scholarly journals Possible discrepancies between cosmological and electroweak observables in Higgs Inflation

2021 ◽  
Vol 2021 (11) ◽  
Author(s):  
Jamerson G. Rodrigues ◽  
Micol Benetti ◽  
Jailson S. Alcaniz
Keyword(s):  
Top Quark ◽  
Acoustic Oscillation ◽  
Data Sets ◽  
Top Quark Mass ◽  
Top Quark Production ◽  
Type Ia ◽  
Quark Production ◽  
Cosmological Data ◽  
Inflationary Parameters ◽  
Ia Supernovae

Abstract In this work, we revisit the non-minimally coupled Higgs Inflation scenario and investigate its observational viability in light of the current Cosmic Microwave Background, Baryon Acoustic Oscillation and type Ia Supernovae data. We explore the effects of the Coleman-Weinberg approximation to the Higgs potential in the primordial universe, connecting the predictions for the Lagrangian parameters at inflationary scales to the electroweak observables through Renormalization Group methods at two-loop order. Initially, we find that electroweak scale measurements may be dissonant to the limits obtained from the cosmological data sets used in the analysis. Specifically, an ≈ 8σ-discrepancy between the inflationary parameters and the value of the Monte Carlo reconstructed top quark mass is found. However, considering the most recent results obtained by the CMS Collaboration from differential cross-section measurements of the top quark production a good agreement is obtained.

scholarly journals Review of recent measurements in the top quark sector at the Tevatron

2014 ◽  
Vol 29 (18) ◽  
pp. 1430014 ◽  
Author(s):  
Andreas W. Jung
Keyword(s):  
Cross Sections ◽  
Top Quark ◽  
Top Quarks ◽  
Current Status ◽  
Angular Distributions ◽  
Data Sets ◽  
Full Data ◽  
Quark Sector ◽  
Top Quark Production ◽  
Quark Production

Recent measurements in the top quark sector at the Fermilab Tevatron collider are discussed. Measurements at the Tevatron use up to 9.7 fb-1 of data corresponding to the full data sets recorded by each of the experiments, CDF and DØ. This review discusses the most recent measurements of inclusive and differential top quark cross-sections in strong and electroweak production of top quarks and related measurements, as well as measurements of angular distributions related to asymmetries in top quark production. Furthermore, the current status of precision measurements of the mass of the top quark is discussed. Where available, combinations of CDF and DØ results are presented.

scholarly journals Top quark production near threshold and the top quark mass

1999 ◽  
Vol 454 (1-2) ◽  
pp. 137-146 ◽  
Author(s):  
M. Beneke ◽  
A. Signer ◽  
V.A. Smirnov
Keyword(s):  
Top Quark ◽  
Quark Mass ◽  
Top Quark Mass ◽  
Top Quark Production ◽  
Quark Production ◽  
Near Threshold

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.

OBSERVATION OF THE TOP QUARK

1996 ◽  
Vol 11 (21) ◽  
pp. 3819-3848
Author(s):  
SOO-BONG KIM
Keyword(s):  
Top Quark ◽  
Quark Mass ◽  
Production Cross ◽  
Top Quark Mass ◽  
Text Production ◽  
Top Quark Production ◽  
Top Quark Decay ◽  
Quark Production ◽  
Quark Decay ◽  
Kinematic Properties

Top-quark production is observed in [Formula: see text] collisions at [Formula: see text] at the Fermilab Tevatron. The CDF and DØ collaborations observe signals consistent with [Formula: see text] to [Formula: see text] but inconsistent with the background prediction by 4.8σ (CDF) and 4.6σ (DØ). Additional evidence for the top quark is provided by a peak in the reconstructed mass distribution. The kinematic properties of the excess events are consistent with the top-quark decay. The top-quark mass has been measured to be 176±8 (stat.) ±10 (sys.) GeV /c2 (CDF) and [Formula: see text]±22(sys.)GeV/c2 (DØ), and the [Formula: see text]-production cross section to be [Formula: see text] and 6.4±2.2 pb (DØ).

scholarly journals Top-quark mass determination from t-channel single top production at the LHC

