Search for Large Extra Dimensions in the Production of Jets and Missing Transverse Energy in p p ¯ Collisions at s = 1.96 TeV

Università di Pisa, Pisa, Tuscany, Italy
Physical Review Letters (Impact Factor: 7.51). 11/2006; 97(17):171802. DOI: 10.1103/PhysRevLett.97.171802
Source: PubMed


We present the results of a search for new physics in the jets plus missing transverse energy data sample collected from 368 pb(-1) of pp collisions at square root of s = 1.96 TeV recorded by the Collider Detector at Fermilab. We compare the number of events observed in the data with a data-based estimate of the standard model backgrounds contributing to this signature. We observe no significant excess of events, and we interpret this null result in terms of lower limits on the fundamental Planck scale for a large extra dimensions scenario.

10 Reads
  • [Show abstract] [Hide abstract]
    ABSTRACT: This talk reviews the present searches for elementary particles which may constitute dark matter: axions, light massive neutrinos and Weakly Interacting Massive Particles (WIMPs). In particular, it discusses in some detail the experimental challenges of the search for WIMPs and describes the experimental strategies being pursued. Taking as an example the recent results obtained at Berkeley with a 60 g detector simultaneously measuring the phonon and ionization components, it attempts to assess the prospects of the new cryogenic detection techniques.
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: The field equations and boundary conditions of Horava-Witten theory, compactified on a smooth compact spin quotient of CH^3, where CH^3 denotes the hyperbolic cousin of CP^3, are studied in the presence of Casimir energy density terms. If the Casimir energy densities near one boundary result in a certain constant of integration taking a value greater than around 10^5 in units of the d = 11 gravitational length, a form of thick pipe geometry is found that realizes TeV-scale gravity by the ADD mechanism, with that boundary becoming the inner surface of the thick pipe, where we live. Three alternative ways in which the outer surface of the thick pipe might be stabilized consistent with the observed value of the effective d = 4 cosmological constant are considered. In the first alternative, the outer surface is stabilized in the classical region and the constant of integration is fixed at around 10^{13} in units of the d = 11 gravitational length for consistency with the observed cosmological constant. In the second alternative, the four observed dimensions have reduced in size down to the d = 11 gravitational length at the outer surface, and there are Casimir effects near the outer surface. In the third alternative, the outer surface is stabilized in the classical region by extra fluxes of the three-form gauge field, whose four-form field strength wraps three-cycles of the compact six-manifold times the radial dimension of the thick pipe. Some problems related to fitting the strong/electroweak Standard Model are considered.
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: We consider the phenomenology of the decay of a Z boson into a photon and a Kaluza–Klein excitation of the graviton in the ADD model. Using LEP data, we obtain an upper bound on the branching ratio corresponding to this process of ∼10-11. We also investigate energy profiles of the process.
    European Physical Journal C 04/2008; 55(1):107-112. DOI:10.1140/epjc/s10052-008-0583-9 · 5.08 Impact Factor
Show more