Abstract
We discuss production of W+W− pairs in proton-proton collisions induced by two-photon fusion including, for a first time, transverse momenta of incoming photons. The unintegrated inelastic fluxes (related to proton dissociation) of photons are calculated based on modern parametrizations of deep inelastic structure functions in a broad range of their arguments (x and Q2). In our approach we can get separate contributions of different W helicities states. Several one- and two-dimensional differential distributions are shown and discussed. The present results are compared to the results of previous calculations within collinear factorization approach. Similar results are found except of some observables such as e.g. transverse momentum of the pair of W+ and W−. We find large contributions to the cross section from the region of large photon virtualities. We show decomposition of the total cross section as well as invariant mass distribution into the polarisation states of both W bosons. The role of the longitudinal FL structure function is quantified. Its inclusion leads to a 4–5% decrease of the cross section, almost independent of MWW.
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V.M. Budnev, I.F. Ginzburg, G.V. Meledin and V.G. Serbo, The Two photon particle production mechanism. Physical problems. Applications. Equivalent photon approximation, Phys. Rept. 15 (1975) 181 [INSPIRE].
G.G. da Silveira, L. Forthomme, K. Piotrzkowski, W. Schäfer and A. Szczurek, Central μ + μ − production via photon-photon fusion in proton-proton collisions with proton dissociation, JHEP 02 (2015) 159 [arXiv:1409.1541] [INSPIRE].
M. Luszczak, W. Schäfer and A. Szczurek, Two-photon dilepton production in proton-proton collisions: two alternative approaches, Phys. Rev. D 93 (2016) 074018 [arXiv:1510.00294] [INSPIRE].
M. Łuszczak, A. Szczurek and C. Royon, W + W − pair production in proton-proton collisions: small missing terms, JHEP 02 (2015) 098 [arXiv:1409.1803] [INSPIRE].
P. Lebiedowicz and A. Szczurek, Exclusive production of heavy charged Higgs boson pairs in the pp → ppH + H − reaction at the LHC and a future circular collider, Phys. Rev. D 91 (2015) 095008 [arXiv:1502.03323] [INSPIRE].
A.D. Martin, R.G. Roberts, W.J. Stirling and R.S. Thorne, Parton distributions incorporating QED contributions, Eur. Phys. J. C 39 (2005) 155 [hep-ph/0411040] [INSPIRE].
NNPDF collaboration, R.D. Ball et al., Parton distributions with QED corrections, Nucl. Phys. B 877 (2013) 290 [arXiv:1308.0598] [INSPIRE].
C. Schmidt, J. Pumplin, D. Stump and C.P. Yuan, CT14QED parton distribution functions from isolated photon production in deep inelastic scattering, Phys. Rev. D 93 (2016) 114015 [arXiv:1509.02905] [INSPIRE].
xFitter Developers’ Team collaboration, F. Giuli et al., The photon PDF from high-mass Drell-Yan data at the LHC, Eur. Phys. J. C 77 (2017) 400 [arXiv:1701.08553] [INSPIRE].
I.F. Ginzburg and A. Schiller, Search for a heavy magnetic monopole at the Tevatron and CERN LHC, Phys. Rev. D 57 (1998) 6599 [hep-ph/9802310] [INSPIRE].
A. Manohar, P. Nason, G.P. Salam and G. Zanderighi, How bright is the proton? A precise determination of the photon parton distribution function, Phys. Rev. Lett. 117 (2016) 242002 [arXiv:1607.04266] [INSPIRE].
A.V. Manohar, P. Nason, G.P. Salam and G. Zanderighi, The Photon Content of the Proton, JHEP 12 (2017) 046 [arXiv:1708.01256] [INSPIRE].
E. Chapon, C. Royon and O. Kepka, Anomalous quartic WWγγ, ZZγγ and trilinear WWγ couplings in two-photon processes at high luminosity at the LHC, Phys. Rev. D 81 (2010) 074003 [arXiv:0912.5161] [INSPIRE].
T. Pierzchala and K. Piotrzkowski, Sensitivity to anomalous quartic gauge couplings in photon-photon interactions at the LHC, Nucl. Phys. Proc. Suppl. 179-180 (2008) 257 [arXiv:0807.1121] [INSPIRE].
CMS collaboration, Evidence for exclusive γγ → W + W − production and constraints on anomalous quartic gauge couplings in pp collisions at \( \sqrt{s}=7 \) and 8 TeV, JHEP 08 (2016) 119 [arXiv:1604.04464] [INSPIRE].
