scholarly journals Search for Anomalous Quartic ZZγγ Couplings in Photon-Photon Collisions

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
M. Köksal ◽  
V. Arı ◽  
A. Senol
Keyword(s):  
Linear Collider ◽  
Center Of Mass ◽  
High Energy ◽  
New Physics ◽  
Energy Scale ◽  
Mass Energy ◽  
Abelian Gauge ◽  
Center Of Mass Energy ◽  
High Energy Scale ◽  
Integrated Luminosity

The self-couplings of the electroweak gauge bosons are completely specified by the non-Abelian gauge nature of the Standard Model (SM). The direct study of these couplings provides a significant opportunity to test the validity of the SM and the existence of new physics beyond the SM up to the high energy scale. For this reason, we investigate the potential of the processes γγ→ZZ, e-γ→e-γ⁎γ→e-ZZ,  and e+e-→e+γ⁎γ⁎e-→e+ZZe- to examine the anomalous quartic couplings of ZZγγ vertex at the Compact Linear Collider (CLIC) with center-of-mass energy 3 TeV. We calculate 95% confidence level sensitivities on the dimension-8 parameters with various values of the integrated luminosity. We show that the best bounds on the anomalous fM2/Λ4, fM3/Λ4, fT0/Λ4, and fT9/Λ4 couplings arising from γγ→ZZ process among those three processes at center-of-mass energy of 3 TeV and integrated luminosity of Lint=2000 fb−1 are found to be [-3.30;3.30]×10-3 TeV−4, [-1.20;1.20]×10-2 TeV−4, [-3.40;3.40]×10-3 TeV−4, and [-1.80;1.80]×10-3 TeV−4, respectively.

High(est) energy lepton colliders

2021 ◽  
pp. 2142016
Author(s):  
Roberto Franceschini
Keyword(s):  
Standard Model ◽  
Center Of Mass ◽  
High Energy ◽  
New Physics ◽  
Mass Energy ◽  
Center Of Mass Energy ◽  
Lepton Colliders ◽  
The Standard Model

We discuss the physics opportunities and challenges presented by high energy lepton colliders in the range of center-of-mass energy between few and several tens of TeV. The focus is on the progress attainable on the study of weak and Higgs interactions in connection with new physics scenarios motivated by the shortcomings of the Standard Model.

Single production of vector-like top partner in the Wb channel at eγ collision in the LHT model

2019 ◽  
Vol 34 (18) ◽  
pp. 1950093
Author(s):  
Guang Yang ◽  
Bingfang Yang ◽  
Biaofeng Hou ◽  
Hengheng Bi
Keyword(s):  
Search Strategy ◽  
Center Of Mass ◽  
High Energy ◽  
Mass Energy ◽  
Center Of Mass Energy ◽  
Energy Formula ◽  
Single Production ◽  
Detector Simulation ◽  
Higgs Data ◽  
Integrated Luminosity

In the framework of the littlest Higgs Model with T-parity (LHT), we investigate the single production of vector-like top partner [Formula: see text] decaying to [Formula: see text] in the leptonic channel at the high energy [Formula: see text] collision. We utilize the polarized electron beam and photon beam to enhance the signal and propose a search strategy by performing a detector simulation. On the basis of the current limits from the precision electroweak data and Higgs data, we find that the top partner mass can be excluded up to 1350 (1380) GeV with integrated luminosity of 1000 fb[Formula: see text] and 1400 (1470) GeV with integrated luminosity of 3000 fb[Formula: see text] for the [Formula: see text] TeV (2.4 TeV) at the [Formula: see text] level. If the center-of-mass energy can be improved to 3.0 TeV, the limits on the top partner mass will reach 1450 (1550) GeV with integrated luminosities of 1000 (3000) fb[Formula: see text].

INTERMITTENCY PATTERNS IN PROTON-NUCLEUS INTERACTIONS AT HIGH ENERGY

1993 ◽  
Vol 08 (40) ◽  
pp. 3853-3859 ◽  
Author(s):  
D. K. MAITY ◽  
P. K. BANERJEE ◽  
B. B. DAS ◽  
D. RAVINDRAN ◽  
D. K. BHATTACHARJEE
Keyword(s):  
Power Law ◽  
Quark Gluon Plasma ◽  
Center Of Mass ◽  
Gluon Plasma ◽  
High Energy ◽  
Mass Energy ◽  
Factorial Moments ◽  
Center Of Mass Energy

