Direct photon pair production at the LHC to in TeV scale gravity models

Kumar, M. C.; Mathews, Prakash; Ravindran, V.; Tripathi, Anurag

doi:10.1016/j.nuclphysb.2009.03.022

Cited by 59 publications

(45 citation statements)

References 49 publications

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“…Its value is 0.91 at 2 TeV and slowly increases up to 1.15 at 250 GeV. A different K-factor is applied to the G * signal, with values that vary between 1.6 and 1.8 depending on the graviton mass and k /M Pl [62], 2 and with a value of 1.75 above 750 GeV, consistent with ref. [37].…”

Section: Jhep11(2012)138supporting

confidence: 76%

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.

109

137

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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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Section: Jhep11(2012)138supporting

confidence: 76%

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.

109

137

View full text Add to dashboard Cite

show abstract

“…These results for the K-factor were provided by the authors of Refs. [38,39], using updated calculations at ffiffi ffi s p ¼ 8 TeV. Given these theory predictions for σ × BRðG Ã → γγÞ, the upper limits on σ ×BRðG Ã →γγÞ from Table IV do not take into account any theory uncertainties in the prediction of σ × BRðG Ã → γγÞ for the RS signal.…”

Section: Resultsmentioning

confidence: 99%

Search for high-mass diphoton resonances inppcollisions ats=8 TeVwith the ATLAS detector

Aad¹,

Abbott²,

Abdallah³

et al. 2015

Phys. Rev. D

116

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This article describes a search for high-mass resonances decaying to a pair of photons using a sample of 20.3 fb −1 of pp collisions at ffiffi ffi s p ¼ 8 TeV recorded with the ATLAS detector at the Large Hadron Collider.The data are found to be in agreement with the Standard Model prediction, and limits are reported in the framework of the Randall-Sundrum model. This theory leads to the prediction of graviton states, the lightest of which could be observed at the Large Hadron Collider. A lower limit of 2.66 (1.41) TeV at 95% confidence level is set on the mass of the lightest graviton for couplings of k=M Pl ¼ 0.1 (0.01).

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“…At hadron colliders, QCD corrections to these processes are necessary to make precise quantitative predictions and to have control over the theoretical uncertainties. To next-to-leading-order (NLO) accuracy, these processes have been studied in the context of ADD [5][6][7][8][9][10] and RS [11][12][13][14][15]. The effect of parton shower (PS) has also been considered [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

The two-loop QCD correction to massive spin-2 resonance $$ \rightarrow q \bar{q} g $$ → q q ¯ g

et al. 2016

Self Cite

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The two-loop QCD correction to massive spin-2 graviton decaying to q +q + g is presented considering a generic universal spin-2 coupling to the SM through the conserved energy-momentum tensor. Such a massive spin-2 particle can arise in extra-dimensional models. The ultraviolet and infrared structure of the QCD amplitudes are studied. In dimensional regularization, the infrared pole structure is in agreement with Catani's proposal, confirming the universal factorization property of QCD amplitudes, even with the spin-2 tensorial coupling.

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Direct photon pair production at the LHC to in TeV scale gravity models

Cited by 59 publications

References 49 publications

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

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

Search for high-mass diphoton resonances inppcollisions ats=8 TeVwith the ATLAS detector

The two-loop QCD correction to massive spin-2 resonance $$ \rightarrow q \bar{q} g $$ → q q ¯ g

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