Observation of a narrow resonance at 10.02 GeV in e+e− annihilations

Bienlein, J. K.; Hörber, E.; Leissner, M.; Niczyporuk, B.; Rippich, C.; Schmitz, M.; Vogel, H.; Glawe, U.; Heimlich, F. H.; Lezoch, P.; Strohbusch, U.; Bock, P.; Heinzelmann, G.; Pietrzyk, B.; Blanar, G.; Blum, W.; Dietl, H.; Lorenz, E.; Richter, R.

doi:10.1016/0370-2693(78)90040-0

Cited by 116 publications

(11 citation statements)

References 12 publications

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“…As a result, charge and weak isospin of the b quark are well established quantities: Q b = − 1 3 and T 3 = − 1 2 . The charge Q b was first deduced from measurements of the cross section σ had for hadron production on the Υ resonance at the DORIS e + e − storage ring [27,28,29]. The integral over σ had is related to the leptonic width Γ ee of the Υ: σ had dM = 6 π 2 Γ ee /M 2 Υ (using the approximation that Γ had ≈ Γ total ).…”

Section: Model Predictions Of Top Quark Propertiesmentioning

confidence: 99%

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: Model Predictions Of Top Quark Propertiesmentioning

confidence: 99%

Top quark physics in hadron collisions

Wagner¹

2005

Rep. Prog. Phys.

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“…CFS then found the next member of the TI family, T(2S) [2]. The results were later confirmed at DORIS [3,4,5, 61 and CESR [7,8].…”

Section: Overviewmentioning

confidence: 74%

Measurement of the Ratio of Branching Ratios B($B^+ \to J/\psi \pi^+$) / B($B^+ \to J/\psi K^+$) and Search for $B_c^+$

Metzler

1996

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This thesis reports on a measurement of the branching ratio of the Cabibbo-suppressed decay B where J/-+ The data were collected by the Collider Detector at Fermilab during 1992-1995 and correspond to an integrated luminosity of 110 pb in pp collisions at = 1.8 TeV. A signal of 28t 0 events is observed and we determine the ratio of branching ratios B(B-* J/K) to be (5.0it ± 0.1)%, where the first uncertainties are statistical and the second are systematic. Using the world average value for B(B-+ J/ i/,K+), we calculate the branching ratio B(B-J/nrj to be (5.0t) x 10. We also search for the decay B J//,+ and report a 95% confidence level limit on a(B) B(B-+ J/rr)/a(B) B(B-+ J/'bK) as a function of the B lifetime.

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“…CLEO members carried on the Cornell legacy of collaboration by sharing collaboration management with other institutions and by making decisions in which each faculty member, postdoc, and graduate student voted with equal weight. By the time CESR operation began, a Fermilab group had discovered the ϒ system (47), and DORIS groups at DESY (48)(49)(50)(51) had demonstrated that two of the ϒ states were very narrow, suggesting the production of a new b quark. CLEO and CUSB quickly observed the first two narrow ϒ states and found a third (52,53), which had been suggested by a combination of DESY results with Fermilab data (54).…”

Section: Cleomentioning

confidence: 99%

Untitled

2015

Annu. Rev. Nucl. Part. Sci.

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This is the story of a culture and its evolution and legacy. Beginning with the invention of the cyclotron at Berkeley, the path of further accelerator development at Cornell via the Los Alamos experience of the primary actors is described. The science done with the accelerators and on the accelerators and beams themselves is reviewed and brought up to the current time. The evolution of the user community and the sources of support for accelerators and science done with them are discussed at the appropriate places in the story.

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Observation of a narrow resonance at 10.02 GeV in e+e− annihilations

Cited by 116 publications

References 12 publications

Top quark physics in hadron collisions

Top quark physics in hadron collisions

Measurement of the Ratio of Branching Ratios B($B^+ \to J/\psi \pi^+$) / B($B^+ \to J/\psi K^+$) and Search for $B_c^+$

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