Medium modification of photon-tagged and inclusive jets in high-multiplicity proton-proton collisions

TL;DR

This paper investigates how mini-quark-gluon plasma in high-multiplicity proton-proton collisions at 7 TeV modifies photon-tagged and inclusive jet fragmentation functions, showing significant suppression of charged hadrons at intermediate transverse momentum.

Contribution

It presents the first detailed analysis of medium-induced modifications of jets in high-multiplicity pp collisions at LHC energies.

Findings

Photon-tagged and inclusive jets are significantly modified in high-multiplicity events.

Charged hadron spectra are suppressed by 35-40% at 5-10 GeV/c.

Medium effects are substantial even in typical high-multiplicity pp events.

Abstract

We study modification of the photon-tagged and inclusive jets in $pp$ collisions at $\sqrt{s}=7$ TeV due to mini-quark-gluon plasma which can be produced in high multiplicity events. We show that for underlying events with $dN_{ch}/d\eta\sim 20-60$ the medium effects lead to a considerable modification of the photon-tagged and inclusive jet fragmentation functions. For inclusive jets the magnitude of the effect is surprisingly large. The effect is quite strong even for typical underlying events. We find that at $\sqrt{s}=7$ TeV the spectrum of charged hadrons is suppressed by $\sim 35-40$ % at $p_{T}\sim 5-10$ GeV.