scholarly journals First results on precision constraints on Z - Z′ mixing with ATLAS and CMS diboson production data at the LHC at 13 TeV and predictions for Run II

2018 ◽  
Vol 191 ◽  
pp. 02006
Author(s):  
Alexander Pankov ◽  
Vadim Bednyakov
Keyword(s):  
Global Analysis ◽  
Vector Boson ◽  
New Physics ◽  
Gauge Sector ◽  
Diboson Production ◽  
Vector Bosons ◽  
Neutral Vector ◽  
Exclusion Region ◽  
8 Tev ◽  
Using Data

The study of electroweak boson pair production provides a powerful tool to search for new phenomena beyond the Standard Model (SM). Extra neutral vector bosons Z′ decaying to charged gauge vector boson pairs W+W- are predicted in many scenarios of new physics, including models with an extended gauge sector. The diboson production allows to place stringent constraints on the Z-Z′ mixing parameter ξ and Z′ mass, MZ′. We present the Z′ exclusion region in the ξ - MZ′ plane for the first time by using data comprised of pp collisions at √s = 13 TeV and recorded by the ATLAS and CMS detectors at the CERN LHC, with integrated luminosities of 36.1 and 35.9 fb-1, respectively. The exclusion region has been significantly extended compared to that obtained from the previous analysis performed with Tevatron data, as well as with LHC data collected at 7 and 8 TeV. Also, we found that these constraints on the Z-Z′ mixing factor are more severe than those derived from the global analysis of electroweak data. Further improvement on the constraining of this mixing can be achieved from the analysis of data to be collected at higher luminosity expected in Run II.

MASS BOUNDS ON THE EXTRA NEUTRAL VECTOR BOSONS AT FUTURE e+e− COLLIDERS WITH POLARIZED BEAMS

1993 ◽  
Vol 08 (28) ◽  
pp. 5063-5077
Author(s):  
A.A. LIKHODED ◽  
M.V. SHEVLYAGIN ◽  
O.P. YUSHCHENKO
Keyword(s):  
Vector Boson ◽  
Polarized Beams ◽  
Linear Colliders ◽  
Vector Bosons ◽  
Composite Models ◽  
Neutral Vector ◽  
New Generation

After the example of the extended electroweak models, which predict the existence of the heavy neutral vector boson Z′, we discuss, for the e+e− linear colliders of the new generation, the possibilities of searching for the extra boson effects provided that various configurations of the beam polarizations will be available. For the most popular models [E6-superstring-inspired, LR- and Y(YL)-composite models] we show that realization of the specific beam polarizations can substantially enhance the experiment sensitivity to the Z′ signal in comparison with the case of the unpolarized beams.

scholarly journals Two paths towards precision at a very high energy lepton collider

2021 ◽  
Vol 2021 (5) ◽  
Author(s):  
Dario Buttazzo ◽  
Roberto Franceschini ◽  
Andrea Wulzer
Keyword(s):  
Cross Sections ◽  
Vector Boson ◽  
Center Of Mass ◽  
Percent Level ◽  
High Energy ◽  
New Physics ◽  
Higgs Production ◽  
Diboson Production ◽  
Very High Energy ◽  
Very High

Abstract We illustrate the potential of a very high energy lepton collider (from 10 to 30 TeV center of mass energy) to explore new physics indirectly in the vector boson fusion double Higgs production process and in direct diboson production at high energy. Double Higgs production is found to be sensitive to the anomalous Higgs trilinear coupling at the percent level, and to the Higgs compositeness ξ parameter at the per mille or sub-per mille level thanks to the measurement of the cross-section in the di-Higgs high invariant mass tail. High energy diboson (and tri-boson) production is sensitive to Higgs-lepton contact interaction operators at a scale of several tens or hundred TeV, corresponding to a reach on the Higgs compositeness scale well above the one of any other future collider project currently under discussion. This result follows from the unique capability of the very high energy lepton collider to measure Electroweak cross-sections at 10 TeV energy or more, where the effect of new physics at even higher energy is amplified. The general lesson is that the standard path towards precision physics, based on measurements of high-statistics processes such as single and double Higgs production, is accompanied at the very high energy lepton collider by a second strategy based on measurements at the highest available energy.

scholarly journals Searching for diboson resonances in the boosted all-hadronic final state at s = 13 TeV with CMS

2020 ◽  
Vol 35 (32) ◽  
pp. 2030014
Author(s):  
Thea Aarrestad
Keyword(s):  
Vector Boson ◽  
Center Of Mass ◽  
Large Radius ◽  
Hadronic Final State ◽  
Jet Substructure ◽  
Final State ◽  
Center Of Mass Energy ◽  
Vector Bosons ◽  
Multidimensional Fit ◽  
Using Data

