Central exclusive production within the Durham model: A Review

Harland–Lang, Lucian; Khoze, V. A.; Ryskin, M. G.; Stirling, W.J.

doi:10.1142/s0217751x14300312

Cited by 49 publications

(85 citation statements)

References 261 publications

(451 reference statements)

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“…Over the last decade there has been a steady rise of theoretical and experimental interest in studies of this process in high-energy hadronic collisions, see [1][2][3][4] for reviews. Theoretically, the study of CEP requires the development of a framework which is quite different from that used to describe the inclusive processes more commonly considered at hadron colliders.…”

Section: Pp(p) → P + X + P(p)mentioning

confidence: 99%

“…One possibility to achieve this is the two-photon fusion a e-mail: l.harland-lang@ucl.ac.uk process γ γ → X , where the radiated photons couple to the electromagnetic charge of the whole protons. Alternatively, the process may be mediated purely by the strong interaction: provided the object X mass is large enough, this can be considered in the framework of pQCD, via the so-called Durham model [3,4]. Finally it is possible for 'photoproduction' reactions to occur, where one proton interacts electromagnetically and one interacts strongly.…”

Section: Pp(p) → P + X + P(p)mentioning

confidence: 99%

“…CEP processes that proceed purely by the strong interaction can be described by the 'Durham' model, a pQCD-based approach that may be applied when the object mass M X is sufficiently high, see [1,3,25] for reviews. The formalism used to calculate the perturbative CEP cross section is explained in detail elsewhere [1,6,[26][27][28][29][30] and we will only present a very brief summary here.…”

Section: Basic Formalismmentioning

confidence: 99%

“…where the J P z indicate the parity and spin projection on the gg axis, and T λ 1 λ 2 are the corresponding g(λ 1 )g(λ 2 ) → X helicity amplitudes, see [3,6] for more details. In the forward proton limit (i.e.…”

Section: Basic Formalismmentioning

confidence: 99%

“…energy √ s and choice of PDF set [3,6]. The on-shell decomposition (4) is used throughout, unless otherwise stated.…”

Section: Basic Formalismmentioning

confidence: 99%

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Exclusive physics at the LHC with SuperChic 2

2016

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We present a range of physics results for central exclusive production processes at the LHC, using the new SuperChic 2 Monte Carlo event generator. This includes significant theoretical improvements and updates, most importantly a fully differential treatment of the soft survival factor, as well as a greater number of generated processes. We provide an overview of the latest theoretical framework, and consider in detail a selection of final states, namely exclusive 2 and 3 jets, photoproduced vector mesons, two-photon initiated muon and W boson pairs and heavy χ c,b quarkonia.

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Section: Pp(p) → P + X + P(p)mentioning

confidence: 99%

Section: Pp(p) → P + X + P(p)mentioning

confidence: 99%

Section: Basic Formalismmentioning

confidence: 99%

Section: Basic Formalismmentioning

confidence: 99%

“…energy √ s and choice of PDF set [3,6]. The on-shell decomposition (4) is used throughout, unless otherwise stated.…”

Section: Basic Formalismmentioning

confidence: 99%

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Exclusive physics at the LHC with SuperChic 2

2016

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The production of a diphoton resonance via photon-photon fusion

Harland–Lang

Khoze

Ryskin

2016

J. High Energ. Phys.

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Motivated by the recent LHC observation of an excess of diphoton events around an invariant mass of 750 GeV, we discuss the possibility that this is due to the decay of a new scalar or pseudoscalar resonance dominantly produced via photon-photon fusion. We present a precise calculation of the corresponding photon-photon luminosity in the inclusive and exclusive scenarios, and demonstrate that the theoretical uncertainties associated with these are small. In the inclusive channel, we show how simple cuts on the final state may help to isolate the photon-photon induced cross section from any gluongluon or vector boson fusion induced contribution. In the exclusive case, that is where both protons remain intact after the collision, we present a precise cross section evaluation and show how this mode is sensitive to the parity of the object, as well as potential CP -violating effects. We also comment on the case of heavy-ion collisions and consider the production of new heavy colourless fermions, which may couple to such a resonance.

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Planar radiation zeros in five-parton QCD amplitudes

Harland–Lang

2015

J. High Energ. Phys.

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We demonstrate the existence of 'planar', or 'type-II', radiation zeros in 5-parton QCD scattering processes. That is, the Born amplitudes are shown to completely vanish for particular kinematic configurations, when all the particle 3-momenta lie in a plane. This result is shown to follow particularly simply from the known 'BCJ' relations between the colour-ordered tree amplitudes, and the MHV formalism is used to express the additional kinematic constraint as a relatively simple expression in terms of only rapidity differences between the final-state partons. In addition, we find that zeros exist for nonplanar configurations of the final-state partons, but for which the normal 'type-I' conditions on the particle four-momenta do not generally apply. We present numerical results and comment on the possibility of observing planar radiation zeros in hadronic collisions, via central exclusive three-jet production.

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Central exclusive production within the Durham model: A Review

Cited by 49 publications

References 261 publications

Exclusive physics at the LHC with SuperChic 2

Exclusive physics at the LHC with SuperChic 2

The production of a diphoton resonance via photon-photon fusion

Planar radiation zeros in five-parton QCD amplitudes

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