A study of intermittency in hadron-nucleus and the comparison with nucleus-nucleus interactions is presented. The power law behavior of the factorial moments and the variation of intermittency index with the center-of-mass energy are shown. Results favor the formation of quark-gluon plasma in preference to a cascade mechanism.

scholarly journals High-energy resummation in heavy-quark pair hadroproduction

2019 ◽  
Vol 79 (11) ◽  
Author(s):  
A. D. Bolognino ◽  
Francesco Giovanni Celiberto ◽  
M. Fucilla ◽  
D. Yu. Ivanov ◽  
A. Papa
Keyword(s):  
Heavy Quark ◽  
Cross Section ◽  
Center Of Mass ◽  
High Energy ◽  
Heavy Quarks ◽  
Mass Energy ◽  
Center Of Mass Energy ◽  
Large Separation ◽  
Bfkl Approach ◽  
Heavy Quark Pair

AbstractThe inclusive hadroproduction of two heavy quarks, featuring a large separation in rapidity, is proposed as a novel probe channel of the Balitsky–Fadin–Kuraev–Lipatov (BFKL) approach. In a theoretical setup which includes full resummation of leading logarithms in the center-of-mass energy and partial resummation of the next-to-leading ones, predictions for the cross section and azimuthal coefficients are presented for kinematic configurations typical of current and possible future experimental analyses at the LHC.

scholarly journals tt̄H Coupling Measurement with the ATLAS Detector at the LHC

2018 ◽  
Vol 182 ◽  
pp. 02052
Author(s):  
Asma Hadef
Keyword(s):  
Higgs Boson ◽  
Cross Sections ◽  
Top Quark ◽  
High Energy Physics ◽  
Center Of Mass ◽  
High Energy ◽  
New Physics ◽  
Decay Modes ◽  
Center Of Mass Energy ◽  
Higgs Decay

The Higgs boson was discovered on the 4th of July 2012 with a mass around 125 GeV by ATLAS and CMS experiments at LHC. Determining the Higgs properties (production and decay modes, couplings,...) is an important part of the high-energy physics programme in this decade. A search for the Higgs boson production in association with a top quark pair (tt̄H) at ATLAS [1] is summarized in this paper at an unexplored center-of-mass energy of 13 TeV, which could allow a first direct measurement of the top quark Yukawa coupling and could reveal new physics. The tt̄H analysis in ATLAS is divided into 3 channels according to the Higgs decay modes: H → Hadrons, H → Leptons and H → Photons. The best-fit value of the ratio of observed and Standard Model cross sections of tt̄H production process, using 2015-2016 data and combining all tt̄H final states, is 1:8±0:7, corresponds to 2:8σ (1:8σ) observed (expected) significance.

scholarly journals New Fitting Concept in ATLAS muon tracking for the LHC Run-2

2019 ◽  
Vol 214 ◽  
pp. 06006
Author(s):  
William Leight ◽  
Pierre-Francois Giraud ◽  
Peter Kluit ◽  
Jochen Meyer ◽  
Edward Moyse ◽  
...  
Keyword(s):  
Center Of Mass ◽  
New Physics ◽  
High Momentum ◽  
Alignment Quality ◽  
Mass Energy ◽  
Center Of Mass Energy ◽  
Expected Performance ◽  
Muon Tracking ◽  
Performance Gains ◽  
Important Constituent

Muons with high momentum - above 500 GeV - are an important constituent of new physics signatures in many models. Run-2 of the LHC is greatly increasing ATLAS’s sensitivity to such signatures thanks to an ever-larger dataset of such particles, enhanced further by an increase in the center-of-mass energy. The ATLAS Muon Spectrometer chamber alignment contributes significantly to the uncertainty of the reconstruction of these high-momentum objects. The proper treatment of measurements during tracking and the correct propagation of the alignment effects is extremely challenging. Recently, an innovative approach that imposes Gaussian constraints on ensembles of detector hits was implemented. It provides a significant improvement to high-momentum tracking without increasing the CPU budget. Furthermore, it allows for the verification of the expected alignment quality using high-statistics collision data. A detailed discussion of the algorithmic realization is given, the expected performance gains are presented and prospects for further applications of the approach are outlined.

scholarly journals AFTER THE STANDARD MODEL: NEW RESONANCES AT THE LHC

2009 ◽  
Vol 24 (01) ◽  
pp. 1-15 ◽  
Author(s):  
GUSTAAF BROOIJMANS
Keyword(s):  
Large Hadron Collider ◽  
Standard Model ◽  
Hadron Collider ◽  
Center Of Mass ◽  
New Physics ◽  
Mass Energy ◽  
High Expectations ◽  
Center Of Mass Energy ◽  
Energy Regime ◽  
The Standard Model

Experiments will soon start taking data at CERN's Large Hadron Collider (LHC) with high expectations for discovery of new physics phenomena. Indeed, the LHC's unprecedented center-of-mass energy will allow the experiments to probe an energy regime where the standard model is known to break down. Here, the experiments' capability to observe new resonances in various channels is reviewed.

