R-parity violation at hadron colliders

Dreiner, Herbert K.; Ross, Graham G.

doi:10.1016/0550-3213(91)90443-2

Cited by 185 publications

(189 citation statements)

References 18 publications

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“…Due to the possible changes in the spectrum as well as the additional interactions, the decay patterns of the supersymmetric particles can change, see for example Ref. [50].…”

Section: The P6-violating Mssmmentioning

confidence: 99%

Mass spectrum in R-parity violating minimal supergravity and benchmark points

et al. 2007

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We investigate in detail the low-energy spectrum of the R-parity violating minimal supergravity model using the computer program SOFTSUSY. We impose the experimental constraints from the measurement of the anomalous magnetic moment of the muon, (g − 2)µ, the decay b → sγ as well as the mass bounds from direct searches at colliders, in particular on the Higgs boson and the lightest chargino. We also include a new calculation for the R parity violating contribution to Br(Bs → µ + µ − ). We then focus on cases where the lightest neutralino is not the lightest supersymmetric particle (LSP). In this region of parameter space either the lightest scalar tau (stau) or the scalar tau neutrino (tau sneutrino) is the LSP. We suggest four benchmark points with typical spectra and novel collider signatures for detailed phenomenological analysis and simulation by the LHC collaborations.

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“…Due to the possible changes in the spectrum as well as the additional interactions, the decay patterns of the supersymmetric particles can change, see for example Ref. [50].…”

Section: The P6-violating Mssmmentioning

confidence: 99%

Mass spectrum in R-parity violating minimal supergravity and benchmark points

et al. 2007

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“…Stable sneutrinos ν are strongly disfavored as LSP candidates, by a combination of constraints from Z decay [2] that nowadays give massm ν > ∼ M Z /2 [3] and galactic dark-matter searches that together exclude the range 4 GeV <m ν < 1 TeV [4,5]. But in the presence of R-parity violation (RPV) [6,7,8,9,10] the LSP can be unstable and sneutrinos are credible candidates once more; indeed the literature contains examples of SUSY-GUT parameter sets that lead to sneutrinos as LSP, either without [11] or with [12] RPV effects in the evolution equations. In the present paper we discuss and calculate the SUSY signals that will arise at an e + e − collider from the SUSY threshold process e + e − →ν ανα (α = e, µ, τ ),…”

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confidence: 99%

Possible sneutrino-pair signatures with R-parity breaking

1995

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If sneutrinos are the lightest supersymmetry partners and R-parity is not conserved, the process e + e − →νν can have striking signatures due to the decay modes ν → ℓ + ℓ ′− orν → qq ′ . We present cross section formulas and discuss event rates and detection at the upgraded e + e − collider LEP. Four-lepton signals should be detectable up to sneutrino massm ν = 80 GeV and maybe beyond; four-jet signals should be detectable up tom ν = 70 GeV, but would probably be obscured thereafter by W W background.Searches for supersymmetry (SUSY) particles depend considerably on the identity of the lightest SUSY partner (LSP), usually believed to be a neutralino [1]. if approximately degenerate sneutrinosν α are the LSP and decay by RPV processes. We ignore single-SUSY-particle production [7,10], that can in principle take place with a lower threshold via RPV interactions, because the latter are either known [7,8] or suspected to have much much smaller couplings than the gauge couplings which control Eq.(1).Sneutrino pair production proceeds via t-channel exchange of charginos χ+ R → ν eν e only) and via s-channel Z exchange, that together give the helicity amplitudesHere θ is the CM polar scattering angle, m χ + i are the chargino masses (i = 1 is the lightest), while cos 2 γ R is the mixing probability of the wino component in the lightest chargino; β = 1 − 4m 2 ν /s is the sneutrino CM velocity, s and t are the usual invariant squares of energy and momentum transfer, θ W is the weak angle. The differential cross section is then defined by dσ/d cos θ = Σ|M| 2 β/(128πs); we note that it contains an overall factor sin 2 θ , favoring wide angles with good experimental acceptance, well away from the beam-pipe. as in many models). We note thatν eνe production is considerably enhanced aboveν µνµ andν τντ production, due to the chargino-exchange contribution (with constructive interference). Adding all three flavors, Fig.1 indicates about 500 (75) events per 100 pb −1 luminosity at √ s = 190 GeV, form ν = 50 (80) GeV, which should be enough to establish a clear signal in this mass range and possibly beyond, modulo detection efficiency and background questions discussed below.If a sneutrino is the LSP, it can only decay by RPV. With the particle content of the minimal SUSY-SM (MSSM), the most general gauge-and SUSY-invariant Lagrangian includes the following terms that can mediate sneutrino decays[6]where L i and E λ ijk ⇒ν i → ℓ

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“…(i) it is strong enough for the neutralino decays to be inside the detector (≥ 10 −6 for 100 GeV sparticles and scaled accordingly for higher masses [47], in the case that we do not have any additional effects from phase space suppressions);…”

Section: Jhep07(2011)070mentioning

confidence: 99%

Flavour structure of R-violating neutralino decays at the LHC

Bomark

Choudhury

Lola

et al. 2011

J. High Energ. Phys.

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Abstract:We study signatures of R-parity violation in the production of supersymmetric particles at the LHC, and the subsequent decay of the lightest neutralino being the end product of a supersymmetric cascade decay. In doing so, we pay particular attention to the possible flavour structure of the operators, and how one may discriminate between different possibilities. A neutralino LSP would couple to all quarks and leptons and a comparative study of its decays provides an optimal channel for the simultaneous study of all 45 R-violating operators. By studying the expected signals from all these operators, we demonstrate the ability to understand whether more than one coupling dominates, and to map the experimental signatures to operator hierarchies that can then be compared against theoretical models of flavour. Detailed comparisons with backgrounds, including those from MSSM cascade decays are made, using the PYTHIA event simulator.

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R-parity violation at hadron colliders

Cited by 185 publications

References 18 publications

Mass spectrum in R-parity violating minimal supergravity and benchmark points

Mass spectrum in R-parity violating minimal supergravity and benchmark points

Possible sneutrino-pair signatures with R-parity breaking

Flavour structure of R-violating neutralino decays at the LHC

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