ATLAS collaboration, Measurement of exclusive γγ → W + W − production and search for exclusive Higgs boson production in pp collisions at \( \sqrt{s}=8 \) TeV using the ATLAS detector, Phys. Rev. D 94 (2016) 032011 [arXiv:1607.03745] [INSPIRE].
W. Kilian, T. Ohl, J. Reuter and M. Sekulla, Resonances at the LHC beyond the Higgs boson: The scalar/tensor case, Phys. Rev. D 93 (2016) 036004 [arXiv:1511.00022] [INSPIRE].
R.L. Delgado, A. Dobado and F.J. Llanes-Estrada, Coupling WW, ZZ unitarized amplitudes to γγ in the TeV region, Eur. Phys. J. C 77 (2017) 205 [arXiv:1609.06206] [INSPIRE].
M. Szleper, The Higgs boson and the physics of WW scattering before and after Higgs discovery, arXiv:1412.8367 [INSPIRE].
O. Nachtmann, F. Nagel, M. Pospischil and A. Utermann, Effective-Lagrangian approach to γγ → WW. I. Couplings and amplitudes, Eur. Phys. J. C 45 (2006) 679 [hep-ph/0508132] [INSPIRE].
J. Alwall et al., The automated computation of tree-level and next-to-leading order differential cross sections and their matching to parton shower simulations, JHEP 07 (2014) 079 [arXiv:1405.0301] [INSPIRE].
H. Abramowicz, E.M. Levin, A. Levy and U. Maor, A Parametrization of σ T (γ * p) above the resonance region Q 2 ≥ 0, Phys. Lett. B 269 (1991) 465 [INSPIRE].
H. Abramowicz and A. Levy, The ALLM parameterization of σ tot(γ * p): An Update, hep-ph/9712415 [INSPIRE].
P.E. Bosted and M.E. Christy, Empirical fit to inelastic electron-deuteron and electron-neutron resonance region transverse cross-sections, Phys. Rev. C 77 (2008) 065206 [arXiv:0711.0159] [INSPIRE].
HERMES collaboration, A. Airapetian et al., Inclusive Measurements of Inelastic Electron and Positron Scattering from Unpolarized Hydrogen and Deuterium Targets, JHEP 05 (2011) 126 [arXiv:1103.5704] [INSPIRE].
E143 collaboration, K. Abe et al., Measurements of R = σ L /σ T for 0.03 < x < 0.1 and fit to world data, Phys. Lett. B 452 (1999) 194 [hep-ex/9808028] [INSPIRE].
A.D. Martin, W.J. Stirling, R.S. Thorne and G. Watt, Parton distributions for the LHC, Eur. Phys. J. C 63 (2009) 189 [arXiv:0901.0002] [INSPIRE].
A. Szczurek and V. Uleshchenko, Nonpartonic components in the nucleon structure functions at small Q 2 in the broad range of x, Eur. Phys. J. C 12 (2000) 663 [hep-ph/9904288] [INSPIRE].
A. Szczurek and V. Uleshchenko, On the range of validity of the QCD improved parton model, Phys. Lett. B 475 (2000) 120 [hep-ph/9911467] [INSPIRE].
M. Drees and D. Zeppenfeld, Production of Supersymmetric Particles in Elastic ep Collisions, Phys. Rev. D 39 (1989) 2536 [INSPIRE].
CMS collaboration, Measurement of W + W − production and search for the Higgs boson in pp collisions at \( \sqrt{s}=7 \) TeV, Phys. Lett. B 699 (2011) 25 [arXiv:1102.5429] [INSPIRE].
ATLAS collaboration, Measurement of the WW cross section in \( \sqrt{s}=7 \) TeV pp collisions with the ATLAS detector and limits on anomalous gauge couplings, Phys. Lett. B 712 (2012) 289 [arXiv:1203.6232] [INSPIRE].
T. Hahn and M. Pérez-Victoria, Automatized one loop calculations in four-dimensions and D-dimensions, Comput. Phys. Commun. 118 (1999) 153 [hep-ph/9807565] [INSPIRE].
P. Lebiedowicz, R. Pasechnik and A. Szczurek, QCD diffractive mechanism of exclusive W + W − pair production at high energies, Nucl. Phys. B 867 (2013) 61 [arXiv:1203.1832] [INSPIRE].
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Łuszczak, M., Schäfer, W. & Szczurek, A. Production of W+W− pairs via γ*γ* → W+W− subprocess with photon transverse momenta. J. High Energ. Phys. 2018, 64 (2018). https://doi.org/10.1007/JHEP05(2018)064
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DOI: https://doi.org/10.1007/JHEP05(2018)064