Implications of high precision experiments and the CDF top quark candidates

Erler, Jens; Langacker, Paul

doi:10.1103/physrevd.52.441

Cited by 72 publications

(88 citation statements)

References 78 publications

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“…Finally the γγ luminosities are so high that it is not out of the question to search for particles beyond the standard model, especially light Higgs particles, new leptons, or SUSY sleptons [130][131][132], produced in a relatively clean environment. Higgs decays into pairs are a candidate for study.…”

Section: Overviewmentioning

confidence: 99%

A full-acceptance detector at the LHC (FELIX)

Ageev¹,

Akhobadze²,

Alvero³

et al. 2002

J. Phys. G: Nucl. Part. Phys.

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The FELIX collaboration had proposed the construction of a full-acceptance detector for the LHC. The primary mission of FELIX was the study of QCD: to provide comprehensive and definitive observations of a very broad range of strong-interaction processes. This document contains an extensive discussion of this physics menu. In a further paper the FELIX detector will be reviewed. Contents HISTORYWith the advent of the large hadron collider (LHC), we are on the threshold of a new era in high-energy physics. With instrumentation in the form of dedicated experiments of unprecedented precision and complexity, the LHC will move significantly beyond the current high-energy frontier, and dramatically improve our understanding of particle physics at the highest energies and shortest distances accessible to man.As currently planned, however, the LHC experimental programme is incomplete. Moreover, these deficiencies continue and extend what has been a gap in the experimental programme of all hadron colliders. The problem lies in the design of the detectors instrumenting hadron colliders: they are all optimized for rare, high-pt events. These 'general purpose' detectors are anything but that. Rather, they are designed to explore extreme shortdistance phenomena. Without intending to demean the efforts of the collaborations which have built or are building these detectors, it is nevertheless these events in which the theorists are most confident that they understand the physics, and are in many ways experimentally most accessible.While there is no doubt that such physics and such detectors should be the centrepiece of any programme of hadron collider physics, it seems much less clear that they should be the only item on the agenda. Indeed, it can be argued that a full-acceptance detector, capable of detecting and measuring each particle in an event well, may have the greatest discovery potential. Alas, the absence of any experimental effort in this direction in the collider era has meant that both theoretical investigations and experimental design of such detectors has languished, to the point that many in the community have come to think of high-pt physics as the last frontier in particle physics.The FELIX collaboration sought to rectify this situation. With support from the CERN administration, some 160 physicists collaborated in preparing the FELIX LoI. Many of these could not officially join the collaboration, and so their help could only be acknowledged. While the FELIX proposal was never officially killed, it was nevertheless effectively killed without the collaboration making a formal presentation to the LHC committee.All of this, of course, is history, and not very pleasant history at that. The motivation for a full-acceptance detector remains, however, and interest on the part of the broader community, despite the implications of this history, remains high. Because of this, the FELIX collaboration, together with those who helped but were not members, believes that it is important to document the physics of a ...

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Section: Overviewmentioning

confidence: 99%

A full-acceptance detector at the LHC (FELIX)

Ageev¹,

Akhobadze²,

Alvero³

et al. 2002

J. Phys. G: Nucl. Part. Phys.

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“…3 The classic example is the global fit of the parameters of the Standard Model to electroweak precision measurements [47]. However, the notion that such an approach can be used to distinguish classes of models has not to our knowledge been pursued.…”

Section: Global Theoretical Fitsmentioning

confidence: 99%

Relating incomplete data and incomplete theory

et al. 2004

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Assuming string theorists will not soon provide a compelling case for the primary theory underlying particle physics, the field will proceed as it has historically: with data stimulating and testing ideas. Ideally the soft supersymmetry breaking Lagrangian will be measured and its patterns will point to the underlying theory. But there are two new problems. First a matter of principle: the theory may be simplest at distance scales and in numbers of dimensions where direct experiments are not possible. Second a practical problem: in the foreseeable future (with mainly hadron collider data) too few observables can be measured to lead to direct connections between experiment and theory. In this paper we discuss and study these issues and consider ways to circumvent the problems, studying models to test methods. We propose a semi-quantitative method for focusing and sharpening thinking when trying to relate incomplete data to incomplete theory, as will probably be necessary.

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“…Table I for representative values of M t and M N 1 in GeV. For each pair of values we list the mean value of the superweight, the expected number of events in 100 pb −1 (based upon the entries in Table III), the expected number of events with a superweight of 6 (7,8) or greater in 100 pb −1 . No K factor is included: see the discussion at the beginning of Sec.…”

Section: Fig 10mentioning

confidence: 99%

“…IV. (based upon the entries in Table II), the number of events with a superweight of 6 (7,8) or greater in 100 pb −1 . The bottom line gives the totals, or weighted average, as appropriate.…”

Section: Fig 10mentioning

confidence: 99%

“…Also, in supersymmetry, the Z → bb rate (R b = Γ(Z → bb)/Γ(Z → hadrons)), the value of α s extracted from Γ Z , and the branching ratio for b → sγ are all affected by loop diagrams containing charginos and stop squarks. At present [2], all three of these quantities are 1.5-2.0σ from their Standard Model predictions, each in precisely the directions expected from supersymmetry [2][3][4][5][6][7] if there is a light stop squark.…”

Section: Introductionmentioning

confidence: 99%

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Searching for a light top squark at the Fermilab Tevatron

Mahlon

Kane

1997

Phys. Rev. D

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We describe a method to help the search for a light stop squark ( M t + M LSP < m t ) at the Fermilab Tevatron. Traditional search methods rely upon a series of stringent background-reducing cuts which, unfortunately, leave very few signal events given the present data set. To avoid this difficulty, we instead suggest using a milder set of cuts, combined with a "superweight," whose purpose is to discriminate between signal and background events. The superweight consists of a sum of terms, each of which are either zero or one. The terms are assigned event-by-event depending upon the values of various observables. We suggest a method for choosing the observables as well as the criteria used to assign the values such that the superweight is "large" for the supersymmetric signal and "small" for the standard model background. For illustration, we mainly consider the detection of stops coming from top decay, making our analysis especially relevant to the W + 2 jets top sample.

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Implications of high precision experiments and the CDF top quark candidates

Abstract: We discuss the consequences of recent experimental results from CDF, SLC, LEP and elsewhere for the Standard Model and for new physics. A global t to all indirect precision data yields m t = 175 11 +17 19 GeV, sin 2 MS = 0:2317(3)(2), and s = 0 : 127 (5)(2) Typeset using REVT E X 1

Cited by 72 publications

References 78 publications

A full-acceptance detector at the LHC (FELIX)

A full-acceptance detector at the LHC (FELIX)

Relating incomplete data and incomplete theory

Searching for a light top squark at the Fermilab Tevatron

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