Abstract

Z bosons are short lived and do not participate in the strong interaction. Thus their production yields, observed via dilepton decay channels in proton-lead and lead-lead collisions, provide direct tests of both binary collision scaling and the nuclear modification of parton distribution functions (nPDF). Proton-lead collisions further provide a relatively clean environment for benchmarking nuclear parton distribution functions (PDF). The ATLAS detector has a broad acceptance in the muon and electron channels, with excellent performance even in the high occupancy environment of central heavy-ion collisions. In this talk, Z yields, are presented differentially in rapidity and as a function of centrality in lead-lead and proton-lead collisions.

Highlights

  • Electroweak bosons are a valuable tool to study the hot and dense medium created in heavy-ion collisions

  • Tceosltliosfiobnins aarty√cosNllNisi=on2s.7c6alTinegVwsihthoiwnehdetahvayt ion the (HI) production rate of Z boson in Pb+Pb collisions is proportional to the number of binary collisions in the ion-ion interaction [1]

  • The experimental precision of these measurements, did not reach the level needed in order to determine whether there are nuclear modifications of the parton distribution functions (PDF)

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Summary

Introduction

Electroweak bosons are a valuable tool to study the hot and dense medium created in heavy-ion collisions Since they are insensitive to the strong force and do not interact with the QCD medium, the rate of their production in different centrality classes, allows a collisions. The first measurement of the Z boson in HI tceosltliosfiobnins aarty√cosNllNisi=on2s.7c6alTinegVwsihthoiwnehdetahvayt ion the (HI) production rate of Z boson in Pb+Pb collisions is proportional to the number of binary collisions in the ion-ion interaction [1]. This finding confirmed the applicability of pQCD calculations in heavy-ion collisions, as well as the Glauber model description of the nucleonic geometry of the collisions. Related measurements have been performed by the ALICE, CMS, and LHCb collaborations [3, 4, 5, 6]

Proton-Proton Collisions
Proton-Lead Collisions
Findings
Lead-Lead Collisions
Full Text
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