TOP AND HIGGS HUNTING VIA Mw AND Γz

1991 ◽  
Vol 06 (23) ◽  
pp. 2129-2135 ◽  
Author(s):  
ZENRŌ HIOKI
Keyword(s):  
Top Quark ◽  
Z Boson ◽  
W Boson ◽  
Parton Model ◽  
Boson Mass ◽  
Top Quark Mass ◽  
Total Decay Width ◽  
Model Calculations ◽  
Hadron Physics ◽  
Electroweak Radiative Corrections

Virtual top and Higgs effects are studied through the electroweak radiative corrections to the W boson mass, MW, and the total decay-width of the Z boson, ΓZ, by using the data [Formula: see text], [Formula: see text] and [Formula: see text]. Carrying out the χ2 fit in the framework of the standard electroweak theory, constraints are derived on the top-quark mass, mt, and the Higgs–boson mass, mϕ, which are almost free from the complicated hadron physics like parton model calculations. For example, [Formula: see text] for mϕ = 100 GeV (at 1σ level) while mϕ ≲ 680 GeV if mt ≤ 110 GeV and mϕ ≳ 280 GeV if mt ≥ 190 GeV . It is also studied how precise measurements of MW at LEP II improve these constraints.

scholarly journals Mixed EW-QCD leading fermionic three-loop corrections at $$ \mathcal{O} $$(αsα2) to electroweak precision observables

2021 ◽  
Vol 2021 (3) ◽  
Author(s):  
Lisong Chen ◽  
Ayres Freitas
Keyword(s):  
Top Quark ◽  
Z Boson ◽  
W Boson ◽  
Boson Mass ◽  
Top Quark Mass ◽  
Weak Mixing Angle ◽  
Mixing Angle ◽  
The Standard Model ◽  
Precision Observables ◽  
Electroweak Precision

Abstract Measurements of electroweak precision observables at future electron-position colliders, such as the CEPC, FCC-ee, and ILC, will be sensitive to physics at multi-TeV scales. To achieve this sensitivity, precise predictions for the Standard Model expectations of these observables are needed, including corrections at the three- and four-loop level. In this article, results are presented for the calculation of a subset of three-loop mixed electroweak-QCD corrections, stemming from diagrams with a gluon exchange and two closed fermion loops. The numerical impact of these corrections is illustrated for a number of applications: the prediction of the W-boson mass from the Fermi constant, the effective weak mixing angle, and the partial and total widths of the Z boson. Two alternative renormalization schemes for the top-quark mass are considered, on-shell and $$ \overline{\mathrm{MS}} $$ MS ¯ .

CANCELLATION OF ULTRAVIOLET DIVERGENCES IN THE SU(2)L×U(1) ELECTROWEAK MODEL

1989 ◽  
Vol 04 (28) ◽  
pp. 2733-2738 ◽  
Author(s):  
ROGER DECKER ◽  
JEAN PESTIEAU
Keyword(s):  
Top Quark ◽  
Z Boson ◽  
Charged Lepton ◽  
W Boson ◽  
Boson Mass ◽  
Three Generations ◽  
Electroweak Model

We assume that, in the SU(2)L×U(1) model, ultraviolet divergences of the charged lepton self-masses are zero. We predict the top and Higgs masses in the vicinity of the Z-boson mass. Our assumption holds only if there are no more than three generations of quarks and leptons and if quarks and leptons, except for the top quark, have negligible masses compared to the W-boson mass.

scholarly journals THE MINIMAL SUPERSYMMETRIC STANDARD MODEL AND PRECISION OF W-BOSON MASS AND TOP QUARK MASS

1998 ◽  
Vol 13 (32) ◽  
pp. 2613-2620 ◽  
Author(s):  
KYUNGSIK KANG ◽  
SIN KYU KANG
Keyword(s):  
Higgs Boson ◽  
Standard Model ◽  
Top Quark ◽  
Quark Mass ◽  
W Boson ◽  
Boson Mass ◽  
Higgs Boson Mass ◽  
Top Quark Mass ◽  
Present Value ◽  
Central Values

