Probing Anomalous Quartic Interactions at the LHC with proton tagging

Cristian Baldenegro,A Ayala Mercado,E Cuautle Flores

doi:10.1051/epjconf/201817206002

Abstract

One of the main goals of the Large Hadron Collider is to find signatures of physics Beyond the Standard Model of particle physics. One way to do this is by studying with high precision the interactions of the Standard Model. In this talk, we address the discovery potential of New Physics in the exclusive channel pp → p X p which relies on the general purpose detectors at the Large Hadron Collider and their respective forward proton detector stations, located at about ~ 210 m w.r.t. the interaction point. These reactions are highly sensitive to quartic electroweak gauge interactions. As a proof of concept, we discuss the exclusive diphoton production at high diphoton invariant mass. We quote sensitivities on the anomalous γγγγ coupling for an integrated luminosity of 300 fb1 at the center-of-mass energy of 14 TeV.We also discuss the discovery potential of 3γZ anomalous quartic gauge coupling by measuring the pp → p(γγ → Zγ)p reaction.

Highlights

One of the primary goals of the Large Hadron Collider (LHC) is the search of signatures of Beyond the Standard Model (BSM) physics
The CMS-TOTEM Precision Proton Spectrometer (CT-PPS) and the ATLAS Forward Physics (AFP) experiments are equipped and operational for the standard high luminosity fills at the LHC to study exclusive and semi-exclusive reactions
The full reconstruction of the final state gives three main advantages: i) due to the kinematic constraint, the number of background events stemming from the simultaneous secondary interactions at the LHC, the pile-up events, is negligible; ii) the production of a massive system X is dominated by photon-exchange events and; iii) systematic uncertainties related to proton dissociation are absent in these reactions, since protons remain intact

Summary

Introduction

One of the primary goals of the Large Hadron Collider (LHC) is the search of signatures of Beyond the Standard Model (BSM) physics. Complementary to the ATLAS Pb-Pb measurement, the pp process will probe diphoton masses from ∼ 300 GeV to 2 TeV with high transverse momenta photons and with proton tagging As explained below, this gives sensitivity to regions where the anomalous interaction effects are more important. We see that the dominant background, by several orders of magnitude, at high invariant mass is the γγ+ pile-up contribution, which is due to the overlap of non-diffractive diphoton production and the presence of two intact protons due to the secondary interactions, commonly known as pile-up interactions This background can be largely suppressed by applying the rapidity and mass matching criteria (see Fig. 7) between the forward proton detectors information and the central detector information.

Quark and Lepton loops contribution

Conclusions