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The Forward Physics Facility at the High-Luminosity LHC
/ Feng, Jonathan L. (UC, Irvine) ; Kling, Felix (DESY) ; Reno, Mary Hall (Iowa U.) ; Rojo, Juan (NIKHEF, Amsterdam ; Vrije U., Amsterdam) ; Soldin, Dennis (Delaware U.) ; Anchordoqui, Luis A. (Lehman Coll.) ; Boyd, Jamie (CERN) ; Ismail, Ahmed (Oklahoma State U.) ; Harland-Lang, Lucian (Oxford U. ; Oxford U., Theor. Phys.) ; Kelly, Kevin J. (CERN) et al.
High energy collisions at the High-Luminosity Large Hadron Collider (LHC) produce a large number of particles along the beam collision axis, outside of the acceptance of existing LHC experiments. The proposed Forward Physics Facility (FPF), to be located several hundred meters from the ATLAS interaction point and shielded by concrete and rock, will host a suite of experiments to probe Standard Model (SM) processes and search for physics beyond the Standard Model (BSM) [...]
arXiv:2203.05090; UCI-TR-2022-01; CERN-PBC-Notes-2022-001; INT-PUB-22-006; BONN-TH-2022-04; FERMILAB-PUB-22-094-ND-SCD-T.-
Geneva : CERN, 2023-01-20 - 413 p.
- Published in : J. Phys. G 50 (2023) 030501
Fulltext: blank - PDF; 2203.05090 - PDF; FERMILAB-PUB-22-094-ND-SCD-T - PDF; Fulltext from Publisher: PDF; External links: Fermilab Library Server; eConf
In : 2021 Snowmass Summer Study, Seattle, WA, United States, 11 - 20 July 2021, pp.030501
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Higgs boson cross sections for the high-energy and high-luminosity LHC: cross-section predictions and theoretical uncertainty projections
/ Calderon Tazon, Alicia (Universidad de Cantabria and CSIC (ES)) ; Caola, Fabrizio (University of Durham (GB)) ; Campbell, John (Fermilab (US)) ; Francavilla, Paolo (Universita & INFN Pisa (IT)) ; Marchiori, Giovanni (Centre National de la Recherche Scientifique (FR)) ; Becker, Kathrin (Albert Ludwigs Universitaet Freiburg (DE)) ; Bertella, Claudia (Chinese Academy of Sciences (CN)) ; Bonvini, Marco (Sapienza Universita e INFN, Roma I (IT)) ; Chen, Xuan (Zuerich University (CH)) ; Frederix, Rikkert (Technische Universität Muenchen (DE)) et al.
This note summarizes the state-of-the-art predictions for the cross sections expected for Higgs boson production in the 27 TeV proton-proton collisions of a high-energy LHC, including a full theoretical uncertainty analysis. It also provides projections for the progress that may be expected on the timescale of the high-luminosity LHC and an assessment of the main limiting factors to further reduction of the remaining theoretical uncertainties..
LHCHXSWG-2019-001.-
Geneva : CERN, 01 - 17.
Fulltext: PDF;
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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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A Determination of the Charm Content of the Proton
/ Ball, Richard D. (U. Edinburgh, Higgs Ctr. Theor. Phys.) ; Bertone, Valerio (Oxford U., Theor. Phys.) ; Bonvini, Marco (Oxford U., Theor. Phys.) ; Carrazza, Stefano (CERN) ; Forte, Stefano (Milan U. ; INFN, Milan) ; Guffanti, Alberto (Turin U. ; INFN, Turin) ; Hartland, Nathan P. (Oxford U., Theor. Phys.) ; Rojo, Juan (Oxford U., Theor. Phys.) ; Rottoli, Luca (Oxford U., Theor. Phys.)
/NNPDF Collaboration
We present an unbiased determination of the charm content of the proton, in which the charm parton distribution function (PDF) is parametrized on the same footing as the light quarks and the gluon in a global PDF analysis. This determination relies on the calculation of deep-inelastic structure functions in the FONLL scheme, generalized to account for massive charm-initiated contributions. [...]
arXiv:1605.06515; EDINBURGH-2016-06; CERN-TH-2016-087; OUTP-16-03P; TIF-UNIMI-2016-3; EDINBURGH 2016-06; CERN-TH-2016-087; OUTP-16-03P; TIF-UNIMI-2016-3.-
2016-11-24 - 35 p.
- Published in : Eur. Phys. J. C 76 (2016) 647
Article from SCOAP3: PDF; Fulltext: PDF;
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Charm in Deep-Inelastic Scattering
/ Ball, Richard D. (U. Edinburgh, Higgs Ctr. Theor. Phys. ; CERN) ; Bonvini, Marco (Oxford U., Theor. Phys.) ; Rottoli, Luca (Oxford U., Theor. Phys.)
