Collider implications of multiple nonuniversal extra dimensions

Ghavri, R.; McMullen, C. D.; Nandi, S.

doi:10.1103/physrevd.74.015012

Cited by 4 publications

(5 citation statements)

References 61 publications

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“…In addition, in many such models gauge interactions exist whose coupling with the third generation quarks and in particular to the top quark are enhanced. These include Kaluza-Klein (KK) excitations of the graviton [19,20,21] as well as the weak [22] and the strong gauge bosons [23,24,25,26,19,27,28,29,30] which couple to top quarks. Such particles could show up as resonances in the pp → X → t t production channel and not in other channels, like di-jets or di-leptons, due to their small couplings to light particles.…”

Section: Introductionmentioning

confidence: 99%

Top pair invariant mass distribution: a window on new physics

Frederix

Maltoni

2009

J. High Energy Phys.

170

191

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We explore in detail the physics potential of a measurement of the tt invariant mass distribution. First, we assess the accuracy of the best available predictions for this observable and find that in the low invariant mass region, the shape is very well predicted and could be used to perform a top mass measurement. Second, we study the effects of a heavy s-channel resonance on the tt invariant mass distribution in a model independent way. We provide the necessary Monte Carlo tools to perform the search and outline a simple three-step analysis.

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Section: Introductionmentioning

confidence: 99%

Top pair invariant mass distribution: a window on new physics

Frederix

Maltoni

2009

J. High Energy Phys.

170

191

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“…In addition, events are assumed to satisfy the cluster transverse mass cuts, Eqs. ( 13) and (17), and the invariant mass cuts of Eqs. ( 15), ( 16), ( 18) and (19).…”

Section: Discussionmentioning

confidence: 99%

“…17a, where, in addition to the jet invariant mass cut, we also impose the cluster transverse mass cut of Eq. (17). j top in the figure denotes the "t-jet" resulting from t → bjj.…”

Section: A Jet Invariant Mass Cutmentioning

confidence: 99%

“…The masses of these particles are typically in the TeV range. For example, topcolor [2,3] and Little Higgs [4][5][6] models predict weakly coupled new vector bosons, models with extra dimensions [7][8][9] can have Kaluza-Klein (KK) excitations of the graviton [10,11] the weak [9,12] and the strong gauge bosons [13][14][15][16][17][18][19][20] which couple to top quarks, while massive axial vector bosons appear in torsion gravity models [21]. Resonances in the t t channel also occur in technicolor [22,23], chiral color [24] and models with a strong SU(3) × SU(3) gauge symmetry [25,26].…”

Section: Introductionmentioning

confidence: 99%

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High p_T Top Quarks at the Large Hadron Collider

Baur,

Orr

2007

Preprint

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Many new physics models predict resonances with masses in the TeV range which decay into a pair of top quarks. With its large cross section, t t production at the Large Hadron Collider (LHC) offers an excellent opportunity to search for such particles. The identification of very energetic top quarks is crucial in such an analysis. We consider in detail the t t → ℓ ± νb bq q′ (ℓ = e, µ) final state for high p T top quarks. In this phase space region, two or more of the final state quarks can merge into a single jet due to the large Lorentz boost of the parent top quark. As a result, a large fraction of t t → ℓ ± νb bq q′ events with an invariant mass in the TeV region contains less than four observable jets. Requiring one or two tagged b-quarks, we calculate the W +jets, W b+jets, W b b+jets, W bt, and single top plus jets backgrounds for these final states, and identify cuts which help to suppress them. In particular, we discuss whether a cut on the jet invariant mass may be useful in reducing the background in the ℓν +2 jets channel. We also investigate how next-to-leading order QCD corrections affect high p T top quark production at the LHC. We find that the ℓν + 2 jets and ℓν + 3 jets final states with one or two b-tags will significantly improve the chances for discovering new heavy particles in the t t channel at the LHC.

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“…The masses of these particles are typically in the TeV range. For example, topcolor [2,3] and Little Higgs [4][5][6][7][8] models predict weakly coupled new vector bosons, models with extra dimensions [9][10][11] can have Kaluza-Klein (KK) excitations of the graviton [12,13], the weak [11,14,15], and the strong gauge bosons [16][17][18][19][20][21][22][23] which couple to top quarks, while massive axial vector bosons appear in torsion gravity models [24]. Resonances in the t " t channel also occur in technicolor [25,26], chiral color [27], and models with a strong SUð3Þ Â SUð3Þ gauge symmetry [28,29].…”

Section: Introductionmentioning

confidence: 99%

Searching fortt¯resonances at the CERN Large Hadron Collider

Baur

Orr

2008

Phys. Rev. D

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Many new physics models predict resonances with masses in the TeV range which decay into a pair of top quarks. With its large cross section, t " t production at the Large Hadron Collider (LHC) offers an excellent opportunity to search for such particles. We present a detailed study of the discovery potential of the CERN Large Hadron Collider for Kaluza-Klein (KK) excitations of the gluon in bulk Randall-We utilize final states with one or two tagged b-quarks, and two, three or four jets (including b-jets). Our calculations take into account the finite resolution of detectors, the energy loss due to b-quark decays, the expected reduced b-tagging at large t " t invariant masses, and include the background originating from Wb " b þ jets, ðWb þ W " bÞ þ jets, W þ jets, and single top þ jets production. We derive semirealistic 5 discovery limits for nine different KK gluon scenarios, and compare them with those for KK gravitons, and a Z H boson in the Littlest Higgs model. We also analyze the capabilities of the LHC experiments to differentiate between individual KK gluon models and measure the couplings of KK gluons to quarks. We find that, for the parameters and models chosen, KK gluons with masses up to about 4 TeV can be discovered at the LHC. The ability of the LHC to discriminate between different bulk RS models, and to measure the couplings of the KK gluons is found to be highly model dependent.

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Collider implications of multiple nonuniversal extra dimensions

Cited by 4 publications

References 61 publications

Top pair invariant mass distribution: a window on new physics

Top pair invariant mass distribution: a window on new physics

High p_T Top Quarks at the Large Hadron Collider

Searching fortt¯resonances at the CERN Large Hadron Collider

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