Observation of a narrow resonance formed in e+e− annihilation at 9.46 GeV

Berger, Ch.; Lackas, W.; Raupach, F.; Wagner, W.; Alexander, G.; Criegee, L.; Dehne, H. C.; Derikum, K.; Devenish, R.C.E.; Flügge, G.; Franke, G.; Gerke, Ch.; Hackmack, E.; Harms, Philipp; Horlitz, G.; Kahl, Th.; Knies, G.; Lehmann, E.; Neumann, B.; Thompson, R. L.; Timm, U.; Waloschek, P.; Winter, G. G.; Wolff, S.; Zimmermann, W.; Achterberg, O.; Blobel, V.; Boesten, L.; Daumann, H.; Garfinkel, A. F.; Kapitza, H.; Koppitz, B.; Lührsen, W.; Maschuw, R.; Spitzer, H.; Staa, R. van; Wetjen, G.; Bäcker, A.; Burger, J. D.; Grupen, C.; Meyer, H.; Zech, G.; Daum, H. J.; Meyer, Olivier; Rößler, M.; Wacker, K.

doi:10.1016/0370-2693(78)90287-3

Cited by 196 publications

(11 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…There was evidence in the initial data of some excited states of the ground-state resonance. These were quickly confirmed at DESY in Hamburg, [11] where the DORIS storage ring energy was boosted to be able to produce the new states. Thus, the bottom quark came to be an accepted member of the hierarchy of quarks.…”

Section: A Brief History Of Heavy Quarks Today's Elementary Particlesmentioning

confidence: 85%

See 1 more Smart Citation

The experiment road to the heavier quarks and other heavy objects

Appel¹

2001

AIP Conference Proceedings

View full text Add to dashboard Cite

Abstract. After a brief history of heavy quarks, I will discuss charm, bottom, and top quarks in turn. For each one, I discuss its first observation, and then what we have learned about production, hadronization, and decays -and what these have taught us about the underlying physics. I will also point out remaining open issues. For this series of lectures, the charm quark will be emphasized. It is the first of the heavy quarks, and its study is where many of the techniques and issues first appeared. Only very brief mention is made of CP violation in the bottom-quark system since that topic is the subject of a separate series of lectures by Gabriel Lopez. As the three quarks are reviewed, a pattern of techniques and lessons emerges. These are identified, and then briefly considered in the context of anticipated physics signals of the future; e.g., for Higgs and SUSY particles. A BRIEF HISTORY OF HEAVY QUARKS Today's Elementary ParticlesToday's picture of the most elementary particles is composed of six quark types, six lepton types, and four force carriers. The quarks and leptons come in three generations, each generation with a pair of quarks (one with charge + 2/3, and one with charge -1/3) and a pair of leptons (one charged, and one neutral). See Table 1. The quarks and leptons have spin 1/2, and couple variously to the spin 1 force carriers: gluons, photons, and charged and neutral weak bosons (W + , W − , and Z). Unlike the leptons, the quarks appear to come in three varieties, called colors. Perhaps the number of colors is related to the quarks' third-integer charges. Also, quarks never appear in isolation, being permanently confined, for example, in meson and baryon combinations (quark-antiquark and three-quark combinations, respectively).These quark, lepton, and force-carrying particles are the foundation of the socalled Standard Model of particle physics. It is widely and completely accepted by the community. However, it was not always that way. The acceptance of the quark

show abstract

Section: A Brief History Of Heavy Quarks Today's Elementary Particlesmentioning

confidence: 85%

“…There, several experiments were able to offer rather quick confirmation of the discovery. [11] Because of the much better mass resolution based on beam energies at DORIS, the experimenters were able to discern three resonances, just where the Lederman group had said they were.…”

Section: Observations Of Bottom Quarksmentioning

confidence: 99%

The experiment road to the heavier quarks and other heavy objects

Appel¹

2001

AIP Conference Proceedings

View full text Add to dashboard Cite

show abstract

“…Here, T L 3 (b) and T R 3 (b) are the third components of the weak isospin for the left-handed and righthanded b-quark fields, respectively. The electric charge of the b-quark, e b = −1/3, has been well established from the Υ leptonic width as measured by the Doris e + e − experiment [37,38,39]. Therefore, measurements of the weak vector and axial-vector coupling of the b-quark, v b and a b , can be interpreted as measurements of its weak isospin.…”

Section: Indirect Evidence For the Existence Of The Top Quarkmentioning

confidence: 99%

Status and prospects of top-quark physics

Incandela

Quadt

Wagner

et al. 2009

Progress in Particle and Nuclear Physics

View full text Add to dashboard Cite

The top quark is the heaviest elementary particle observed to date. Its large mass of about 173 GeV/c 2 makes the top quark act differently than other elementary fermions, as it decays before it hadronises, passing its spin information on to its decay products. In addition, the top quark plays an important role in higher-order loop corrections to standard model processes, which makes the top quark mass a crucial parameter for precision tests of the electroweak theory. The top quark is also a powerful probe for new phenomena beyond the standard model. During the time of discovery at the Tevatron in 1995 only a few properties of the top quark could be measured. In recent years, since the start of Tevatron Run II, the field of top-quark physics has changed and entered a precision era. This report summarises the latest measurements and studies of top-quark properties and gives prospects for future measurements at the Large Hadron Collider (LHC).

show abstract

“…The cross section for the production and hadronic decay of the Υ(1S) resonance in e + e − collisions is proportional to the partial width of the Υ(1S) for decays to electrons, Γ ee , which can be related to the bottom-quark charge. The experimental results of the PLUTO collaboration from 1978 favored a charge of Q = −1/3 [33]. Measurements of the angular distribution of b hadrons produced in e + e − collision supported the quantum numbers I 3 = −1/2 and Q = −1/3 for the bottom quark [34], strongly suggesting that the bottom quark is the down-type quark of the third generation whose I 3 = +1/2 isospin partner was yet to be discovered.…”

Section: The Road To the Topmentioning

confidence: 99%

Top-quark physics: Status and prospects

Husemann

2017

Progress in Particle and Nuclear Physics

View full text Add to dashboard Cite

After the discovery of the top quark more than 20 years ago, its properties have been studied in great detail both in production and in decay. Increasingly sophisticated experimental results from the Fermilab Tevatron and from Run 1 and Run 2 of the LHC at CERN are complemented by very precise theoretical predictions in the framework of the standard model of particle physics and beyond. In this article the current status of top-quark physics is reviewed, focusing on experimental results, and a perspective of top-quark physics at the LHC and at future colliders is given.

show abstract

Observation of a narrow resonance formed in e+e− annihilation at 9.46 GeV

Cited by 196 publications

References 7 publications

The experiment road to the heavier quarks and other heavy objects

The experiment road to the heavier quarks and other heavy objects

Status and prospects of top-quark physics

Top-quark physics: Status and prospects

Contact Info

Product

Resources

About