This article summarizes three searches for diboson resonances in the all-hadronic final state using data collected at a center-of-mass energy of [Formula: see text] = 13 TeV with the CMS experiment at the CERN LHC. The boson decay products are contained in one large-radius jet, resulting in dijet final states which are resolved using jet substructure techniques. The analyses presented use 2.3 fb[Formula: see text], 35.9 fb[Formula: see text] and 77.3 fb[Formula: see text] of data collected between 2015 and 2017. These include the first search for diboson resonances in data collected at a 13 TeV collision energy, the introduction of a new algorithm to tag vector bosons in the context of analyzing the data collected in 2016, and the development of a novel multidimensional fit improving on the sensitivity of the previous search method with up to 30%. The results presented here are the most sensitive to date of all diboson resonance searches in the dijet final state. An emphasis on improvements in technique for vector boson tagging is made.

scholarly journals OBLIQUE RADIATIVE CORRECTIONS IN THE VECTOR CONDENSATE MODEL OF ELECTROWEAK INTERACTIONS

1995 ◽  
Vol 10 (29) ◽  
pp. 2193-2196 ◽  
Author(s):  
G. CYNOLTER ◽  
E. LENDVAI ◽  
G. PÓCSIK
Keyword(s):  
Gauge Symmetry ◽  
Standard Model ◽  
Vector Boson ◽  
Higgs Doublet ◽  
Radiative Corrections ◽  
Momentum Scale ◽  
The Standard Model ◽  
Vector Bosons ◽  
Neutral Vector ◽  
The Masses

Oblique radiative corrections are calculated to the parameter S in a version of the standard model where the Higgs doublet is replaced by a doublet of vector bosons and the gauge symmetry is broken dynamically. We show that to each momentum scale there exists a domain of the masses of charged and neutral vector bosons where S is compatible with the experiments. At a scale of 1 TeV this requires vector boson masses of at least m0 ≈ 400–550 GeV , m+ ≈ 200–350 GeV .

scholarly journals LEFT–RIGHT ASYMMETRIES AND EXOTIC VECTOR–BOSON DISCOVERY IN LEPTON–LEPTON COLLIDERS

2001 ◽  
Vol 16 (06) ◽  
pp. 1147-1160 ◽  
Author(s):  
J. C. MONTERO ◽  
V. PLEITEZ ◽  
M. C. RODRIGUEZ
Keyword(s):  
Vector Boson ◽  
Lepton Colliders ◽  
Vector Bosons ◽  
Neutral Vector ◽  
Doubly Charged

By considering left–right (L–R) asymmetries we study the capabilities of lepton colliders in searching for new exotic vector bosons. Specifically we study the effect of a doubly charged bilepton boson and an extra neutral vector boson appearing in a 3-3-1 model on the L–R asymmetries for the processes e-e-→e-e-, μ-μ-→ μ-μ- and e-μ-→e- μ- and show that these asymmetries are very sensitive to these new contributions and that they are in fact powerful tools for discovery of this sort of vector bosons.

scholarly journals Vector-Boson scattering at the LHC: Unraveling the electroweak sector

2021 ◽  
pp. 2130009
Author(s):  
Roberto Covarelli ◽  
Mathieu Pellen ◽  
Marco Zaro
Keyword(s):  
Vector Boson ◽  
Hadron Collider ◽  
New Physics ◽  
Theoretical Description ◽  
Point Of View ◽  
Experimental Point ◽  
Gauge Sector ◽  
Signal Sensitivity ◽  
Electroweak Sector ◽  
Vector Boson Scattering

Vector-boson scattering (VBS) processes probe the innermost structure of electroweak (EW) interactions in the Standard Model (SM), and provide a unique sensitivity for new physics phenomena affecting the gauge sector. In this review, we report on the salient aspects of this class of processes, both from the theory and experimental point of view. We start by discussing recent achievements relevant for their theoretical description, some of which have set important milestones in improving the precision and accuracy of the corresponding simulations. We continue by covering the development of experimental techniques aimed at detecting these rare processes and improving the signal sensitivity over large backgrounds. We then summarize the details of the most relevant VBS signatures and review the related measurements available to date, along with their comparison with SM predictions. We conclude by discussing the perspective at the upcoming Large Hadron Collider runs and at future hadron facilities.

