Discrimination of supersymmetry and universal extra dimensions at hadron colliders

Datta, AseshKrishna; Kong, Kyoungchul; Matchev, K.

doi:10.1103/physrevd.72.096006

Cited by 156 publications

(83 citation statements)

References 76 publications

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“…We then study the extent to which decay correlations, manifest in the invariant mass distributions of combinations of observable decay products, would enable one to distinguish between the different possible spin assignments of the new particles. This paper is thus an extension of earlier work in which the SUSY decay correlations were compared with uncorrelated phase space [1,2] or with those of a model that has universal extra dimensions (UED) 1 [4,5,6,7,8,9].…”

Section: Introductionmentioning

confidence: 99%

Distinguishing spins in decay chains at the large hadron collider

Athanasiou¹,

Lester²,

Smillie³

et al. 2006

J. High Energy Phys.

145

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If new particles are discovered at the LHC, it will be important to determine their spins in as model-independent a way as possible. We consider the case, commonly encountered in models of physics beyond the Standard Model, of a new scalar or fermion D decaying sequentially into other new particles C, B, A via the decay chain D → Cq, C → Bl near , B → Al far , l near and l far being opposite-sign same-flavour charged leptons and A being invisible. We compute the observable 2-and 3-particle invariant mass distributions for all possible spin assignments of the new particles, and discuss their distinguishability using a quantitative measure known as the Kullback-Leibler distance.

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Section: Introductionmentioning

confidence: 99%

Distinguishing spins in decay chains at the large hadron collider

Athanasiou¹,

Lester²,

Smillie³

et al. 2006

J. High Energy Phys.

145

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show abstract

“…Classic examples of such theories include supersymmetric models with R-parity, universal extra dimensions [1], and Little Higgs models with T -parity [2]. Typically, the cascade decays in these models lead to observable events with up to four leptons and missing transverse energy [3,4].…”

Section: Introductionmentioning

confidence: 99%

Leptons and photons at the LHC: cascades through spinless adjoints

Dobrescu

Kong

Mahbubani

2007

J. High Energy Phys.

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Abstract:We study the hadron collider phenomenology of (1,0) Kaluza-Klein modes along two universal extra dimensions compactified on the chiral square. Cascade decays of spinless adjoints proceed through tree-level 3-body decays involving leptons as well as one-loop 2-body decays involving photons. As a result, spectacular events with as many as six charged leptons, or one photon plus four charged leptons are expected to be observed at the LHC. Unusual events with relatively large branching fractions include three leptons of same charge plus one lepton of opposite charge, or one photon plus two leptons of same charge. We estimate the current limit from the Tevatron on the compactification scale, set by searches for trilepton events, to be around 270 GeV.

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“…The results presented here are confirmation of extension of this phenomenon to nondegenerate mass spectrum which has not been shown quantitatively so far. In spite of the fact that both models show similar signatures in hadron colliders in hadron colliders there are attempts to distinguish one from another [38]. For instance, new particles in both models differ by their spin quantum number.…”

Section: Resultsmentioning

confidence: 99%