7–11 Jul 2025
University of the Witwatersrand, Johannesburg
Africa/Johannesburg timezone
Payment deadline 9 June 2025

The W boson as a probe for the initial state of hadron collisions at the LHC

10 Jul 2025, 11:50
20m
Solomon Mahlangu House (University of the Witwatersrand, Johannesburg)

Solomon Mahlangu House

University of the Witwatersrand, Johannesburg

Oral Presentation Track B - Nuclear, Particle and Radiation Physics Nuclear, Particle and Radiation Physics-2

Speaker

Stephan Potgieter (University of Cape Town)

Description

The charged vector boson (W$^\pm$) is produced in the hard partonic scattering of relativistic hadronic collisions, where its production cross-section can be calculated theoretically from perturbation theory and the relevant hadronic parton distribution functions (PDFs). Since it does not interact strongly and decays leptonically, the W boson serves as an ideal probe of the initial state of the collision - such as the contributing quark PDFs. In this presentation, the focus will be on the production of W$^\pm$ in the forward rapidity region of simulated relativistic proton-proton collisions, where the POWHEG and Pythia event generators are used to simulate the events of interest. The W$^\pm$ production is studied via the muonic decay channel as W$^+\rightarrow\mu^+\nu_\mu$ and W$^-\rightarrow\mu^-\bar{\nu}_\mu$, where the muon can be measured with the ALICE Muon Spectrometer in the forward rapidity region of $2.5 < y < 4.0$. The primary charged-particle multiplicity is introduced as an additional observable of interest to study the initial state - where the self-normalised W$\rightarrow\mu$ production as a function of the self-normalised multiplicity is defined and studied specifically. It is demonstrated that the study in proton-proton collisions can serve as a meaningful baseline measurement for other hadronic collision systems, where an outlook is presented to do the same study in proton-lead and lead-lead collisions with Run 3 data from ALICE.

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Primary author

Stephan Potgieter (University of Cape Town)

Presentation materials

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