Perspectives of massification policy in higher education of Azerbaijan : challenges and opportunities

Ahmadov, Tofig

doi:10.5353/th_b5703723

Cited by 4 publications

(7 citation statements)

References 45 publications

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“…The aim of Run II at the Tevatron is to reach a total uncertainty of 2 to 3 GeV/c 2 on M top . At the LHC the top mass will be measured with negligible statistical uncertainty, while the systematic uncertainty is predicted to be on the order of 1 GeV/c 2 towards the end of the running period [5]. In this precision regime the concrete definition of the top quark mass becomes relevant.…”

Section: Future Prospectsmentioning

confidence: 99%

“…These limits are still far from the interesting region. At the LHC experiments will reach a sensitivity level of 10 −4 [5], and thereby reach a region where some models predicting very large enhancements can be excluded [305].…”

Section: Fcnc Decaysmentioning

confidence: 99%

“…In chapter 9 we discuss the search for anomalous (non SM) top quark production. Previous reviews of top quark physics can be found in references [3,4,5,6,7,8,9].…”

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confidence: 99%

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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: Future Prospectsmentioning

confidence: 99%

Section: Fcnc Decaysmentioning

confidence: 99%

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Top quark physics in hadron collisions

Wagner¹

2005

Rep. Prog. Phys.

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“…The single top events are produced in s, t and tW channels. A comprehensive review of the top quark physics including a description of single top events can be found in [19]. The D0 [20] and CDF [21] were the first collaborations which announced observation of single top events .…”

Section: Light and Heavy Charged Higgs Bosons Produced In Single Top mentioning

confidence: 99%

Observability of heavy charged Higgs through s-channel single top events at LHC

Hashemi

2013

J. High Energ. Phys.

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The charged Higgs bosons can be produced as a resonance in s-channel single top events. The light charged Higgs in such events preferably decays to a pair of τ ν thus making it difficult to distinguish from the large single W events producing the same final state. However, the heavy charged Higgs decay to a pair of tb can be extracted from the SM background events. The final state under consideration in this paper contains the top quark decay to W + b followed by W + decay to electrons or muons. It is shown that this signal can be observed at LHC at a large area of MSSM phase space (m(H ± ), tan β). Finally 5σ and 95% CL exclusion contours are presented at different integrated luminosities of LHC assuming a nominal center of mass energy of √ s = 14 TeV.

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“…Due to the low cross section of single top events at Tevatron, a detailed study of its properties was made available when a large amount of data was finally collected. However, the cross sections of this process at LHC in three s, t and tW channels are as large as 10.5, 247 and 51 pb [18]. Since the t-channel single top has a large cross section (almost one third of tt cross section), it can be used as the main single top channel for different studies, one of which could be search for light charged Higgs bosons through the subsequent decay t → H + b.…”

Section: Single Top Events As a Source Of Charged Higgs Bosonsmentioning

confidence: 99%

Single top events as a source of light charged Higgs in the fully hadronic final state at LHC

Hashemi

2013

J. High Energ. Phys.

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The single top production proceeds through different channels at LHC. The t-channel production which has a cross section at the level of one third of the tt, can be regarded as a source of light charged Higgs boson through top quark decay to charged Higgs. Due to the low jet multiplicity and characteristic kinematic features of this process, a signal selection can be designed to extract charged Higgs signal from the background processes. In this paper, taking MSSM as the theoretical framework, The light charged Higgs signal from single top events is analyzed. The charged Higgs is assumed to decay to τ ν and the hadronic decay of τ leptons is analyzed. Different charged Higgs mass hypotheses are analyzed and a scan over the parameter space (m H ± , tanβ) is performed. It is shown that this process has the potential to exclude large areas of parameter space, while with enough data, a 5σ discovery would also be possible. Finally 95% C.L. exclusion and 5σ contours are provided for different integrated luminosities of LHC.

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Perspectives of massification policy in higher education of Azerbaijan : challenges and opportunities

Cited by 4 publications

References 45 publications

Top quark physics in hadron collisions

Top quark physics in hadron collisions

Observability of heavy charged Higgs through s-channel single top events at LHC

Single top events as a source of light charged Higgs in the fully hadronic final state at LHC

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