 00027 The up valence PDF $xu_v$, the gluon PDF $xg$ and the total singlet PDF $x\Sigma$ for each of the 4 steps outlined in the text.; 00035 The up valence PDF $xu_v$, the gluon PDF $xg$ and the total singlet PDF $x\Sigma$ for each of the 4 steps outlined in the text.; 00033 The up valence PDF $xu_v$, the gluon PDF $xg$ and the total singlet PDF $x\Sigma$ for the final fits with (NNLO+NLL$x$) and without (NNLO) $\ln(1/x)$ resummation.; 00029 The HERA NC $E_p= 920$~GeV data compared to the fits with and without $\ln(1/x)$ resummation for the $Q^2 = 3.5$ and $4.5$~GeV$^2$ bins.; 00025 The HERA NC $E_p= 920$~GeV data compared to the fits with and without $\ln(1/x)$ resummation for the $Q^2 = 3.5$ and $4.5$~GeV$^2$ bins.; 00026 The charm PDF at $x=10^{-4}$ as a function of the factorisation scale $\mu$ for different values of the charm threshold $\mu_c = \kappa_c m_c$, with $\kappa_c=1.12,1.5,2,2.5$. The plots show the effect of the matching at NNLO (upper plot) and at NNLO+NLL$x$ (lower plot).; 00032 Scatter plot of the low-$x$ and low-$Q^2$ kinematic region covered by the HERA1+2 inclusive data and charm data at $E_p= 920$~GeV. The green shaded area indicates the region in which $\ln(1/x)$ resummation has a significant effect.; 00042 The resummed splitting functions at NNLO+NLL$x$ (solid) compared to fixed order at LO (dotted), NLO (dashed) and NNLO (dot-dot-dashed) for $P_{gg}$ (upper curves) and $P_{qg}$ (lower curves) as a function of $x$. The plots are at $\alpha_S=0.28$ (corresponding to $Q^2\sim 4$~GeV$^2$) and $n_f=4$.; 00036 The $\chi^2$/d.o.f. as a function of $Q^2_{\rm min}$ (left), $x_{\rm min}$ (center), and $y_{\rm max}$ (right). Each plot reports also the number of degrees of freedom at the extremities of each profile.; 00043 The $\chi^2$/d.o.f. as a function of $Q^2_{\rm min}$ (left), $x_{\rm min}$ (center), and $y_{\rm max}$ (right). Each plot reports also the number of degrees of freedom at the extremities of each profile.; 00031 The $\chi^2$/d.o.f. as a function of $Q^2_{\rm min}$ (left), $x_{\rm min}$ (center), and $y_{\rm max}$ (right). Each plot reports also the number of degrees of freedom at the extremities of each profile.

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Recent QCD results from the xFitter project: Probing the strange content of the proton with charm production in charged current at LHeC / xFitter Developers Team Collaboration
We investigate charm production in charged-current deep-inelastic scattering (DIS) using the xFitter program. xFitter is an open-source software framework for the determination of PDFs and the analysis of QCD physics, and has been used for a variety of LHC studies. [...]
arXiv:1909.00451.- SISSA, 2019-08-16 - 6 p. - Published in : PoS DIS2019 (2019) 025 Fulltext: 1909.00451 - PDF; PoS(DIS2019)025 - PDF;
In : The XXVII International Workshop on Deep Inelastic Scattering and Related Subjects, Turin, Italy, 8 - 12 Apr 2019, pp.025

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(65)

A determination of $m_c(m_c)$ from HERA data using a matched heavy-flavor scheme / Bertone, Valerio (Oxford U., Theor. Phys.) ; Camarda, Stefano (CERN) ; Cooper-Sarkar, Amanda (Oxford U., Theor. Phys.) ; Glazov, Alexandre (DESY) ; Luszczak, Agnieszka (Cracow Tech. U.) ; Pirumov, Hayk (DESY) ; Plačakytė, Ringaile (DESY) ; Rabbertz, Klaus (KIT, Karlsruhe, EKP) ; Radescu, Voica (DESY) ; Rojo, Juan (Oxford U., Theor. Phys.) et al. /xFitter Developers' team
The charm quark mass is one of the fundamental parameters of the Standard Model Lagrangian. In this work we present a determination of the MSbar charm mass from a fit to the inclusive and charm HERA deep-inelastic structure function data. [...]
arXiv:1605.01946; OUTP-16-10P; DESY-16-078.- 2016-08-08 - 38 p. - Published in : JHEP 08 (2016) 050 Article from SCOAP3: PDF; Fulltext: PDF; Springer Open Access article: PDF;