We argue that the present value and accuracy of MW and mt measurements tend to favor the MSSM, provided that the central values of MW and mt stay at the current values, over the SM. By speculating that a precision of order 40 MeV and 3 GeV respectively for MW and mt will be achieved at LEP2 and Tevatron, we show that the prospect for the MSSM will be further enhanced as long as the central values of MW and mt do not increase below the present values. In addition, we discuss how this scenario can constrain the Higgs boson mass and distinguish the Higgs boson of the MSSM type from that of the SM.

scholarly journals ELECTROWEAK RADIATIVE CORRECTIONS TO W AND Z BOSON PRODUCTION AT HADRON COLLIDERS

2001 ◽  
Vol 16 (supp01a) ◽  
pp. 326-328 ◽  
Author(s):  
ULRICH BAUR ◽  
DOREEN WACKEROTH
Keyword(s):  
Precision Measurement ◽  
Z Boson ◽  
W Boson ◽  
Boson Mass ◽  
Radiative Corrections ◽  
Hadron Colliders ◽  
High Precision Measurement ◽  
Electroweak Radiative Corrections ◽  
Theoretical Predictions ◽  
The Status

For the envisioned high precision measurement of the W boson mass at the Tevatron and LHC it is crucial that the theoretical predictions for the W and Z production processes are under control. We briefly summarize the status of the electroweak radiative corrections to [Formula: see text] and [Formula: see text], γ → l+l- (l = e, μ), and present some numerical results.

Upper Bounds on Top Quark Mass, Z Boson Decay Widths and Mass Ratio M W / M Z

1992 ◽  
Vol 18 (4) ◽  
pp. 427-434
Author(s):  
Zhen-Jun Xiao ◽  
Gong-Ru Lu ◽  
Yi-bing DING
Keyword(s):  
Top Quark ◽  
Z Boson ◽  
Quark Mass ◽  
Upper Bounds ◽  
Mass Ratio ◽  
Top Quark Mass ◽  
Decay Widths

scholarly journals Electroweak measurements from W, Z and photon final states

2014 ◽  
Vol 31 ◽  
pp. 1460276
Author(s):  
Hang Yin ◽  
Keyword(s):  
Differential Cross Section ◽  
Cross Section ◽  
Z Boson ◽  
W Boson ◽  
Charge Asymmetry ◽  
Distribution Functions ◽  
Boson Mass ◽  
Electroweak Theory ◽  
Final States ◽  
Parton Distribution Functions

We present the most recent precision electroweak measurements of single W and Z boson cross section and properties from the LHC and Tevatron colliders, analyzing data collected by ATLAS, CDF, CMS, D0, and LHCb detectors. The results include the measurement of the single W and Z boson cross section at LHC, the differential cross section measurements, the measurement of W boson mass, the measurement of W and Z charge asymmetry. These measurements provide precision tests on the electroweak theory, high order predictions and the information can be used to constraint parton distribution functions.

scholarly journals Review of physics results from the Tevatron: Electroweak physics

2015 ◽  
Vol 30 (06) ◽  
pp. 1541004 ◽  
Author(s):  
Ashutosh V. Kotwal ◽  
Heidi Schellman ◽  
Jadranka Sekaric
Keyword(s):  
Z Boson ◽  
W Boson ◽  
Mass Measurement ◽  
New Physics ◽  
Boson Mass ◽  
Precision Measurements ◽  
Boson Production ◽  
Physics Program ◽  
Electroweak Sector ◽  
Electroweak Physics

We summarize an extensive Tevatron (1984–2011) electroweak physics program that involves a variety of W and Z boson precision measurements. The relevance of these studies using single and associated gauge boson production to our understanding of the electroweak sector, quantum chromodynamics and searches for new physics is emphasized. We discuss the importance of the W boson mass measurement, the W/Z boson distributions and asymmetries, and diboson studies. We highlight the recent Tevatron measurements and prospects for the final Tevatron measurements.

