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)
Summary
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]
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