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Probing the strange content of the proton with charm production in charged current at LHeC / Abdolmaleki, Hamed (Semnan U.) ; Bertone, Valerio (INFN, Pavia ; Pavia U.) ; Britzger, Daniel (Munich, Max Planck Inst.) ; Camarda, Stefano (CERN) ; Cooper-Sarkar, Amanda (Oxford U.) ; Geiser, Achim (DESY) ; Giuli, Francesco (INFN, Rome2 ; Rome U., Tor Vergata) ; Glazov, Alexander (DESY) ; Luszczak, Agnieszka (Cracow Tech. U.) ; Novikov, Ivan (Dubna, JINR) et al. /xFitter Developers' Team
We study charm production in charged-current deep-inelastic scattering (DIS) using the xFitter framework. Recent results from the LHC have focused renewed attention on the determination of the strange-quark parton distribution function (PDF) and the DIS charm process provides important complementary constraints on this quantity. [...]
arXiv:1907.01014; DESY-19-107.- 2019-10-22 - 19 p. - Published in : Eur. Phys. J. C 79 (2019) 864 Article from SCOAP3: PDF; Fulltext: PDF;

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CaloChallenge 2022: A Community Challenge for Fast Calorimeter Simulation / Krause, Claudius (ed.) (Vienna, OAW ; Heidelberg U.) ; Faucci Giannelli, Michele (ed.) (INFN, Rome2 ; Chalmers U. Tech.) ; Kasieczka, Gregor (ed.) (Hamburg U.) ; Nachman, Benjamin (ed.) (LBNL, Berkeley) ; Salamani, Dalila (ed.) (CERN) ; Shih, David (ed.) (Rutgers U., Piscataway) ; Zaborowska, Anna (ed.) (CERN) ; Amram, Oz (Fermilab) ; Borras, Kerstin (DESY ; Aachen, Tech. Hochsch.) ; Buckley, Matthew R. (Rutgers U., Piscataway) et al.
We present the results of the "Fast Calorimeter Simulation Challenge 2022" - the CaloChallenge. [...]
arXiv:2410.21611 ; HEPHY-ML-24-05 ; FERMILAB-PUB-24-0728-CMS ; TTK-24-43. - 204.
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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;

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Indirect $\mathcal{CP}$ probes of the Higgs-top-quark interaction: current LHC constraints and future opportunities / Bahl, Henning (DESY) ; Bechtle, Philip (Bonn U.) ; Heinemeyer, Sven (CSIC, Madrid ; Cantabria Inst. of Phys.) ; Katzy, Judith (DESY) ; Klingl, Tobias (Bonn U.) ; Peters, Krisztian (DESY) ; Saimpert, Matthias (CERN) ; Stefaniak, Tim (DESY) ; Weiglein, Georg (DESY)
The $\mathcal{CP}$ structure of the Higgs boson in its coupling to the particles of the Standard Model is amongst the most important Higgs boson properties which have not yet been constrained with high precision. In this study, all relevant inclusive and differential Higgs boson measurements from the ATLAS and CMS experiments are used to constrain the $\mathcal{CP}$-nature of the top-Yukawa interaction. [...]
arXiv:2007.08542; DESY-20-102.- 2020 - 55 p. - Published in : JHEP 2011 (2020) 127 Article from SCOAP3: PDF; Fulltext: PDF;

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Report on the Advanced Linear Collider Study Group (ALEGRO) Workshop 2024 / Andriyash, I.A. (Palaiseau, Lab. Opt. Appl.) ; Apsimon, O. (Manchester U.) ; Backhouse, M. (JAI, UK) ; Benedetti, C. (LBL, Berkeley) ; Bulanov, S.S. (LBL, Berkeley) ; Caldwell, A. (Munich, Max Planck Inst.) ; Chen, Min (Shanghai Jiao Tong U.) ; Cilento, V. (CERN) ; Corde, S. (Palaiseau, Lab. Opt. Appl.) ; D'Arcy, R. (Oxford U.) et al.
The workshop focused on the application of ANAs to particle physics keeping in mind the ultimate goal of a collider at the energy frontier (10 TeV, e$^+$/e$^-$, e$^-$/e$^-$, or $\gamma\gamma$). [...]
arXiv:2408.03968. - 72.
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QCD analysis of pion fragmentation functions in the xFitter framework / Abdolmaleki, Hamed (IPM, Tehran) ; Soleymaninia, Maryam (IPM, Tehran) ; Khanpour, Hamzeh (USTM, Behshahr ; IPM, Tehran) ; Amoroso, Simone (DESY) ; Giuli, Francesco (INFN, Rome2 ; Rome U., Tor Vergata) ; Glazov, Alexander (DESY) ; Luszczak, Agnieszka (Cracow Tech. U.) ; Olness, Fredrick (Southern Methodist U.) ; Zenaiev, Oleksandr (CERN) /xfitter Developers’ Team
We present the first open-source analysis of fragmentation functions (FFs) of charged pions (entitled IPM-xFitter) computed at next-to-leading order (NLO) and next-to-next-to-leading order (NNLO) accuracy in perturbative QCD using the xFitter framework. This study incorporates a comprehensive and up-to-date set of pion production data from single-inclusive annihilation (SIA) processes, as well as the most recent measurements of inclusive cross-sections of single pion by the BELLE collaboration. [...]
arXiv:2105.11306.- 2021-09-01 - 17 p. - Published in : Phys. Rev. D 104 (2021) 056019 Fulltext: PDF; Fulltext from publisher: PDF;

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