Observation of single isolated electrons of high transverse momentum in events with missing transverse energy at the CERN p collider

Banner, M.; Zeller, W.; Bonaudi, Franco; Borghini, M.; Möllerud, R.; Pastore, F.; Hansen, P. H.; Vercesi, V.; Gaillard, J. M.; Mansoulié, B.; Nilsson, B.S.; Parrour, G.; Teiger, J.; Hungerbühler, V.; Steiner, H.; Borer, K.; Livan, M.; Sauvage, G.; Mani, P.; Jenni, P.; Dorsaz, P.A.; Goggi, V. G.; Stimpfl, G.; Himel, T.; Chollet, J.C.; Rothenberg, A.; Siegrist, J.; Onions, C.; Loucatos, S.; Madsen, B.; Bloch, P.; Roussarie, A.; Froidevaux, D.; Repellin, J. P.; Plothow‐Besch, H.; Polverel, M.; Gildemeister, O.; Fayard, L.; Stocker, F.; Hänni, H.; Zaccone, H.; Fraternali, M.; Dines-Hansen, J.; Lella, L. Di; Battiston, R.; Mapelli, L.; Mantovani, G.; Conta, C.; Clark, A.; Hahn, B.; Grote, H.; Weidberg, A. R.; Schacher, J.; Hansen, J. R.; Kofoed‐Hansen, O.; Mermikides, M.; Merkel, B.; Lançon, E.; Darriulat, P.

doi:10.1016/0370-2693(83)91605-2

Cited by 561 publications

(184 citation statements)

References 14 publications

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“…We see that even if the stop is as light as mt 1 ∼ 120 GeV, the maximum possible increase would give us κ γγ ≈ 1.2. However due to the lack of W-boson in the loop for gg → h, the stop effect here 5 The maximum value of m h displayed in Figure 4.3(b) occurs for Xt/MSUSY slightly smaller than √ 6 as it is calculated at two loops, where the maximal mixing value is slightly smaller and closer to 2.…”

Section: Stop Quark Effectsmentioning

confidence: 75%

“…Since this time it has achieved remarkable success with the discovery, as predicted by the model of the tau lepton [1] along with the charm [2,3] and bottom quarks [4] in the 1970s, the W and Z bosons in the 1980s [5][6][7], the top quark in the 1990s [8] and the tau neutrino in 2000 [9]. The final particle in the standard model, the Higgs boson was discovered at CERN in July 2012 [10,11], completing the set of particles predicted by the SM.…”

Section: The Standard Modelmentioning

confidence: 99%

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Beyond Standard Model Collider Phenomenology of Higgs Physics and Supersymmetry

Thomas¹

2016

Springer Theses

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In this thesis I study the collider phenomenology of BSM physics at the LHC, concentrating on the Higgs boson and supersymmetery. The implications and effects on cross sections of the loss of unitarity in scattering processes involving multiple vector bosons and/or the Higgs, when the Higgs couplings to the W and the Z are non-SM, is studied using an effective Lagrangian. Subsequently methods to remove unwanted background from transversely polarised vector bosons are explored, which enable an estimation of the potential to measure the Higgs couplings to weak bosons in a model-independent way via vector boson fusion. MSSM effects on Higgs production and decay are also considered, concentrating on the effects due to light stops, sbottoms and staus. Amongst other things, we find that light 3 rd generation squarks generally produce asymmetrical alteration in signal strengths of different production channels, generally causing µ V BF µ ggF > 1. Finally we extend some ATLAS analyses in the low ∆m = mt − mχ0 1 region, extending the excluded masses of light stops. This enables us to limit the maximum effects of light stops on the Higgs, and further limits the parameter space where the light stop scenario of electroweak baryogenesis is viable.

show abstract

Section: Stop Quark Effectsmentioning

confidence: 75%

Section: The Standard Modelmentioning

confidence: 99%

Beyond Standard Model Collider Phenomenology of Higgs Physics and Supersymmetry

Thomas¹

2016

Springer Theses

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show abstract

“…The existence of a new resonance such as J/ψ mesons [1,2], W bosons [3,4], Z bosons [5,6], top quarks [7,8], and the recently discovered Higgs boson [9,10], was all confirmed by clear excesses or a resonance peak in the invariant or transverse mass distribution. Most new physics searches at the Large Hadron Collider (LHC) are also focused primarily on excesses.…”

Section: Introductionmentioning

confidence: 99%

Dip or nothingness of a Higgs resonance from the interference with a complex phase

2015

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We show that new resonance shapes -a pure dip, nothingness and an enhanced pure peakcan be produced from the interference between resonance and continuum with a relative phase. Production conditions of those new shapes are derived based on a general parameterization of the interference. The narrow width approximation is modified to work with the non-zero imaginary part of interference, and the correction factor can characterize the resonance shape. We demonstrate that the new resonance shapes of heavy Higgs bosons, H 0 and A 0 in the Type II aligned two Higgs doublet model, generally show up in gg → H 0 /A 0 → tt as well as bb and γγ channels. The pure A 0 resonance dip in the tt channel is a particularly interesting signal as it can be probed well by the current search techniques that do not even take into account interferences; the high-luminosity LHC 14 TeV can perhaps probe a large part of its parameter space.

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“…As no statistically significant signal is observed, we set a 95% confidence level upper limit on the relative branching fraction Γ(W ± → π ± γ)/Γ(W ± → e ± ν) at 6.4 × 10 −5 , a factor of 10 improvement over the previous limit. Since their discovery by the UA1 [1] and UA2 [2] experiments, the properties and decays of the massive mediators of the electroweak interaction, the W and Z vector bosons, have been studied extensively. The vector bosons decay predominantly into a pair of a quark and an antiquark, whose hadronization results in final states with two or more jets.…”

mentioning

confidence: 99%

Search for the rare radiative decayW→πγinpp¯collisions ats=
Aaltonen¹,
González²,
Amerio³
et al. 2012
Phys. Rev. D
7
0
7
0
View full text Add to dashboard Cite

Observation of single isolated electrons of high transverse momentum in events with missing transverse energy at the CERN p collider

Cited by 561 publications

References 14 publications

Beyond Standard Model Collider Phenomenology of Higgs Physics and Supersymmetry

Beyond Standard Model Collider Phenomenology of Higgs Physics and Supersymmetry

Dip or nothingness of a Higgs resonance from the interference with a complex phase

Search for the rare radiative decayW→πγinpp¯collisions ats=
Aaltonen¹,
González²,
Amerio³
et al. 2012
Phys. Rev. D
7
0
7
0
View full text Add to dashboard Cite

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Observation of single isolated electrons of high transverse momentum in events with missing transverse energy at the CERN p collider

Cited by 561 publications

References 14 publications

Beyond Standard Model Collider Phenomenology of Higgs Physics and Supersymmetry

Beyond Standard Model Collider Phenomenology of Higgs Physics and Supersymmetry

Dip or nothingness of a Higgs resonance from the interference with a complex phase

Search for the rare radiative decayW→πγinpp¯collisions ats=Aaltonen1, González2, Amerio3 et al. 2012Phys. Rev. D7070View full textAdd to dashboardCite

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Search for the rare radiative decayW→πγinpp¯collisions ats=
Aaltonen¹,
González²,
Amerio³
et al. 2012
Phys. Rev. D
7
0
7
0
View full text Add to dashboard Cite