A MEASUREMENT OF THE TOTAL PHOTON-PROTON CROSS SECTION AT HERA

2001 ◽  
Vol 16 (supp01a) ◽  
pp. 199-201
Author(s):  
RICHARD CROSS
Keyword(s):  
Cross Section ◽  
Center Of Mass ◽  
Zeus Detector ◽  
Mass Energy ◽  
Photon Virtuality ◽  
Center Of Mass Energy ◽  
Integrated Luminosity

The total photon-proton cross section has been measured in the process e+ p → e+ + γ* p → e+ + X with the ZEUS detector at HERA. Events were accepted with photon virtuality Q2 < 0.02 GeV 2, with average γ* p center-of-mass energy Wγ*p = 207 GeV . The data were recorded in a dedicated, systematics-controlled run with an integrated luminosity of 50 nb -1.

scholarly journals Probing the Higgs with angular observables at future e+e− colliders

2016 ◽  
Vol 31 (33) ◽  
pp. 1644005 ◽  
Author(s):  
Zhen Liu
Keyword(s):  
Center Of Mass ◽  
Blind Spot ◽  
New Physics ◽  
Effective Field ◽  
Mass Energy ◽  
Center Of Mass Energy ◽  
Physics Potential ◽  
Energy Formula ◽  
Scalar Top ◽  
The Impact

I summarize our recent works on using differential observables to explore the physics potential of future [Formula: see text] colliders in the framework of Higgs effective field theory. This proceeding is based upon Refs. 1 and 2. We study angular observables in the [Formula: see text] channel at future circular [Formula: see text] colliders such as CEPC and FCC-ee. Taking into account the impact of realistic cut acceptance and detector effects, we forecast the precision of six angular asymmetries at CEPC (FCC-ee) with center-of-mass energy [Formula: see text] GeV and 5 (30) ab[Formula: see text] integrated luminosity. We then determine the projected sensitivity to a range of operators relevant for the Higgsstrahlung process in the dimension-6 Higgs EFT. Our results show that angular observables provide complementary sensitivity to rate measurements when constraining various tensor structures arising from new physics. We further find that angular asymmetries provide a novel means of constraining the “blind spot” in indirect limits on supersymmetric scalar top partners. We also discuss the possibility of using [Formula: see text]-fusion at [Formula: see text] machines at different energies to probe new operators.

scholarly journals Bounds on the Electromagnetic Dipole Moments through the Single Top Production at the CLIC

2017 ◽  
Vol 2017 ◽  
pp. 1-14 ◽  
Author(s):  
M. Köksal ◽  
A. A. Billur ◽  
A. Gutiérrez-Rodríguez
Keyword(s):  
Top Quark ◽  
Dipole Moments ◽  
Center Of Mass ◽  
High Energy ◽  
New Physics ◽  
Center Of Mass Energy ◽  
Systematic Uncertainties ◽  
Single Top ◽  
Top Quark Production ◽  
Quark Production

We obtain bounds on the anomalous magnetic and electric dipole moments of thet-quark from a future high-energy and high-luminosity linear electron positron collider, as the CLIC, with polarized and unpolarized electron beams which are powerful tools for determining new physics. We consider the processesγe-→t¯bνe(γis the Compton backscattering photon) ande+e-→e-γ⁎e+→t¯bνee+(γ⁎is the Weizsacker-Williams photon) as they are one of the most important sources of single top quark production. For systematic uncertainties ofδsys=0%  (5%),b-tagging  efficiency=0.8, center-of-mass energy ofs=3 TeV, and integrated luminosity ofL=2ab-1the futuree+e-collider may put bounds on the electromagnetic dipole momentsa^Vanda^Aof the top quark of the order ofO(10-2–10-1)at the2σ  (3σ)level, which are competitive with those recently reported in previous studies at hadron colliders and the ILC.

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