Deciphering the spin of new resonances in Higgsless models

Physical review D: Particles and fields (Impact Factor: 4.86). 10/2008; 79(3). DOI: 10.1103/PhysRevD.79.035009
Source: arXiv


We study the potential of the CERN Large Hadron Collider (LHC) to probe the spin of new massive vector boson resonances predicted by Higgsless models. We consider its production via weak boson fusion which relies only on the coupling between the new resonances and the weak gauge bosons. We show that the LHC will be able to unravel the spin of the particles associated with the partial restoration of unitarity in vector boson scattering for integrated luminosities of 150-560 fb^-1, depending on the new state mass and on the method used in the analyses. Comment: 7 pages, 4 figures. Version published in Physical Review D

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    • "Therefore, immediately after the discovery of new particles the question will arise how to discriminate between the various models and spin determination will play a crucial role here. The question on how to determine the spin of new particles has been addressed by several authors: in [1] [2] [3] [4] [5] s-channel resonances have been investigated and in [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] spectra of cascade decays of subsequent two-body decays have been used to obtain information on the spin. An additional possibility to get information on the spin is cross section measurements provided one knows the representation of the particle produced [20], e.g. "
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    ABSTRACT: Determining the spin of new particles is an important tool for discriminating models beyond the Standard Model. We show that in case of cascades of subsequent two body decays the existing strategy to extract the spin from lepton and quark spectra can be used without changes even if one allows for dim-5 and dim-6 operators which might be induced by physics just beyond the reach of LHC. We show analytically that these operators do not change the overall structure of these spectra.
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    • "These models differ in the spins of the predicted new particles and, thus, one has to develop methods to get information on the spin. First attempts have been made for s-channel resonances [1] [2] [3] [4] and in case of subsequent two-body decays of the new particles [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] where in many cases model dependent assumptions had been made. An additional possibility to get information on the spin is cross section measurements provided one knows the representation of the particle produced [18], e.g. "
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    ABSTRACT: The identification of the correct model for physics beyond the Standard Model requires the determination of the spin of new particles. We investigate to which extent the spin of a new particle $X$ can be identified in scenarios where it decays dominantly in three-body decays $X\to f\bar{f} Y$. Here we assume that $Y$ is a candidate for dark matter and escapes direct detection at a high energy collider such as the LHC. We show that in the case that all intermediate particles are heavy, one can get information on the spins of $X$ and $Y$ at the LHC by exploiting the invariant mass distribution of the two standard model fermions. We develop a model-independent strategy to determine the spins without prior knowledge of the unknown couplings and test it in a series of Monte Carlo studies. Comment: 31+1 pages, 4 figures, 8 tables, JHEP.cls included
    Journal of High Energy Physics 05/2010; 2010(8). DOI:10.1007/JHEP08(2010)053 · 6.11 Impact Factor
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    • "In most cases, the effects of the particles spins on experimentally-accessible distributions are small, but various analyses have been proposed [11] [12] [13] [14] [15] [16] [17] [18] [19] [20] [21] [22] [23] [24] [25] [26] [27] [28] [29] [30] [31] which indicate sensitivity to spins in a variety of cascade decays. Angular correlations in variables other than cascade decays have also been studied [32] [33] [34] [35] [36] [37]. A separate review article on the subject of spin determination methods has recently been published [38] and we refer the reader to that article for more details. "
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    ABSTRACT: We review the methods which have been proposed for measuring masses of new particles at the Large Hadron Collider paying particular attention to the kinematical techniques suitable for extracting mass information when invisible particles are expected.
    Journal of Physics G Nuclear and Particle Physics 04/2010; 37(12). DOI:10.1088/0954-3899/37/12/123001 · 2.78 Impact Factor
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