scholarly journals Global analysis of the Sivers functions at NLO+NNLL in QCD

2021 ◽  
Vol 2021 (1) ◽  
Author(s):  
Miguel G. Echevarria ◽  
Zhong-Bo Kang ◽  
John Terry
Keyword(s):  
Pair Production ◽  
Global Analysis ◽  
Vector Boson ◽  
Lepton Pair ◽  
Transverse Spin ◽  
Dglap Evolution ◽  
Spin Asymmetries ◽  
Lepton Pair Production ◽  
Asymmetry Data ◽  
The Impact

Abstract We perform global fit to the quark Sivers function within the transverse momentum dependent (TMD) factorization formalism in QCD. We simultaneously fit Sivers asymmetry data from Semi-Inclusive Deep Inelastic Scattering (SIDIS) at COMPASS, HERMES, and JLab, from Drell-Yan lepton pair production at COMPASS, and from W/Z boson at RHIC. This extraction is performed at next-to-leading order (NLO) and next-to-next-to leading logarithmic (NNLL) accuracy. We find excellent agreement between our extracted asymmetry and the experimental data for SIDIS and Drell-Yan lepton pair production, while tension arises when trying to describe the spin asymmetries of W/Z bosons at RHIC. We carefully assess the situation, and we study in details the impact of the RHIC data and their implications through different ways of performing the fit. In addition, we find that the quality of the description of W/Z vector boson asymmetry data could be strongly sensitive to the DGLAP evolution of Qiu-Sterman function, besides the usual TMD evolution. We present discussion on this and the implications for measurements of the transverse-spin asymmetries at the future Electron Ion Collider.

scholarly journals Indirect $$ \mathcal{CP} $$ probes of the Higgs-top-quark interaction: current LHC constraints and future opportunities

2020 ◽  
Vol 2020 (11) ◽  
Author(s):  
Henning Bahl ◽  
Philip Bechtle ◽  
Sven Heinemeyer ◽  
Judith Katzy ◽  
Tobias Klingl ◽  
...  
Keyword(s):  
Higgs Boson ◽  
Standard Model ◽  
Top Quark ◽  
Decay Channel ◽  
New Physics ◽  
Current Data ◽  
Quark Interaction ◽  
The Standard Model ◽  
Vector Bosons ◽  
Selection Of

Abstract The $$ \mathcal{CP} $$ CP structure of the Higgs boson in its coupling to the particles of the Standard Model is amongst the most important Higgs boson properties which have not yet been constrained with high precision. In this study, all relevant inclusive and differential Higgs boson measurements from the ATLAS and CMS experiments are used to constrain the $$ \mathcal{CP} $$ CP -nature of the top-Yukawa interaction. The model dependence of the constraints is studied by successively allowing for new physics contributions to the couplings of the Higgs boson to massive vector bosons, to photons, and to gluons. In the most general case, we find that the current data still permits a significant $$ \mathcal{CP} $$ CP -odd component in the top-Yukawa coupling. Furthermore, we explore the prospects to further constrain the $$ \mathcal{CP} $$ CP properties of this coupling with future LHC data by determining tH production rates independently from possible accompanying variations of the $$ t\overline{t}H $$ t t ¯ H rate. This is achieved via a careful selection of discriminating observables. At the HL-LHC, we find that evidence for tH production at the Standard Model rate can be achieved in the Higgs to diphoton decay channel alone.

scholarly journals Vector boson fusion at multi-TeV muon colliders

2020 ◽  
Vol 2020 (9) ◽  
Author(s):  
Antonio Costantini ◽  
Federico De Lillo ◽  
Fabio Maltoni ◽  
Luca Mantani ◽  
Olivier Mattelaer ◽  
...  
Keyword(s):  
Cross Sections ◽  
Vector Boson ◽  
High Energy ◽  
New Physics ◽  
Vector Boson Fusion ◽  
Weak Boson ◽  
Wide Range ◽  
Lepton Colliders ◽  
Muon Colliders ◽  
New Phenomena

Abstract High-energy lepton colliders with a centre-of-mass energy in the multi-TeV range are currently considered among the most challenging and far-reaching future accelerator projects. Studies performed so far have mostly focused on the reach for new phenomena in lepton-antilepton annihilation channels. In this work we observe that starting from collider energies of a few TeV, electroweak (EW) vector boson fusion/scattering (VBF) at lepton colliders becomes the dominant production mode for all Standard Model processes relevant to studying the EW sector. In many cases we find that this also holds for new physics. We quantify the size and the growth of VBF cross sections with collider energy for a number of SM and new physics processes. By considering luminosity scenarios achievable at a muon collider, we conclude that such a machine would effectively be a “high-luminosity weak boson collider,” and subsequently offer a wide range of opportunities to precisely measure EW and Higgs couplings as well as discover new particles.

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