Measurement of forward \(\rm Z\rightarrow e^+e^-\) production at \(\sqrt{s}=8\)TeV

• Published in: arXiv.org
• Main Authors: collaboration, LHCb, Alves, A A, Badalov, A, Baesso, C, Battista, V, Bedeschi, F, Bien, A, Bocci, V, Brook, N H, Calabrese, R, Carbone, A, Cardinale, R, K Carvalho Akiba, Cattaneo, M, Cavallero, G, Closier, J, Cojocariu, L, Collazuol, G, Cowan, G A, De Cian, M, De Paula, L, C -T Dean, Dijkstra, H, Dorigo, M, Dujany, G, Dziurda, A, Dzyuba, A, Eitschberger, U, I El Rifai, V Fernandez Albor, Ferro-Luzzi, M, Fol, P, Gandelman, M, Garrido, L, Gascon, D, Gaspar, C, Gazzoni, G, Geraci, A, Gershon, T, Granado Cardoso, L A, Graverini, E, Haefeli, G, Head, T, Hoballah, M, Joram, C, Khanji, B, Koopman, R F, Korolev, M, Kravchuk, L, Kruse, F, Kurek, K, Lambert, D, Lupton, O, Marchand, J F, Matev, R, Meier, F, Müller, K, Muster, B, Nandakumar, R, Neubert, S, Niess, V, Novoselov, A, Otto, A, Oyanguren, A, Papanestis, A, Pellegrino, A, M Pepe Altarelli, M Plo Casasus, Polycarpo, E, Potterat, C, Pugatch, V, Rademacker, J H, Rakotomiaramanana, B, Raniuk, I, Rihl, M, Rinnert, K, Robbe, P, P Ruiz Valls, Satta, A, Schiller, M, Seyfert, P, Shapkin, M, Shires, A, Sokoloff, M D, Souza, D, Souza De Paula, B, Spaan, B, Storaci, B, Thomas, E, Tobin, M, Viana Barbosa, J V, M Vieites Diaz, Vilasis-Cardona, X, Vorobyev, V, de Vries, J A, Watson, N K, Wiedner, D, Wishahi, J, Wormser, G, Zhong, L
• Format: Paper
• Language: English
• Published: Ithaca Cornell University Library, arXiv.org 26.05.2015
• Subjects: Angular momentum; Cross-sections; Energy measurement; Leptons; Luminosity; Transverse momentum; Uncertainty
• ISSN: 2331-8422
• DOI: 10.48550/arxiv.1503.00963

A measurement of the cross-section for Z-boson production in the forward region of pp collisions at 8TeV centre-of-mass energy is presented. The measurement is based on a sample of \(\rm Z\rightarrow e^+e^-\) decays reconstructed using the LHCb detector, corresponding to an integrated luminosity of 2.0fb\(^{-1}\). The acceptance is defined by the requirements \(2.0<\eta<4.5\) and \(p_{\rm T}>20\)GeV for the pseudorapidities and transverse momenta of the leptons. Their invariant mass is required to lie in the range 60--120GeV. The cross-section is determined to be $$ \sigma({\rm pp\to Z\to e^+e^-})=93.81\pm0.41({\rm stat})\pm1.48({\rm syst})\pm1.14({\rm lumi})\;{\rm pb}\,,$$ where the first uncertainty is statistical and the second reflects all systematic effects apart from that arising from the luminosity, which is given as the third uncertainty. Differential cross-sections are presented as functions of the Z-boson rapidity and of the angular variable \(\phi^*\), which is related to the Z-boson transverse momentum.