Search for New Dielectron Resonances and Randall-Sundrum Gravitons at the Collider Detector at Fermilab

Aaltonen, T.; González, B.; Amerio, S.; Amidei, D.; Anastassov, A.; Annovi, A.; Antos̆, J.; Apollinari, G.; Appel, J. A.; Apresyan, A.; Arisawa, T.; Artikov, A.; Asaadi, J.; Ashmanskas, W.; Auerbach, B.; Aurisano, A.; Azfar, F.; Badgett, W.; Barbaro‐Galtieri, A.; Barnes, V. E.; Barnett, B. A.; Barria, P.; Bartoš, P.; Bauce, M.; Bauer, G.; Bedeschi, F.; Beecher, D.; Behari, S.; Bellettini, G.; Bellinger, J.; Benjamin, D.; Beretvas, A.; Bhatti, A.; Binkley, M.; Bisello, D.; Bizjak, I.; Bland, K. R.; Blumenfeld, B.; Bocci, A.; Bodek, A.; Bortoletto, D.; Boudreau, J.; Boveia, A.; Brau, B.; Brigliadori, L.; Brisuda, A.; Bromberg, C.; Brücken, E.; Bucciantonio, M.; Budagov, J.; Budd, H. 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doi:10.1103/physrevlett.107.051801

Cited by 22 publications

(13 citation statements)

References 18 publications

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“…Kaluza-Klein graviton (G KK ) excitations arising in the Randall-Sundrum (RS) model of extra spatial dimensions [3,19] involve a finite five-dimensional bulk that is warped as a function Table 1: Various benchmark models with their corresponding mixing angles, their branching fraction (B) to dileptons, the c u and c d parameter values and their ratio, and the width to mass ratio of the associated Z boson. [20][21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Search for high-mass resonances in dilepton final states in proton-proton collisions at $$ \sqrt{s}=13 $$ TeV

Sirunyan

Tumasyan

Adam

et al. 2018

J. High Energ. Phys.

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136

131

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A search is presented for new high-mass resonances decaying into electron or muon pairs. The search uses proton-proton collision data at a centre-of-mass energy of 13 TeV collected by the CMS experiment at the LHC in 2016, corresponding to an integrated luminosity of 36 fb −1 . Observations are in agreement with standard model expectations. Upper limits on the product of a new resonance production cross section and branching fraction to dileptons are calculated in a model-independent manner. This permits the interpretation of the limits in models predicting a narrow dielectron or dimuon resonance. A scan of different intrinsic width hypotheses is performed. Limits are set on the masses of various hypothetical particles. For the Z SSM (Z ψ ) particle, which arises in the sequential standard model (superstring-inspired model), a lower mass limit of 4.50 (3.90) TeV is set at 95% confidence level. The lightest Kaluza-Klein graviton arising in the Randall-Sundrum model of extra dimensions, with coupling parameters k/M Pl of 0.01, 0.05, and 0.10, is excluded at 95% confidence level below 2.10, 3.65, and 4.25 TeV, respectively. In a simplified model of dark matter production via a vector or axial vector mediator, limits at 95% confidence level are obtained on the masses of the dark matter particle and its mediator.• vector mediator with small couplings to leptons: g q = 0.1, g DM = 1.0, g = 0.01; • axial-vector mediator with equal couplings to quark and leptons: g DM = 1.0, g q = g = 0.1.Possible interference between the mediator of the dilepton process and the Drell-Yan (DY) background is well below 5% and can be safely neglected in the present analysis [26].

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Section: Introductionmentioning

confidence: 99%

Search for high-mass resonances in dilepton final states in proton-proton collisions at $$ \sqrt{s}=13 $$ TeV

Sirunyan

Tumasyan

Adam

et al. 2018

J. High Energ. Phys.

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136

131

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“…Soon after the discovery of the 125 GeV boson, these models with spin-2 non-universal coupling, have become important in the context of imposter to the Higgs boson [7][8][9]. This was necessary to extend the scope of spin-2 models as the experimental bounds on RS resonance (universal coupling) was much higher [10][11][12][13][14][15][16][17]. To NLO in QCD the UV and IR behaviour for the non-universal couplings for a spin-2, had been studied in the context of Higgs Characterisation [18].…”

Section: Introductionmentioning

confidence: 99%

Three loop form factors of a massive spin-2 particle with nonuniversal coupling

et al. 2017

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We investigate the interaction of spin-2 fields with those of the Standard Model in a model independent framework. We have considered interactions where the spin-2 fields couple to two sets of gauge invariant tensorial operators that are not conserved unlike the energy momentum tensor with different coupling strengths. Such interactions not only change the ultraviolet behaviour of the couplings but also expand the scope of the searches of spin-2 particles at the colliders. We present all the relevant renormalisation constants up to three loop level in QCD and also the form factors that contribute to potential observables. This sets the ground to investigate the phenomenological consequences of these interactions with spin-2 fields through more than one tensorial operator.