2021 ◽  
Vol 2021 (4) ◽  
Author(s):  
Mei Sen Gao ◽  
Shu Run Yuan ◽  
Jun Gao
Keyword(s):  
Top Quark ◽  
Charged Lepton ◽  
Quark Mass ◽  
Top Quark Mass ◽  
Narrow Width Approximation ◽  
Single Top ◽  
Top Quark Production ◽  
Quark Production ◽  
Narrow Width

Abstract We study the determination of the top-quark mass using leptonic observables in t-channel single top-quark production at the LHC. We demonstrate sensitivity of transverse momentum of the charged lepton on the input top-quark mass. We present predictions at next-to-next-to-leading order (NNLO) in QCD with narrow width approximation and structure function approach. Further corrections due to parton shower and hadronization, non-resonant and non-factorized contributions are discussed. To reduce impact of SM backgrounds we propose to use the charge weighted distribution for the measurement, i.e., differences between distributions of charged lepton with positive and negative charges. By modeling both signal and background processes, we found the projections for (HL-)LHC to be promising, with a total theoretical uncertainty on the extracted top-quark mass of about 1 ∼ 2 GeV.

scholarly journals TOP QUARK PHYSICS

2008 ◽  
Vol 23 (27n28) ◽  
pp. 4421-4433 ◽  
Author(s):  
◽  
ERICH W. VARNES
Keyword(s):  
Top Quark ◽  
Production Cross ◽  
New Physics ◽  
Recent Measurement ◽  
Top Quark Mass ◽  
Text Production ◽  
Single Top ◽  
The Standard Model ◽  
Top Quark Production ◽  
Quark Production

A review is presented of the current experimental status of the top quark sector of the Standard Model. The measurements summarized include searches for electroweak single top production, the latest results on the [Formula: see text] production cross-section, and searches for new physics in top quark production and decay. In addition, the recent measurement of the top quark mass to a precision of 0.7% is highlighted.

scholarly journals Cosmographic Parameters in Model-independent Approaches

2021 ◽  
Vol 923 (2) ◽  
pp. 274
Author(s):  
Ahmad Mehrabi ◽  
Mehdi Rezaei
Keyword(s):  
High Redshift ◽  
Data Sets ◽  
Ongoing Debate ◽  
Technical Problems ◽  
Advantages And Disadvantages ◽  
Type Ia ◽  
Cosmological Data ◽  
Model Independent ◽  
Ia Supernovae ◽  
The Universe

Abstract The cosmographic approach, a Taylor expansion of the Hubble function, has been used as a model-independent method to investigate the evolution of the universe in the presence of cosmological data. Apart from possible technical problems like the radius of convergence, there is an ongoing debate about the tensions that appear when one investigates some high-redshift cosmological data. In this work, we consider two common data sets, namely, Type Ia supernovae (Pantheon sample) and the Hubble data, to investigate advantages and disadvantages of the cosmographic approach. To do this, we obtain the evolution of cosmographic functions using the cosmographic method, as well as two other well-known model-independent approaches, namely, the Gaussian process and the genetic algorithm. We also assume a ΛCDM model as the concordance model to compare the results of mentioned approaches. Our results indicate that the results of cosmography compared with the other approaches are not exact enough. Considering the Hubble data, which are less certain, the results of q 0 and j 0 obtained in cosmography provide a tension at more than 3σ away from the best result of ΛCDM. Assuming both of the data samples in different approaches, we show that the cosmographic approach, because it provides some biased results, is not the best approach for reconstruction of cosmographic functions, especially at higher redshifts.

Littlest Higgs Model and Spin Correlation of Top Quark Production at High Energy Linear e + e − Colliders

2006 ◽  
Vol 23 (9) ◽  
pp. 2379-2382 ◽  
Author(s):  
Yue Chong-Xing ◽  
Wang Lei ◽  
Wang Li-Na ◽  
Zhang Yan-Ming
Keyword(s):  
Top Quark ◽  
Spin Correlation ◽  
High Energy ◽  
Higgs Model ◽  
Top Quark Production ◽  
Quark Production
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