A study of the Z production cross-section in pp collisions at √s = 7 using tau final states

A measurement of the inclusive Z → ττ cross-section in pp collisions at √s =7 is presented based on a dataset of 1.0 fb[superscript −1] collected by the LHCb detector. Candidates for Z → τ τ decays are identified through reconstructed final states with two muons, a muon and an electron, a muon and...

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Main Authors: Aaij, R., Beteta, C. A, Adametz, A., Adeva, B., Adinolfi, M., Adrover, C., Affolder, A., Ajaltouni, Z., Albrecht, J., Alessio, F., Alexander, M., Ali, S., Alkhazov, G., Cartelle, P. A, Alves, A. A, Amato, S., Amhis, Y., Anderlini, L., Anderson, J., Appleby, R. B, Gutierrez, O. A, Archilli, F., Artamonov, A., Artuso, M., Aslanides, E., Auriemma, G., Bachmann, S., Back, J. J, Baesso, C., Baldini, W., Barlow, R. J, Barschel, C., Barsuk, S., Barter, W., Bates, A., Bauer, Th., Bay, A., Beddow, J., Bediaga, I., Belogurov, S., Belous, K., Belyaev, I., Ben-Haim, E., Benayoun, M., Bencivenni, G., Benson, S., Benton, J., Berezhnoy, A., Bernet, R., Bettler, M.-O., van Beuzekom, M., Bien, A., Bifani, S., Bird, T., Bizzeti, A., Bjørnstad, P. M, Blake, T., Blanc, F., Blanks, C., Blouw, J., Blusk, S., Bobrov, A., Bocci, V., Bondar, A., Bondar, N., Bonivento, W., Borghi, S., Borgia, A., Bowcock, T. J V, Bozzi, C., Brambach, T., van den Brand, J., Bressieux, J., Brett, D., Britsch, M., Britton, T., Brook, N. H, Brown, H., Büchler-Germann, A., Burducea, I., Bursche, A., Buytaert, J., Cadeddu, S., Callot, O., Calvi, M., Gomez, M. C, Camboni, A., Campana, P., Carbone, A., Carboni, G., Cardinale, R., Cardini, A., Carranza-Mejia, H., Carson, L., Akiba, K. C, Casse, G., Cattaneo, M., Cauet, Ch., Charles, M., Charpentier, Ph., Chen, P., Chiapolini, N., Chrzaszcz, M., Ciba, K., Vidal, X. C, Ciezarek, G., Clarke, P. E L, Clemencic, M., Cliff, H. V, Closier, J., Coca, C., Coco, V., Cogan, J., Cogneras, E., Collins, P., Comerma-Montells, A., Contu, A., Cook, A., Coombes, M., Corti, G., Couturier, B., Cowan, G. A, Craik, D., Cunliffe, S., Currie, R., D’Ambrosio, C., David, P., De Bonis, I., De Bruyn, K., De Capua, S., De Cian, M., De Miranda, J. M, De Paula, L., De Simone, P., Decamp, D., Deckenhoff, M., Degaudenzi, H., Del Buono, L., Deplano, C., Derkach, D., Deschamps, O., Dettori, F., Di Canto, A., Dickens, J., Dijkstra, H., Batista, P. D, Dogaru, M., Bonal, F. D, Donleavy, S., Dordei, F., Suárez, A. D, Dossett, D., Dovbnya, A., Dupertuis, F., Dzhelyadin, R., Dziurda, A., Dzyuba, A., Easo, S., Egede, U., Egorychev, V., Eidelman, S., van Eijk, D., Eisenhardt, S., Ekelhof, R., Eklund, L., El Rifai, I., Elsasser, Ch., Elsby, D., Falabella, A., Färber, C., Fardell, G., Farinelli, C., Farry, S., Fave, V., Albor, V. F, Rodrigues, F. F, Ferro-Luzzi, M., Filippov, S., Fitzpatrick, C., Fontana, M., Fontanelli, F., Forty, R., Francisco, O., Frank, M., Frei, C., Frosini, M., Furcas, S., Torreira, A. G, Galli, D., Gandelman, M., Gandini, P., Gao, Y., Garnier, J-C., Garofoli, J., Garosi, P., Tico, J. G, Garrido, L., Gaspar, C., Gauld, R., Gersabeck, E., Gersabeck, M., Gershon, T., Ghez, Ph., Gibson, V., Gligorov, V. V, Göbel, C., Golubkov, D., Golutvin, A., Gomes, A., Gordon, H., Gándara, M. G, Diaz, R. G, Cardoso, L. A