scholarly journals A fully differential SMEFT analysis of the golden channel using the method of moments

2021 ◽  
Vol 2021 (6) ◽  
Author(s):  
Shankha Banerjee ◽  
Rick S. Gupta ◽  
Oscar Ochoa-Valeriano ◽  
Michael Spannowsky ◽  
Elena Venturini
Keyword(s):  
Method Of Moments ◽  
Decay Channel ◽  
Effective Theory ◽  
Higgs Coupling ◽  
Differential Analysis ◽  
Specific Process ◽  
Fully Differential ◽  
Associated Production ◽  
Higgs Decay ◽  
Production Processes

Abstract The Method of Moments is a powerful framework to disentangle the relative contributions of amplitudes of a specific process to its various phase space regions. We apply this method to carry out a fully differential analysis of the Higgs decay channel h → 4ℓ and constrain gauge-Higgs coupling modifications parametrised by dimension-six effective operators. We find that this analysis approach provides very good constraints and minimises degeneracies in the parameter space of the effective theory. By combining the decay h → 4ℓ with Higgs-associated production processes, Wh and Zh, we obtain the strongest reported bounds on anomalous gauge-Higgs couplings.

scholarly journals Higgs boson production in the U(1)B−L model at the ILC

2016 ◽  
Vol 31 (17) ◽  
pp. 1650099 ◽  
Author(s):  
Jinzhong Han ◽  
Bingfang Yang ◽  
Ning Liu ◽  
Jitao Li
Keyword(s):  
Higgs Boson ◽  
Cross Sections ◽  
Linear Collider ◽  
Decay Channel ◽  
Production Cross ◽  
International Linear Collider ◽  
Boson Production ◽  
Higgs Boson Production ◽  
Higgs Decay ◽  
Production Processes

In the framework of the minimal [Formula: see text] extension of the Standard Model, we investigate the Higgs boson production processes [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text] and [Formula: see text] at the International Linear Collider (ILC). We present the production cross-sections, the relative corrections and compare our results with the expected experimental accuracies for Higgs decay channel [Formula: see text]. In the allowed parameter space, we find that the effects of the three single Higgs boson production processes might approach the observable threshold of the ILC. But the Higgs signal strengths [Formula: see text] of the two double Higgs boson production processes are all out of the observable threshold so that these effects will be difficult to be observed at the ILC.

scholarly journals Searching for the Higgsino-Bino sector at the LHC

2020 ◽  
Vol 2020 (9) ◽  
Author(s):  
Jia Liu ◽  
Navin McGinnis ◽  
Carlos E. M. Wagner ◽  
Xiao-Ping Wang
Keyword(s):  
Higgs Boson ◽  
Decay Channel ◽  
Higgs Bosons ◽  
Production Mode ◽  
Direct Production ◽  
Decay Modes ◽  
Associated Production ◽  
Higgs Decay ◽  
The One ◽  
Production Channel

Abstract We study the search for electroweakinos at the 13 TeV LHC in the case of heavy scalar superpartners. We consider both the direct production mode and the one associated with the decay of heavy Higgs bosons, and concentrate on the case of light Higgsinos and Binos. In this case, the direct production searches becomes more challenging than in the light Wino scenario. In the direct production mode, we use the current experimental searches to set the reach for these particles at larger luminosities, and we emphasize the relevance of considering both the neutral gauge boson and the neutral Higgs decay modes of the second and third lightest neutralino. We show the complementarity of these searches with the ones induced by the decay of the heavy Higgs bosons, which are dominated by the associated production of the lightest neutralino with the second and third lightest ones, with the latter decaying into gauge bosons. We show that, depending on the value of tan β, the Higgs boson decay channel remains competitive with the direct production channel up to heavy Higgs boson masses of about 1 TeV. Moreover, this search is not limited by the same kinematic considerations as the ones in the direct production mode and can cover masses up to the kinematic threshold for the decay of the heavier electroweakinos into the lightest neutralino. This decay mode provides also an alternative way of looking for heavy Higgs bosons in this range of masses and hence should be a high priority for future LHC analyses.

scholarly journals STANDARD MODEL HIGGS COMBINED RESULT FROM CDF

2001 ◽  
Vol 16 (supp01b) ◽  
pp. 825-827
Author(s):  
◽  
JOÃO GUIMARÃES DA COSTA
Keyword(s):  
Standard Model ◽  
Cross Section ◽  
Z Boson ◽  
Decay Channel ◽  
Vector Boson ◽  
Associated Production ◽  
The Standard Model ◽  
The Individual ◽  
Cross Section Limit

