A new approach to modelling elastic and inelastic photon-initiated production at the LHC: SuperChic 4

Harland–Lang, Lucian; Taševský, M.; Хозе, В. А.; Ryskin, M. G.

doi:10.1140/epjc/s10052-020-08455-0

Cited by 65 publications

(90 citation statements)

References 42 publications

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“…Such photoninitiated (PI) processes are a key ingredient in the LHC precision physics programme, providing a unique probe of physics within and beyond the SM, see e.g. [1] for further discussion and references, and [2][3][4][5][6] for reviews.…”

Section: Introductionmentioning

confidence: 99%

Elastic photon-initiated production at the LHC: the role of hadron-hadron interactions

2021

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We analyse in detail the role of additional hadron–hadron interactions in elastic photon–initiated (PI) production at the LHC, both in pp and heavy ion collisions. We first demonstrate that the source of difference between our predictions and other results in the literature for PI muon pair production is dominantly due to an unphysical cut that is imposed in these latter results on the dimuon–hadron impact parameter. We in addition show that this is experimentally disfavoured by the shape of the muon kinematic distributions measured by ATLAS in ultraperipheral PbPb collisions. We then consider the theoretical uncertainty due to the survival probability for no additional hadron–hadron interactions, and in particular the role this may play in the tendency for the predicted cross sections to lie somewhat above ATLAS data on PI muon pair production, in both pp and PbPb collisions. This difference is relatively mild, at the \sim 10\%∼10% level, and hence a very good control over the theory is clearly required. We show that this uncertainty is very small, and it is only by taking very extreme and rather unphysical variations in the modelling of the survival factor that this tension can be removed. This underlines the basic, rather model independent, point that a significant fraction of elastic PI scattering occurs for hadron–hadron impact parameters that are simply outside the range of QCD interactions, and hence this sets a lower bound on the survival factor in any physically reasonable approach. Finally, other possible origins for this discrepancy are discussed.

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Section: Introductionmentioning

confidence: 99%

Elastic photon-initiated production at the LHC: the role of hadron-hadron interactions

2021

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“…More recent calculations predict slightly lower absorption values for the dissociative processes[85,86].…”

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confidence: 93%

Observation of photon-induced W+W− production in pp collisions at s=13 TeV using the ATLAS detector

Aad¹,

Abbott²,

Abbott³

et al. 2021

Physics Letters B

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This letter reports the observation of photon-induced production of W-boson pairs, γ γ → W W. The analysis uses 139 fb −1 of LHC proton-proton collision data taken at √ s = 13 TeV recorded by the ATLAS experiment during the years 2015-2018. The measurement is performed selecting one electron and one muon, corresponding to the decay of the diboson system as W W → e ± νμ ∓ ν final state. The background-only hypothesis is rejected with a significance of well above 5 standard deviations consistent with the expectation from Monte Carlo simulation. A cross section for the γ γ → W W process of 3.13 ± 0.31(stat.) ± 0.28(syst.) fb is measured in a fiducial volume close to the acceptance of the detector, by requiring an electron and a muon of opposite signs with large dilepton transverse momentum and exactly zero additional charged particles. This is found to be in agreement with the Standard Model prediction.

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“…Previous phenomenology studies based on the use of the proton tagging technique to study two-photon fusion interactions can be found in refs. [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28]. Other interesting studies that aim also to describe photon fluxes in processes with proton dissociation, treated in the k T factorization framework, are presented in refs.…”

Section: Introductionmentioning

confidence: 99%

Central exclusive production of W boson pairs in pp collisions at the LHC in hadronic and semi-leptonic final states

Baldenegro

Biagi

Legras

et al. 2020

J. High Energ. Phys.

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We present a phenomenology study on central exclusive production of W+W− boson pairs in proton-proton collisions at the Large Hadron Collider at 14 TeV using the forward proton detectors, such as the ATLAS Forward Proton or the CMS-TOTEM Precision Proton Spectrometer detectors. Final states where at least one of the W bosons decay hadronically in a large-radius jet are considered. The latter extends previous efforts that consider solely leptonic final states. A measurement of exclusive W+W− also allows us to further constrain anomalous quartic gauge boson interactions between photons and W bosons. Expected limits on anomalous quartic gauge couplings $$ {a}_{0,C}^W $$ a 0 , C W associated to dimension-six effective operators are derived for the hadronic, semi-leptonic, and leptonic final states. It is found that the couplings can be probed down to one-dimensional values of $$ {a}_0^W=3.7\times {10}^{-7}{\mathrm{GeV}}^{-2} $$ a 0 W = 3.7 × 10 − 7 GeV − 2 and $$ {a}_C^W=9.2\times {10}^{-7}{\mathrm{GeV}}^{-7} $$ a C W = 9.2 × 10 − 7 GeV − 7 at 95% CL at an integrated luminosity of 300 fb−1 by combining all final states, compared to values of about $$ {a}_0^W=4\times {10}^{-6}{\mathrm{GeV}}^{-2} $$ a 0 W = 4 × 10 − 6 GeV − 2 and $$ {a}_C^W=1\times {10}^{-5}{\mathrm{GeV}}^{-2} $$ a C W = 1 × 10 − 5 GeV − 2 at 95% CL expected for the leptonic channel alone.

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A new approach to modelling elastic and inelastic photon-initiated production at the LHC: SuperChic 4

Cited by 65 publications

References 42 publications

Elastic photon-initiated production at the LHC: the role of hadron-hadron interactions

Elastic photon-initiated production at the LHC: the role of hadron-hadron interactions

Observation of photon-induced W+W− production in pp collisions at s=13 TeV using the ATLAS detector

Central exclusive production of W boson pairs in pp collisions at the LHC in hadronic and semi-leptonic final states

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