New particle searches

Adeva, B.; Becker, U.; Becker‐Szendy, R.; Berdugo, J.; Böhm, A.; Branson, J. G.; Burger, J. D.; Capell, M.; Cerrada, M.; Chang, C. C.; Chang, Y. H.; Chen, H. S.; Chen, Min; Chen, M. L.; Chen, M. Y.; Deffur, E.; Demarteau, M.; Dong, B.; Duinker, P.; Fesefeldt, H.; Fong, D. G.; Fukushima, M.; Garrido, Ll.; Han, Ruixiong; Harting, D.; Herten, G.; Ho, M. C.; Huser, D.; Hussain, Mehdi; Ilyas, M. M.; Jiang, D. Z.; Krenz, W.; Kuijer, P. G.; Li, Q. Z.; Linnhöfer, D.; Luckey, D.; Luit, E. J.; Mañá, C.; Marquina, M. A.; Martı́nez, M.; Massaro, G.; Mnich, J.; Mount, R.; Nadeem, K.; Newman, H. B.; Pohl, M.; Poschmann, F. P.; Rau, R. R.; Rodŕıguez, S. Consuegra; Rohde, M.; Rubio, J. A.; Rykaczewski, H.; Salicio, J.; Schröder, Udo; Stone, Howard A.; Swider, G. M.; Tang, H. W.; Teuchert, D.; Samuel, C C Ting; Tung, K. L.; Wang, M. Q.; White, M. J.; Wu, Huifang; Wu, S. X.; Wysłouch, B.; Yang, Bo; Zhou, B.; Zhu, R. Y.

doi:10.1016/0370-2693(85)90524-6

Cited by 63 publications

(3 citation statements)

References 41 publications

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“…Between 1979 and 1984 the five experiments at the PETRA collider, CELLO, JADE, MARK J, PLUTO, and TASSO, measured R at several centre-of-mass energies ranging from 12 to 46.8 GeV in steps of about 20 to 30 MeV [183,184,185,186,187]. No indication of top quark production was found.…”

Section: Early Searchesmentioning

confidence: 99%

“…figure shows the lower experimental limits on the top quark mass (histogram) [186,210,211,185,212,195,198,201,203], theoretical predictions mainly based on flavour symmetries within the quark mass matrix (dots) [182,213,214,215,216,217,218] and predictions based on electroweak precision measurements at LEP and SLC (squares) [219,220,221,48,222,223] as discussed in section 2.3. The direct measurements by CDF [204,205,224,104] and DØ [207,225,226,106] are also included (triangles).…”

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Top quark physics in hadron collisions

Wagner¹

2005

Rep. Prog. Phys.

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The top quark is the heaviest elementary particle observed to date. Its large mass makes the top quark an ideal laboratory to test predictions of perturbation theory concerning heavy quark production at hadron colliders. The top quark is also a powerful probe for new phenomena beyond the Standard Model of particle physics. In addition, the top quark mass is a crucial parameter for scrutinizing the Standard Model in electroweak precision tests and for predicting the mass of the yet unobserved Higgs boson. Ten years after the discovery of the top quark at the Fermilab Tevatron top quark physics has entered an era where detailed measurements of top quark properties are undertaken. In this review article an introduction to the phenomenology of top quark production in hadron collisions is given, the lessons learned in Tevatron Run I are summarized, and first Run II results are discussed. A brief outlook to the possibilities of top quark research a the Large Hadron Collider, currently under construction at CERN, is included.PACS numbers: 14.65.Ha Summary and outlook 79Top quark physics in hadron collisions 4 IntroductionThe top quark is the by far heaviest of the six fundamental fermions in the Standard Model (SM) of particle physics. Its large mass made the search for the top quark a long and tedious process, since accelerators with high centre-of-mass energies are needed. In 1977 the discovery of the bottom quark indicated the existence of a third quark generation, and shortly thereafter the quest for the top quark began. Searches were conducted in electron-positron (e + e − ) and protonantiproton (pp) collisions during the 1980s and early 1990s. Finally, in 1995 the top quark was discovered at the Fermilab Tevatron pp collider. Subsequently, its mass was precisely measured to be M top = (178.0 ± 4.3) GeV/c 2 [1]. The relative precision of this measurement (2.4%) is better than our knowledge of any other quark mass. The top quark is about 40 times heavier than the second-heaviest quark, the bottom quark. Its huge mass makes the top quark an ideal probe for new physics beyond the SM.It remains an open question to particle physics research whether the observed mass hierarchy is a result of unknown fundamental particle dynamics. It has been argued that the top quark could be the key to understand the dynamical origin of how particle masses are generated by the mechanism of electroweak symmetry breaking, since its mass is close to the energy scale at which the break down occurs (vacuum expectation value of the Higgs field = 246 GeV) [2]. The most favoured framework to describe electroweak symmetry breaking is the Higgs mechanism. The masses of the Higgs boson, the W boson and the top quark are closely related through higher order corrections to various physics processes. A precise knowledge of the top quark mass together with other electroweak precision measurements can therefore be used to predict the Higgs boson mass. At present, top quarks can only be directly produced at the Tevatron. The physics results of the Tevat...

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Section: Early Searchesmentioning

confidence: 99%

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confidence: 99%

Top quark physics in hadron collisions

Wagner¹

2005

Rep. Prog. Phys.

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“…First searches for a top quark were conducted at e + e − colliders and the lower mass limit on the top quark mass could be increased in the years between 1979 and 1990 from m t > 23.3 GeV/c 2 [17][18][19][20] measured at Petra (DESY, centre-of-mass energy √ s = 12 − 46.8 GeV), to m t > 30.2 GeV/c 2 [21][22][23] at Tristan (KEK, √ s = 50 − 61.4, GeV) and finally to m t > 45.8 GeV/c 2 [24][25][26][27] at LEP I (CERN, √ s = M Z ) and SLC (SLAC, √ s = M Z ). Parallel to the searches at the e + e − -colliders the top-quark has been searched for at the first proton anti-proton collider SppS (CERN, √ s = 546 − 630 GeV).…”

Section: Introductionmentioning

confidence: 99%

Experimental Studies of Top Quark Production

Wagner-Kuhr

2016

Preprint

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In this review article three promising aspects of top quark production are discussed: the charge asymmetry in top quark pair production, the search for resonant top quark pair production, and electroweak single top quark production. First, an overview of the theoretical predictions of top quark pair and single top quark production is given. Then, for each topic the general analysis strategy and improvements are exemplarily explained using selected analyses and are put into the context of the global status at the beginning of LHC Run II and progress in this field. The example analyses discussed in more detail in this article use data from the LHC experiment CMS and for the charge asymmetry studies also data from the Tevatron experiment CDF have been used.

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The Superstring-Inspired Generalizations of the Glashow-Weinberg-Salam Model

Sładkowski

1990

Fortschr. Phys.

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New particle searches

Cited by 63 publications

References 41 publications

Top quark physics in hadron collisions

Top quark physics in hadron collisions

Experimental Studies of Top Quark Production

The Superstring-Inspired Generalizations of the Glashow-Weinberg-Salam Model

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