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“…Indirect constraints from LEP [33][34][35][36] have excluded Z ′ SSM bosons with mass less than 1.787 TeV [28]. Constraints on the mass of the RS graviton have been set by the ATLAS [37], CMS [32], CDF [38] and D0 [39] collaborations, excluding RS gravitons with a mass less than 2.14 TeV for k /M Pl = 0.1 [32]. A Z * with mass less than 1.152 TeV has been excluded by ATLAS [40].…”

Section: Jhep11(2012)138mentioning

confidence: 99%

Search for high-mass resonances decaying to dilepton final states in pp collisions at $ \sqrt{s}=7 $ TeV with the ATLAS detector

Aad¹,

Abajyan²,

Abbott³

et al. 2012

J. High Energ. Phys.

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Abstract:The ATLAS detector at the Large Hadron Collider is used to search for highmass resonances decaying to an electron-positron pair or a muon-antimuon pair. The search is sensitive to heavy neutral Z ′ gauge bosons, Randall-Sundrum gravitons, Z * bosons, techni-mesons, Kaluza-Klein Z/γ bosons, and bosons predicted by Torsion models. Results are presented based on an analysis of pp collisions at a center-of-mass energy of 7 TeV corresponding to an integrated luminosity of 4.9 fb −1 in the e + e − channel and 5.0 fb −1 in the µ + µ − channel. A Z ′ boson with Standard Model-like couplings is excluded at 95% confidence level for masses below 2.22 TeV. A Randall-Sundrum graviton with coupling k /M Pl = 0.1 is excluded at 95% confidence level for masses below 2.16 TeV. Limits on the other models are also presented, including Technicolor and Minimal Z ′ Models. Keywords: Hadron-Hadron ScatteringOpen Access, Copyright CERN, for the benefit of the ATLAS collaboration doi:10.1007/JHEP11(2012)138 10 Limits on spin-1 SSM and E 6 Z ′ bosons 13 JHEP11(2012)13811 Limits on spin-1 Z * bosons 1512 Limits on spin-2 Randall-Sundrum gravitons 1513 Limits on Torsion models 16 Limits on Technicolor 1715 Limits on spin-1 Kaluza-Klein S 1 /Z 2 bosons 2116 Limits on Minimal Z ′ bosons 22 Conclusions 23The ATLAS collaboration 30 IntroductionSearches for new resonances decaying to a dilepton final state have had a long and successful history. These channels contributed to the discovery of the quarkonium resonances J/ψ and Υ, as well as the discovery of the Z boson. Various models beyond the Standard Model (SM) contain additional bosons which can decay into dileptons, providing a fully -1 - JHEP11(2012)138reconstructable final state with small, well-understood backgrounds. In this article, data collected by the ATLAS experiment at the LHC are used to search for new resonances decaying into dielectron and dimuon final states. The Sequential Standard Model (SSM) [1] defines the Z ′ SSM couplings to SM fermions to be the same as the SM Z boson couplings and is often used in the literature as a benchmark model. A number of models predict additional neutral vector gauge bosons. One class postulates larger symmetry groups in which the SM gauge group is embedded. This is usually motivated by gauge unification or restoration of left-right symmetry, which is violated by the weak interaction. In one scheme, the SM gauge group derives from the E 6 group which, upon symmetry-breaking via the SU(5) subgroup, results in two additional U(1) gauge groups named U(1) χ and U(1) ψ with associated gauge bosons Z ′ χ and Z ′ ψ that can mix [1,2]. In the Minimal Z ′ Models [3,4], the phenomenology is controlled by only two effective coupling constants in addition to the Z ′ boson mass. This parameterization encompasses many models, including a left-right symmetric model [5,6] and the pure (B-L) model [7], where B (L) is the baryon (lepton) number, and B-L is the conserved quantum number.A second set of models is motivated by various solutions to the hiera...

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Search for New Dielectron Resonances and Randall-Sundrum Gravitons at the Collider Detector at Fermilab

Cited by 22 publications

References 18 publications

Search for high-mass resonances in dilepton final states in proton-proton collisions at $$ \sqrt{s}=13 $$ TeV

Search for high-mass resonances in dilepton final states in proton-proton collisions at $$ \sqrt{s}=13 $$ TeV

Three loop form factors of a massive spin-2 particle with nonuniversal coupling

Search for high-mass resonances decaying to dilepton final states in pp collisions at $ \sqrt{s}=7 $ TeV with the ATLAS detector

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