The Tevatron is expected to be most sensitive to the Standard Model Higgs in its associated production with a W or Z boson. The Collider Detector at Fermilab (CDF) has performed individual searches for such production in each decay channel of the vector boson, assuming that the Higgs decays to [Formula: see text]. These searches use data collected by CDF during the 1992-95 run. The individual results are reviewed, and a combined cross section limit is presented.

scholarly journals Hypergeometric presentation for one-loop contributing to H → Z γ

2020 ◽  
Vol 2020 (5) ◽  
Author(s):  
Khiem Hong Phan ◽  
Dzung Tri Tran
Keyword(s):  
Hypergeometric Functions ◽  
Decay Channel ◽  
Form Factors ◽  
Space Time ◽  
Decay Process ◽  
Time Dimension ◽  
Higgs Decay ◽  
Arbitrary Space ◽  
First Time ◽  
Loop Form

Abstract In this paper, new analytic formulas for one-loop contributing to Higgs decay channel $H \rightarrow Z\gamma$ are presented in terms of hypergeometric functions. The calculations are performed by following the technique for tensor one-loop reduction developed in [A. I. Davydychev, Phys. Lett. B 263 (1991) 107]. For the first time, one-loop form factors for the decay process are shown which are valid at arbitrary space–time dimension $d$.

EFFECT FROM THE GLUON-FUSION SIGNAL AND BACKGROUND INTERFERENCE FOR HIGGS DECAYING TO γγ ANALYSIS AT THE LHC

2013 ◽  
Vol 28 (18) ◽  
pp. 1350081
Author(s):  
JUN-QUAN TAO ◽  
YU-QIAO SHEN ◽  
JIA-WEI FAN ◽  
HONG XIAO ◽  
GUO-MING CHEN ◽  
...  
Keyword(s):  
Decay Channel ◽  
Center Of Mass ◽  
Gluon Fusion ◽  
Destructive Interference ◽  
Interference Factor ◽  
Proton Proton ◽  
Higgs Decay ◽  
Mass Frame ◽  
Fusion Signal ◽  
8 Tev

We calculate the destructive interference factors between the Higgs decay H→γγ produced in gluon-fusion and the Standard Model (SM) continuum gg→γγ process, as a function of the scattering angle in the center-of-mass frame of the final two photons. The interference factors are studied with the selections based on the acceptance criteria of the ATLAS and CMS H→γγ searches at the LHC. The result shows that the destructive interference is only at an order of 2.5% for the SM Higgs analysis at the LHC. The factors are almost the same for the same Higgs mass hypothesis but with different proton–proton collisions at [Formula: see text], 8 TeV, 13 TeV and 14 TeV. The destructive interference is far below the present uncertainty on the total cross-section prediction of Higgs, which is about 15% used at the LHC. A destructive interference factor of -2.5% is suggested to be used in the H→γγ analysis at the LHC, due to the effect from the interference for this decay channel.

scholarly journals A golden probe of nonlinear Higgs dynamics

2020 ◽  
Vol 80 (9) ◽  
Author(s):  
Da Liu ◽  
Ian Low ◽  
Roberto Vega-Morales
Keyword(s):  
Higgs Boson ◽  
Decay Constant ◽  
Decay Channel ◽  
Shape Information ◽  
Fully Differential ◽  
Composite Higgs ◽  
Rate Information ◽  
Nonlinear Lagrangian ◽  
First Time ◽  
Future Sensitivity

AbstractThe most salient generic feature of a composite Higgs boson resides in the nonlinearity of its dynamics, which arises from degenerate vacua associated with the pseudo-Nambu–Goldstone (PNGB) nature of the Higgs boson. It has been shown that the nonlinear Higgs dynamics is universal in the IR and controlled only by a single parameter f, the decay constant of the PNGB Higgs. In this work we perform a fit, for the first time, to Wilson coefficients of $${\mathcal {O}}(p^4)$$ O ( p 4 ) operators in the nonlinear Lagrangian using the golden H $$\rightarrow $$ → 4L decay channel. By utilizing both the “rate” information in the signal strength and the “shape” information in the fully differential spectra, we provide limits on the Goldstone decay constant f, as well as $${\mathcal {O}}(p^4)$$ O ( p 4 ) Wilson coefficients, using Run 2 data at the LHC. In rate measurements alone, the golden channel prefers a negative $$\xi =v^2/f^2$$ ξ = v 2 / f 2 corresponding to a non-compact coset structure. Including the shape information, we identify regions of parameter space where current LHC constraint on f is still weak, allowing for $$\xi \lesssim 0.5$$ ξ ≲ 0.5 or $$\xi \gtrsim -0.5$$ ξ ≳ - 0.5 . We also comment on future sensitivity at the high-luminosity upgrade of the LHC which could allow for simultaneous fits to multiple Wilson coefficients.