We show how to extend systematically the FONLL scheme for inclusion of heavy quark mass effects in DIS to account for the possible effects of an intrinsic charm component in the nucleon. We show that when there is no intrinsic charm, FONLL is equivalent to S-ACOT to any order in perturbation theory, while when an intrinsic charm component is included FONLL is identical to ACOT, again to all orders in perturbation theory. [...]
arXiv:1510.02491; EDINBURGH-2015-06; CERN-PH-TH-2015-118; OUTP-15-25P; EDINBURGH-2015-06; CERN-PH-TH-2015-118; OUTP-15-25P.-
Geneva Geneva : CERN, CERN, 2015-11-18 - 43 p.
- Published in : JHEP 11 (2015) 122
Article from SCOAP3: PDF; Fulltext: PDF; Springer Open Access article: PDF; External link: Preprint
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Intrinsic charm in a matched general-mass scheme
/ Ball, Richard D. (U. Edinburgh, Higgs Ctr. Theor. Phys.) ; Bertone, Valerio (Oxford U., Theor. Phys. ; CERN) ; Bonvini, Marco (Oxford U., Theor. Phys.) ; Forte, Stefano (Milan U. ; INFN, Milan) ; Groth Merrild, Patrick (U. Edinburgh, Higgs Ctr. Theor. Phys.) ; Rojo, Juan (Oxford U., Theor. Phys.) ; Rottoli, Luca (Oxford U., Theor. Phys.)
The FONLL general-mass variable-flavour number scheme provides a framework for the matching of a calculation in which a heavy quark is treated as a massless parton to one in which the mass dependence is retained throughout. We describe how the usual formulation of FONLL can be extended in such a way that the heavy quark parton distribution functions are freely parameterized at some initial scale, rather than being generated entirely perturbatively. [...]
arXiv:1510.00009; EDINBURGH-2015-06; TIF-UNIMI-2015-11; EDINBURGH-2015-14; CERN-PH-TH-2015-176; OUTP-15-20P; EDINBURGH 2015-06; CERN-PH-TH-2015-176; TIF-UNIMI-2015-11; OUTP-15-20P.-
Geneva : CERN, 2016-03-10 - 10 p.
- Published in : Phys. Lett. B 754 (2016) 49-58
Article from SCOAP3: PDF; Fulltext: PDF; External link: Preprint
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9.
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Parton distributions with threshold resummation
/ Bonvini, Marco (Oxford U., Theor. Phys.) ; Marzani, Simone (MIT, Cambridge, CTP) ; Rojo, Juan (Oxford U., Theor. Phys.) ; Rottoli, Luca (Oxford U., Theor. Phys.) ; Ubiali, Maria (Cambridge U.) ; Ball, Richard D. (U. Edinburgh, Higgs Ctr. Theor. Phys. ; CERN) ; Bertone, Valerio (CERN) ; Carrazza, Stefano (Milan U. ; INFN, Milan) ; Hartland, Nathan P. (Oxford U., Theor. Phys.)
We construct a set of parton distribution functions (PDFs) in which fixed-order NLO and NNLO calculations are supplemented with soft-gluon (threshold) resummation up to NLL and NNLL accuracy respectively, suitable for use in conjunction with any QCD calculation in which threshold resummation is included at the level of partonic cross sections. These resummed PDF sets, based on the NNPDF3.0 analysis, are extracted from deep-inelastic scattering, Drell-Yan, and top quark pair production data, for which resummed calculations can be consistently used. [...]
arXiv:1507.01006; OUTP-15-03P; MIT-CTP-4657; CAVENDISH-HEP-15-02; CERN-PH-TH-2015-060; EDINBURGH-2015-04; TIF-UNIMI-2015-6; OUTP-15-03P; MIT-CTP 4657; CAVENDISH-HEP-15-02; CERN-PH-TH-2015-060; EDINBURGH 2015-04; TIF-UNIMI-2015-6.-
Geneva : CERN, 2015-09-28 - 44 p.
- Published in : JHEP 09 (2015) 191
Article from SCOAP3: PDF; Fulltext: PDF; Springer Open Access article: PDF; External link: Preprint
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Borel resummation of transverse momentum distributions
/ Bonvini, Marco (Genoa U. ; INFN, Genoa) ; Forte, Stefano (Milan U. ; INFN, Milan) ; Ridolfi, Giovanni (Genoa U. ; INFN, Genoa ; CERN)
We present a new prescription for the resummation of contributions due to soft gluon emission to the trasverse momentum distribution of processes such as Drell-Yan production in hadronic collisions. We show that familiar difficulties in obtaining resummed results as a function of transverse momentum starting from impact-parameter space resummation are related to the divergence of the perturbative expansion of the momentum-space result. [...]
arXiv:0807.3830; IFUM-905-FT; CERN-PH-TH-2008-149; GEF-TH-3-08; CERN-PH-TH-2008-149; GEF-TH-3-08; IFUM-905-FT.-
Geneva : CERN, 2009 - 18 p.
- Published in : Nucl. Phys. B 808 (2009) 347-363
Fulltext: PDF; External link: Preprint
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