G, Graugés, E., Graziani, G., Grecu, A., Greening, E., Gregson, S., Grünberg, O., Gui, B., Gushchin, E., Guz, Yu., Gys, T., Hadjivasiliou, C., Haefeli, G., Haen, C., Haines, S. C, Hall, S., Hampson, T., Hansmann-Menzemer, S., Harnew, N., Harnew, S. T, Harrison, J., Harrison, P. F, Hartmann, T., He, J., Heijne, V., Hennessy, K., Henrard, P., Morata, J. A H, van Herwijnen, E., Hicks, E., Hill, D., Hoballah, M., Hopchev, P., Hulsbergen, W., Hunt, P., Huse, T., Hussain, N., Hutchcroft, D., Hynds, D., Iakovenko, V., Ilten, P., Imong, J., Jacobsson, R., Jaeger, A., Hussein, M. J, Jans, E., Jansen, F., Jaton, P., Jean-Marie, B., Jing, F., John, M., Johnson, D., Jones, C. R, Jost, B., Kaballo, M., Kandybei, S., Karacson, M., Karbach, T. M, Kenyon, I. R, Kerzel, U., Ketel, T., Keune, A., Khanji, B., Kim, Y. M, Kochebina, O., Komarov, V., Koopman, R. F, Koppenburg, P., Korolev, M., Kozlinskiy, A., Kravchuk, L., Kreplin, K., Kreps, M., Krocker, G., Krokovny, P., Kruse, F., Kucharczyk, M., Kudryavtsev, V., Kvaratskheliya, T., La Thi, V. N, Lacarrere, D., Lafferty, G., Lai, A., Lambert, D., Lambert, R. W, Lanciotti, E., Lanfranchi, G., Langenbruch, C., Latham, T., Lazzeroni, C., Le Gac, R., van Leerdam, J., Lees, J.-P., Lefèvre, R., Leflat, A., Lefrançois, J., Leroy, O., Lesiak, T., Li, Y., Gioi, L. L, Liles, M., Lindner, R., Linn, C., Liu, B., Liu, G., von Loeben, J., Lopes, J. H, Asamar, E. L, Lopez-March, N., Lu, H., Luisier, J., Luo, H., Raighne, A. M, Machefert, F., Machikhiliyan, I. V, Maciuc, F., Maev, O., Magnin, J., Maino, M., Malde, S., Manca, G., Mancinelli, G., Mangiafave, N., Marconi, U., Märki, R., Marks, J., Martellotti, G., Martens, A., Martin, L., Sánchez, A. M, Martinelli, M., Santos, D. M, Tostes, D. M, Massafferri, A., Matev, R., Mathe, Z., Matteuzzi, C., Matveev, M., Maurice, E., Mazurov, A., McCarthy, J., McGregor, G., McNulty, R., Meissner, M., Merk, M., Merkel, J., Milanes, D. A, Minard, M.-N., Rodriguez, J. M, Monteil, S., Moran, D., Morawski, P., Mountain, R., Mous, I., Muheim, F., Müller, K., Muresan, R., Muryn, B., Muster, B., Mylroie-Smith, J., Naik, P., Nakada, T., Nandakumar, R., Nasteva, I., Needham, M., Neufeld, N., Nguyen, A. D, Nguyen, T. D, Nguyen-Mau, C., Nicol, M., Niess, V., Nikitin, N., Nikodem, T., Nomerotski, A., Novoselov, A., Oblakowska-Mucha, A., Obraztsov, V., Oggero, S., Ogilvy, S., Okhrimenko, O., Oldeman, R., Orlandea, M., Goicochea, J. M O, Owen, P., Pal, B. K, Palano, A., Palutan, M., Panman, J., Papanestis, A., Pappagallo, M., Parkes, C., Parkinson, C. J, Passaleva, G., Patel, G. D, Patel, M., Patrick, G. N, Patrignani, C., Pavel-Nicorescu, C., Alvarez, A. P, Pellegrino, A., Penso, G., Altarelli, M. P, Perazzini, S., Perego, D. L, Trigo, E. P, Yzquierdo, A. P, Perret, P., Perrin-Terrin, M., Pessina, G., Petridis, K., Petrolini, A., Phan, A., Olloqui, E. P, Valls, B. P, Pietrzyk, B., Pilař, T., Pinci, D., Playfer, S., Casasus, M. P, Polci, F., Polok, G., Poluektov, A., Polycarpo, E., Popov, D., Popovici, B., Potterat, C., Powell, A., Prisciandaro, J., Pugatch, V., Navarro, A. P, Qian, W., Rademacker, J. H, Rakotomiaramanana, B., Rangel, M. S, Raniuk, I., Rauschmayr, N., Raven, G., Redford, S., Reid, M. M, dos Reis, A. C, Ricciardi, S., Richards, A., Rinnert, K., Molina, V. R, Romero, D. A R, Robbe, P., Rodrigues, E., Perez, P. R, Rogers, G. J, Roiser, S., Romanovsky, V., Vidal, A. R, Rouvinet, J., Ruf, T., Ruiz, H., Sabatino, G., Silva, J. J S, Sagidova, N., Sail, P., Saitta, B., Salzmann, C., Sedes, B. S, Sannino, M., Santacesaria, R., Rios, C. S, Santinelli, R., Santovetti, E., Sapunov, M., Sarti, A., Satriano, C., Satta, A., Savrie, M., Schaack, P., Schiller, M., Schindler, H., Schleich, S., Schlupp, M., Schmelling, M., Schmidt, B., Schneider, O., Schopper, A., Schune, M.