scholarly journals Semi-leptonic three-body proton decay modes from light-cone sum rules

2021 ◽  
Vol 2021 (11) ◽  
Author(s):  
Ulrich Haisch ◽  
Amando Hala
Keyword(s):  
Light Cone ◽  
Decay Channel ◽  
Form Factors ◽  
Baryon Number ◽  
Proton Decay ◽  
Mass Scale ◽  
Effective Theory ◽  
Differential Rate ◽  
Neutrino Experiments ◽  
Three Body

AbstractUsing light-cone sum rule techniques, we estimate the form factors which parametrise the hadronic matrix elements that are relevant for semi-leptonic three-body proton decays. The obtained form factors allow us to determine the differential rate for the decay of a proton (p) into a positron (e+), a neutral pion (π0) and a graviton (G), which is the leading proton decay channel in the effective theory of gravitons and Standard Model particles (GRSMEFT). The sensitivity of existing and next-generation neutrino experiments in detecting the p → e+π0G signature is studied and the phenomenological implications of our computations for constraints on the effective mass scale that suppresses the relevant baryon-number violating GRSMEFT operator are discussed.

scholarly journals The Higgs potential in 2HDM extended with a real triplet scalar: A roadmap

2021 ◽  
pp. 2150131
Author(s):  
B. Ait-Ouazghour ◽  
M. Chabab
Keyword(s):  
Decay Channel ◽  
Higgs Doublet ◽  
Higgs Potential ◽  
Mixing Angle ◽  
Decay Modes ◽  
Higgs Decay ◽  
Clear Insight ◽  
Doublet Model ◽  
Two Higgs Doublet Model ◽  
Comprehensive Study

We perform a comprehensive study of the Higgs potential of the two Higgs doublet model extended by a real triplet scalar field [Formula: see text]. This model, dubbed [Formula: see text], has a rich Higgs spectrum consisting of three CP-even Higgs [Formula: see text], one CP-odd [Formula: see text] and two pairs of charged Higgs [Formula: see text]. First, we determine the perturbative unitarity constraints and a set of nontrivial conditions for the boundedness from below (BFB). Then we derive the Veltman conditions by considering the quadratic divergencies of Higgs boson self-energies in [Formula: see text]. We find that the parameter space is severely delimited by these theoretical constraints, as well as experimental exclusion limits and Higgs signal rate measurements at LEP and LHC. Using HiggsBounds-5.3.2beta and HiggSignals-2.2.3beta public codes, an exclusion test at [Formula: see text] is then performed on the physical scalars of [Formula: see text]. Our analysis provides a clear insight on the nonstandard scalar masses, showing that the allowed ranges are strongly sensitive to the sign of mixing angle [Formula: see text], essentially when naturalness is involved. For [Formula: see text] scenario, our results place higher limits on the bounds of all scalar masses, and show that the pairs [Formula: see text] and [Formula: see text] are nearly mass degenerate varying within the intervals [Formula: see text] GeV and [Formula: see text] GeV, respectively. When [Formula: see text] turns positive, we show that consistency with theoretical constraints and current LHC data, essentially on the diphoton decay channel, favors Higgs masses varying within wide allowed ranges: [Formula: see text] GeV for [Formula: see text]; [Formula: see text] GeV for ([Formula: see text], [Formula: see text]) and [Formula: see text] GeV for ([Formula: see text], [Formula: see text]). Finally, we find that the [Formula: see text] and [Formula: see text] Higgs decay modes are generally correlated if [Formula: see text] lies within the reduced intervals [Formula: see text] and [Formula: see text] parameter is frozen around [Formula: see text] ([Formula: see text]) for [Formula: see text] ([Formula: see text]).

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