Valery Khoze (IPPP, Durham & PNPI, St.Petersburg)

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Presentation transcript:

Valery Khoze (IPPP, Durham & PNPI, St.Petersburg) Krakow, 5-8 September, 2017 PHOTON-PHOTON COLLISIONS AT THE LHC (very selected topics) Valery Khoze (IPPP, Durham & PNPI, St.Petersburg) (in collaboration with Lucian Harland-Lang and Misha Ryskin) 5-8

Introduction and Motivation. SuperChic- MC and Survival Guide Photon-initiated processes with rapidity gaps Summary and Outlook. The photon PDF and photon-photon Luminosities

Antoni, Mariola,Krzysztof, Mateusz, Daniel , Piotr, Rafal,Marta,Boris

Modelling Exclusive Photon-Photon collisions

In fact, the situation is more complicated due to the effects caused by the polarization structure of the production amplitude.

Durham Group-KMR Tel-Aviv Group- GLM S. Ostapchenko… Lonnblad & Zlebcik

+ absorptive/rescattering effects- survival factor KMR-2001  X  ‘Large’ Pomeron size in the production of the small size objects. + absorptive/rescattering effects- survival factor KMR-2001

Photon-photon Luminosities

Not so long ago worrisome range

almost sufficient for the LHC pheno purposes Including dominant elastic component strongly reduces the PDF uncertainty- almost sufficient for the LHC pheno purposes

(pre ‘750-explosion’)  HKR-16 HKR,

MNSZ, PRL 117,242002 (2016), 1708.01256. LUXqed-photon PDF determined in terms of measured EM proton structure functions F2 and FL. Currently the most precise calculation when considering inclusive production processes

Comparison with LUXqed Agreement between HKR and LUXqed within 10-20% in the phenomenologically relevant region

Photon-initiated processes with rapidity gaps Caveat: in the real life, when studying photon-photon processes we as a rule need to go beyond the inclusive photon PDF ( event selection: rapidity gaps, isolation cuts..) HKR arXiv:1601.03772

(satisfies veto) (RG veto in DGLAP equation)

Suppression due to LRG veto. phenomenological objects only-factorization explicitly violated by rescattering effects

gg collisions- applications CD Near beam Detectors Process Installed (AFP) Installed (CT-PPS) projects …and p …and A Extensive Program   , ee QED processes   QCD (jets..)   WW anomalous couplings   squark, top… pairs   Charginos (natural SUSY)  New BSM objects photon-proton/nucleus collider @ LHC

Diphoton X-Pair Production HKSS, arXiv:1110.4320 electroweakinos (compressed mass BSM scenarios)

Challenges Tim Matin, EPS-17, ArxiV:1708.04053 (Mateusz) (KMR, KMOR-2001) Mateusz Dyndal, Laurent Schoeffel Phys.Lett. B741 (2015) 66-70

Checked explicitly that taking this model for proton overlap we arrive To our understanding is essentially a simplified version of the SuperChic (KMR) model for absorption. Evaluation of Survival factor in SuperChic2 is based on measured elastic cross section. The difference is due to the fact that SuperChic explicitly incorporates the impact parameter dependence of the dimuon production amplitude. KMRO-2001 Checked explicitly that taking this model for proton overlap we arrive at a very similar result to SuperChic. In any case this is worth revisiting (many sides, many sides ). 'EPA + finite size corrections'     section 4.3 of 1508.02718  Usual Suspects: ( SD simulation...)

Summary & Outlook A formalism (HKR-16) is developed allowing to describe photon-induced events with LRG in terms of modified photon PDF with consistent implementation of the soft survival effects.

“The - Resonance that Stole Christmas 2015” 750 GeV ATLAS &CMS seminar on 15 Dec. 2015 The ATLAS announcement of a 3.6  local excess in diphotons with invariant mass ~750 GeV in first batch of LHC Run –II data, combined with CMS announcing 2.6  local excess. EW Moriond, 17.03.2016 Theoretical community –frenzy of model building: >150 papers within a month. Unprecedented explosion in the number of exploratory papers. (More than 600 papers) If it were not a statistical fluctuation, a natural minimal interpretation: scalar/pseudoscalar resonance coupling dominantly to photons. As an outcome -great improvement in our understanding of photon PDF and development of the effective tools for analysing potential diphoton resonances.