-H., Schwemmer, R., Sciascia, B., Sciubba, A., Seco, M., Semennikov, A., Senderowska, K., Sepp, I., Serra, N., Serrano, J., Seyfert, P., Shapkin, M., Shapoval, I., Shatalov, P., Shcheglov, Y., Shears, T., Shekhtman, L., Shevchenko, O., Shevchenko, V., Shires, A., Coutinho, R. S, Skwarnicki, T., Smith, N. A, Smith, E., Smith, M., Sobczak, K., Soler, F. J P, Soomro, F., Souza, D., De Paula, B. S, Spaan, B., Sparkes, A., Spradlin, P., Stagni, F., Stahl, S., Steinkamp, O., Stoica, S., Stone, S., Storaci, B., Straticiuc, M., Straumann, U., Subbiah, V. K, Swientek, S., Szczekowski, M., Szczypka, P., Szumlak, T., T’Jampens, S., Teklishyn, M., Teodorescu, E., Teubert, F., Thomas, C., Thomas, E., van Tilburg, J., Tisserand, V., Tobin, M., Tolk, S., Tonelli, D., Topp-Joergensen, S., Torr, N., Tournefier, E., Tourneur, S., Tran, M. T, Tsaregorodtsev, A., Tsopelas, P., Tuning, N., Garcia, M. U, Ukleja, A., Urner, D., Uwer, U., Vagnoni, V., Valenti, G., Gomez, R. V, Regueiro, P. V, Vecchi, S., Velthuis, J. J, Veltri, M., Veneziano, G., Vesterinen, M., Viaud, B., Videau, I., Vieira, D., Vilasis-Cardona, X., Visniakov, J., Vollhardt, A., Volyanskyy, D., Voong, D., Vorobyev, A., Vorobyev, V., Voß, C., Voss, H., Waldi, R., Wallace, R., Wandernoth, S., Wang, J., Ward, D. R, Watson, N. K, Webber, A. D, Websdale, D., Whitehead, M., Wicht, J., Wiedner, D., Wiggers, L., Wilkinson, G., Williams, M. P, Wilson, F. F, Wishahi, J., Witek, M., Witzeling, W., Wotton, S. A, Wright, S., Wu, S., Wyllie, K., Xie, Y., Xing, F., Xing, Z., Yang, Z., Young, R., Yuan, X., Yushchenko, O., Zangoli, M., Zavertyaev, M., Zhang, F., Zhang, L., Zhang, W. C, Zhang, Y., Zhelezov, A., Zhong, L., Zvyagin, A., Williams, Michael
Other Authors: Massachusetts Institute of Technology. Department of Physics
Format: Article
Language:English
Published: Springer-Verlag 2017
Online Access:http://hdl.handle.net/1721.1/109831
https://orcid.org/0000-0001-8285-3346
Description
Summary:A measurement of the inclusive Z → ττ cross-section in pp collisions at √s =7 is presented based on a dataset of 1.0 fb[superscript −1] collected by the LHCb detector. Candidates for Z → τ τ decays are identified through reconstructed final states with two muons, a muon and an electron, a muon and a hadron, or an electron and a hadron. The production cross-section for Z bosons, with invariant mass between 60 and 120 GeV/c[superscript 2], which decay to τ leptons with transverse momenta greater than 20 GeV/c and pseudorapidities between 2.0 and 4.5, is measured to be σ[subscript pp]→Z→ττ = 71.4 ± 3.5 ± 2.8 ± 2.5 pb; the first uncertainty is statistical, the second is systematic, and the third is due to the uncertainty on the integrated luminosity. The ratio of the cross-sections for Z → τ τ to Z → μμ is determined to be 0.93 ± 0.09, where the uncertainty is the combination of statistical, systematic, and luminosity uncertainties of the two measurements.