1. A precision measurement of the mass of the top quark
- Author
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Abazov, V.M., Abbott, B., Abdesselam, Abdelmalek, Abolins, M., Abramov, V., Acharya, B.S., Adams, D.L., Adams, M., Ahmed, S.N., Alexeev, G.D., Alton, A., Alves, G.A., Arnoud, Y., Avila, C., Babintsev, V.V., Babukhadia, L., Bacon, T.C., Baden, A., Baffioni, S., Baldin, B., Balm, P.W., Banerjee, S., Barberis, E., Baringer, P., Barreto, J., Bartlett, J.F., Bassler, U., Bauer, D., Bean, A., Beaudette, F., Begel, M., Belyaev, A., Beri, S.B., Bernardi, G., Bertram, I., Besson, A., Beuselinck, R., Bezzubov, V.A., Bhat, P.C., Bhatnagar, V., Bhattacharjee, M., Blazey, G., Blekman, F., Blessing, S., Boehnlein, A., Bojko, N.I., Bolton, T.A., Borcherding, F., Bos, K., Bose, T., Brandt, A., Briskin, G., Brock, R., Brooijmans, G., Bross, A., Buchholz, D., Buehler, M., Buescher, V., Burtovoi, V.S., Butler, J.M., Canelli, F., Carvalho, W., Casey, D., Castilla-Valdez, H., Chakraborty, D., Chan, K.M., Chekulaev, S.V., Cho, D.K., Choi, S., Chopra, S., Claes, D., Clark, A.R., Connolly, B., Cooper, W.E., Coppage, D., Crepe-Renaudin, S., Cummings, M.A.C., Cutts, D., Motta, H.Da., Davis, G.A., De, K., Jong, S.J. De., Demarteau, M., Demina, R., Demine, P., Denisov, D., Denisov, S.P., Desai, S., Diehl, H.T., Diesburg, M., Doulas, S., Dudko, L.V., Duflot, L., Dugad, S.R., Duperrin, A., Dyshkant, A., Edmunds, D., Ellison, J., Eltzroth, J.T., Elvira, V.D., Engelmann, R., Eno, S., Eppley, G., Ermolov, P., Eroshin, O.V., Estrada, J., Evans, H., Evdokimov, V.N., Ferbel, T., Filthaut, F., Fisk, H.E., Fortner, M., Fox, H., Fu, S., Fuess, S., Gallas, E., Galyaev, A.N., Gao, M., Gavrilov, V., Genik II, R.J., Genser, K., Gerber, C.E., Gershtein, Y., Ginther, G., Gomez, B., Goncharov, P.I., Gounder, K., Goussiou, A., Grannis, P.D., Greenlee, H., Greenwood, Z.D., Grinstein, S., Groer, L., Grunendahl, S., Grunewald, M.W., Gurzhiev, S.N., Gutierrez, G., Gutierrez, P., Hadley, N.J., Haggerty, H., Hagopian, S., Hagopian, V., Hall, R.E., Han, C., Hansen, Scott, Hauptman, J.M., Hebert, Christian, Hedin, D., Heinmiller, J.M., Heinson, A.P., Heintz, U., Hildreth, M.D., Hirosky, R., Hobbs, J.D., Hoeneisen, B., Huang, J., Huang, Yue, Iashvili, I., Illingworth, R., Ito, A.S., Jaffre, M., Jain, S., Jesik, R., Johns, K., Johnson, M., Jonckheere, A., Jostlein, H., Juste, A., Kahl, W., Kahn, S., Kajfasz, E., Kalinin, A.M., Karmanov, D., Karmgard, D., Kehoe, R., Kesisoglou, S., Khanov, A., Kharchilava, A., Klima, B., Kohli, J.M., Kostritskiy, A.V., Kotcher, J., Kothari, B., Kozelov, A.V., Kozlovsky, E.A., Krane, J., Krishnaswamy, M.R., Krivkova, P., Krzywdzinski, S., Kubantsev, M., Kuleshov, S., Kulik, Y., Kunori, S., Kupco, A., Kuznetsov, V.E., Landsberg, G., Lee, W.M., Leflat, A., Lehner, F., Leonidopoulos, C., Li, J., Li, Q.Z., Lima, J.G.R., Lincoln, D., Linn, S.L., Linnemann, J., Lipton, R., Lucotte, A., Lueking, L., Lundstedt, C., Luo, C., Maciel, A.K.A., Madaras, R.J., Malyshev, V.L., Manankov, V., Mao, H.S., Marshall, T., Martin, M.I., Mattingly, S.E.K., Mayorov, A.A., McCarthy, R., McMahon, T., Melanson, H.L., Melnitchouk, A., Merkin, A., Merritt, K.W., Miao, C., Miettinen, H., Mihalcea, D., Mokhov, N., Mondal, N.K., Montgomery, H.E., Moore, R.W., Mutaf, Y.D., Nagy, E., Narain, M., Narasimham, V.S., Naumann, N.A., Neal, H.A., Negret, J.P., Nelson, S., Nomerotski, A., Nunnemann, T., O'Neil, D., Oguri, V., Oshima, N., Padley, P., Papageorgiou, K., Parashar, N., Partridge, R., Parua, N., Patwa, A., Peters, O., Petroff, P., Piegaia, R., Pope, B.G., Prosper, H.B., Protopopescu, S., Przybycien, M.B., Qian, J., Rajagopalan, S., Rapidis, P.A., Reay, N.W., Reucroft, S., Ridel, M., Rijssenbeek, M., Rizatdinova, F., Rockwell, T., Royon, C., Rubinov, P., Ruchti, R., Sabirov, B.M., Sajot, G., Santoro, A., Sawyer, L., Schamberger, R.D., Schellman, H., Schwartzman, A., Shabalina, E., Shivpuri, R.K., Shpakov, D., Shupe, M., Sidwell, R.A., Simak, V., Sirotenko, V., Slattery, P., Smith, R.P., Snow, G.R., Snow, J., Snyder, S., Solomon, J., Song, Y., Sorin, V., Sosebee, M., Sotnikova, N., Soustruznik, K., Souza, M., Stanton, N.R., Steinbruck, G., Stoker, D., Stolin, V., Stone, A., Stoyanova, D.A., Strang, M.A., Strauss, M., Strovink, M., Stutte, L., Sznajder, A., Talby, M., Taylor, W., Tentindo-Repond, S., Trippe, T.G., Turcot, A.S., Tuts, P.M., Kooten, R. Van., Vaniev, V., Varelas, N., Villeneuve-Seguier, F., Volkov, A.A., Vorobiev, A.P., Wahl, H.D., Wang, Z.-M., Warchol, J., Watts, G., Wayne, M., Weerts, H., White, A., Whiteson, D., Wijngaarden, D.A., Willis, S., Wimpenny, S.J., Womersley, J., Wood, D.R., Xu, Q., Yamada, R., Yasuda, T., Yatsunenko, Y.A., Yip, K., Yu, J., Zanabria, M., Zhang, X., Zhou, B., Zhou, Z., Zielinski, M., Zieminska, D., Zieminski, A., Zutshi, V., Zverev, E.G., Zylberstejn, A., Laboratoire de l'Accélérateur Linéaire (LAL), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS), Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), D0, Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS), and D0 (Tevatron, IHEF, IOP, FNWI)
- Subjects
Quark ,Particle physics ,Top quark ,FOS: Physical sciences ,01 natural sciences ,High Energy Physics - Experiment ,Standard Model ,Nuclear physics ,High Energy Physics - Experiment (hep-ex) ,High Energy Physics - Phenomenology (hep-ph) ,0103 physical sciences ,[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex] ,Limit (mathematics) ,010306 general physics ,Physics ,Multidisciplinary ,010308 nuclear & particles physics ,High Energy Physics::Phenomenology ,Top quark condensate ,3. Good health ,High Energy Physics - Phenomenology ,Pair production ,Experimental High Energy Physics ,ComputingMethodologies_DOCUMENTANDTEXTPROCESSING ,Higgs boson ,High Energy Physics::Experiment ,Event (particle physics) - Abstract
The Standard Model of particle physics contains about two dozen parameters - such as particle masses - whose origins are still unknown and cannot be predicted, but whose values are constrained through their interactions. In particular, the masses of the top (t) quark (M_t) and W boson constrain the mass of the long-hypothesized, but thus far not observed, Higgs boson. A precise measurement of the top-quark mass can therefore point to where to look for the Higgs, and indeed whether the hypothesis of a SM Higgs is consistent with experimental data. Since top quarks are produced in pairs and decay in only ~10^-24 s into various final states, reconstructing their mass from their decay products is very challenging. Here we report a technique that extracts far more information from each top-quark event and yields a greatly improved precision on the top mass of 5.3 GeV/c^2, compared to previous measurements. When our new result is combined with our published measurement in a complementary decay mode and with the only other measurements available, the new world average for M_t becomes 178.0 +- 4.3 GeV/c^2. As a result, the most likely Higgs mass increases from the experimentally excluded value of 96 GeV/c^2 to 117 GeV/c^2, which is beyond current experimental sensitivity. The upper limit on the Higgs mass at 95% confidence level is raised from 219 GeV/c^2 to 251 GeV/c^2., Comment: For high-resolution version of figures, the article, as appeared in Nature, and related News & Views, see http://www-d0.fnal.gov/Run2Physics/top/public/public.html (8 pages, 4 color figures)
- Published
- 2004