scholarly journals EXPERIMENTAL CONSEQUENCES OF ONE-PARAMETER NO-SCALE SUPERGRAVITY MODELS

1995 ◽  
Vol 10 (29) ◽  
pp. 4241-4264 ◽  
Author(s):  
JORGE L. LOPEZ ◽  
D.V. NANOPOULOS ◽  
A. ZICHICHI
Keyword(s):  
Higgs Boson ◽  
Supergravity Models ◽  
Pair Production ◽  
Top Quark ◽  
Quark Mass ◽  
Branching Ratio ◽  
Boson Mass ◽  
Top Quark Mass ◽  
Top Squark ◽  
Actual Measurement

We consider the experimental predictions of two one-parameter no-scale SU (5)× U (1) supergravity models with string-inspired moduli and dilaton seeds of supersymmetry breaking. These predictions have been considerably sharpened with the new information on the top-quark mass from the Tevatron, and the actual measurement of the B(b→sγ) branching ratio from CLEO. In particular, the sign of the Higgs mixing parameter μ is fixed. A more precise measurement of the top-quark mass above (below) ≈160 GeV would disfavor the dilaton (moduli) scenario. Similarly a measurement of the lightest Higgs-boson mass above 90 GeV (below 100 GeV) would disfavor the dilaton (moduli) scenario. At the Tevatron with 100 pb−1, the reach into parameter space is significant only in the dilaton scenario [Formula: see text] via the trilepton and top-squark signals. At LEPII the dilaton scenario could be probed up to the kinematical limit via chargino and top-squark pair production, and the discovery of the lightest Higgs boson is guaranteed. In the moduli scenario, only selectron pair production looks promising. We also calculate the supersymmetric contribution to the anomalous magnetic moment of the muon.

scholarly journals FOCUS POINTS AND THE LIGHTEST HIGGS BOSON MASS IN THE MINIMAL SUPERSYMMETRIC STANDARD MODEL

2006 ◽  
Vol 21 (25) ◽  
pp. 1923-1929 ◽  
Author(s):  
E. JURČIŠINOVÁ ◽  
M. JURČIŠIN
Keyword(s):  
Higgs Boson ◽  
Standard Model ◽  
Supersymmetric Standard Model ◽  
Minimal Supersymmetric Standard Model ◽  
Top Quark ◽  
Boson Mass ◽  
Top Quark Mass ◽  
Soft Supersymmetry Breaking ◽  
Focus Point

We investigate the focus points of the renormalization group equations of the minimal supersymmetric standard model. We show that within this model the up- and down-type Higgs mass soft supersymmetry breaking parameters have focus point behavior at the electroweak scale simultaneously when appropriate conditions are fulfilled. The focus point scenario holds for large tan β. This two-focus-point scenario allows to fix the pole top-quark mass which is within the experimentally allowed interval. The main goal of this paper is the investigation of the influence of the existence of focus points on the determination of the mass of the lightest Higgs boson.

scholarly journals Evidence for Top Quark Production in pp Collisions at vs = 1.8 TeV

1995 ◽  
Vol 48 (2) ◽  
pp. 207
Author(s):  
Paul L Tipton for the CDF Collaboration
Keyword(s):  
Cross Section ◽  
Top Quark ◽  
Quark Mass ◽  
W Boson ◽  
Production Cross ◽  
W Bosons ◽  
Top Quark Mass ◽  
Pp Collisions ◽  
Top Quark Production ◽  
Quark Production

We summarise a search for the top quark with the Collider Detector at Fermilab (CDF) in a sample of pp collisions at Vs = 1� 8 Te V with an integrated luminosity of 19�3 pb ~ 1. We find 12 events consistent with either two W bosons, or a W boson and at least one b jet. Both of these are signatures for tt events. The probability that the measured yield is consistent with the background is 0�26%. Though the statistics are too limited to establish firmly the existence of the top quark, a natural interpretation of the excess is that it is due to tt production. Under this assumption, constrained fits to individual events yield a top quark mass of 174 � lO:::g GeV / c2? The tt production cross section is measured to be 13.9:::~:~ pb.

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