Measurement of the Z boson production cross-section in pp collisions at s = 5.02 TeV

• Published in: The journal of high energy physics 2024-02, Vol.2024 (2), p.70
• Main Authors: Agapopoulou, C., Alessio, F., Aliouche, Z., Back, J. J., Barsuk, S., Belin, S., Bertella, C., Bian, L., Billoir, P., Bitadze, A., Blake, T., Butter, J. S., Cai, H., Calabrese, R., Cambon Bouzas, J., Chubykin, A., Cooke, N., Dadabaev, S., De Paula, L., De Serio, M., Dedu, V., Dembinski, H.-P., Denysenko, V., Douglas, L., Dziurda, A., Fang, B., Faria, M., Ferro-Luzzi, M., Fiorini, M., Fitzgerald, D. S., Franzoso, E., Frei, C., Fujii, Y., Gersabeck, E., Gkougkousis, E. L., Guittiere, M., Haimberger, J., Han, X., Hansmann-Menzemer, S., Hatch, M., Henderson, C., Hollitt, S. E., Hu, X., Huang, X., Hunter, R. J., Jawahery, A., Kang, Y., Kmiec, M. R., Korolev, M., Krokovny, P., Krupa, W., Kucewicz, W., López Soliño, S., Malecki, B., Mariani, S., Mcconnell, L., Mitchell, S. E., Mödden, A., Mu, Z. M., Müller, K., Nanut, T., Normand, C., Novoa Fernandez, J., Palano, A., Pappalardo, L. L., Patrignani, C., Pereiro Castro, A., Perro, A., Petrucci, S., Prasanth, K., Punzi, G., Rama, M., Ramírez García, M., Rangel, M. S., Reiss, F., Rodriguez Rodriguez, E., Sagidova, N., Satta, A., Schneider, O., Stenyakin, O., Strekalina, D., Sun, L., Terentev, A., Thompson, D. J. D., Tou, D. Y., Van Laak, R., Villa, A., Voropaev, N., Wang, Z., Wei, Y., Wilkinson, M. K., Williams, M., Xu, M., Zhang, D., Zhang, Y., Zhao, Y., Zhou, T., Zucchelli, S., Zunica, G.
• Format: Article
• Language: English
• Subjects: Atoms & subatomic particles; Center of mass; Classical and Quantum Gravitation; Collaboration; Collisions; Cross-sections; Elementary Particles; Energy; Large Hadron Collider; Luminosity; Muons; Physics; Physics and Astronomy; Quantum Field Theories; Quantum Field Theory; Quantum Physics; Quarks; Radiation; Regular Article - Experimental Physics; Relativity Theory; Sensors; Simulation; String Theory; Transverse momentum
• ISSN: 1029-8479
• DOI: 10.1007/JHEP02(2024)070

A bstract The first measurement of the Z boson production cross-section at centre-of-mass energy s = 5 . 02 TeV in the forward region is reported, using pp collision data collected by the LHCb experiment in year 2017, corresponding to an integrated luminosity of 100 ± 2 pb − 1 . The production cross-section is measured for final-state muons in the pseudorapidity range 2 . 0 < η < 4 . 5 with transverse momentum p T > 20 GeV/ c . The integrated cross-section is determined to be σ Z → μ + μ − = 39.6 ± 0.7 stat ± 0.6 syst ± 0.8 lumi pb for the di-muon invariant mass in the range 60 < M μμ < 120 GeV/ c 2 . This result and the differential cross-section results are in good agreement with theoretical predictions at next-to-next-to-leading order in the strong coupling constant. Based on a previous LHCb measurement of the Z boson production cross-section in p Pb collisions at s NN = 5 . 02 TeV, the nuclear modification factor R p Pb is measured for the first time at this energy. The measured values are 1.2 − 0.3 + 0.5 (stat) ± 0 . 1(syst) in the forward region (1.53 < y μ ∗ < 4 . 03) and 3.6 − 0.9 + 1.6 (stat) ± 0 . 2(syst) in the backward region ( − 4 . 97 < y μ ∗ < − 2 . 47), where y μ ∗ represents the muon rapidity in the centre-of-mass frame.