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Title: New signals of an R-parity violating model of neutrino mass at the Fermilab Tevatron

Abstract

In a variety of models of neutrino masses and mixings the lighter top squark decays into competing R-parity violating and R-parity conserving channels. Using PYTHIA we have estimated in a model independent way the minimum value of P{identical_to}BR(t-tilde){sub 1}{yields}c{chi}-tilde{sub 1}{sup 0})xBR(t-tilde){sub 1}{yields}l{sub i}{sup +}b), where l{sub i}=e{sup +} and {mu}{sup +}, corresponding to an observable signal involving the final state 1l+jets+Ee{sub T} (carried by the neutrinos from the {chi}-tilde{sub 1}{sup 0} decay) at Tevatron Run II. For the kinematical cuts designed in this paper P depends on m{sub t-tilde{sub 1}} only. We then compute P for representative choices of the model parameters constrained by the oscillation data and find that over a significant region of the allowed parameter space P is indeed larger than P{sub min}. This signal is complementary to the dilepton+dijet signal studied in several earlier experimental and phenomenological analyses and may be observed even if BR(t-tilde){sub 1}{yields}l{sub i}{sup +}b) is an order of magnitude smaller than BR(t-tilde{sub 1}{yields}c{chi}-tilde{sub 1}{sup 0}). The invariant mass distribution of the hardest lepton and the hardest jet may determine m{sub t-tilde{sub 1}} and reveal the lepton number violating nature of the underlying interaction. The invariant mass distribution of the two lowest energymore » jets may determine m{sub {chi}}{sub -tilde{sub 1}{sup 0}}.« less

Authors:
;  [1]
  1. Department of Physics, Jadavpur University, Kolkata- 700 032 (India)
Publication Date:
OSTI Identifier:
21020307
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. D, Particles Fields; Journal Volume: 75; Journal Issue: 7; Other Information: DOI: 10.1103/PhysRevD.75.075013; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; CONSERVATION LAWS; FERMILAB TEVATRON; JET MODEL; LEPTON NUMBER; MASS DISTRIBUTION; MUONS PLUS; NEUTRINO OSCILLATION; NEUTRINOS; PARITY; PARTICLE DECAY; POSITRONS; PROTON-PROTON INTERACTIONS; REST MASS; SPARTICLES; SYMMETRY

Citation Formats

Datta, Amitava, and Poddar, Sujoy. New signals of an R-parity violating model of neutrino mass at the Fermilab Tevatron. United States: N. p., 2007. Web. doi:10.1103/PHYSREVD.75.075013.
Datta, Amitava, & Poddar, Sujoy. New signals of an R-parity violating model of neutrino mass at the Fermilab Tevatron. United States. doi:10.1103/PHYSREVD.75.075013.
Datta, Amitava, and Poddar, Sujoy. Sun . "New signals of an R-parity violating model of neutrino mass at the Fermilab Tevatron". United States. doi:10.1103/PHYSREVD.75.075013.
@article{osti_21020307,
title = {New signals of an R-parity violating model of neutrino mass at the Fermilab Tevatron},
author = {Datta, Amitava and Poddar, Sujoy},
abstractNote = {In a variety of models of neutrino masses and mixings the lighter top squark decays into competing R-parity violating and R-parity conserving channels. Using PYTHIA we have estimated in a model independent way the minimum value of P{identical_to}BR(t-tilde){sub 1}{yields}c{chi}-tilde{sub 1}{sup 0})xBR(t-tilde){sub 1}{yields}l{sub i}{sup +}b), where l{sub i}=e{sup +} and {mu}{sup +}, corresponding to an observable signal involving the final state 1l+jets+Ee{sub T} (carried by the neutrinos from the {chi}-tilde{sub 1}{sup 0} decay) at Tevatron Run II. For the kinematical cuts designed in this paper P depends on m{sub t-tilde{sub 1}} only. We then compute P for representative choices of the model parameters constrained by the oscillation data and find that over a significant region of the allowed parameter space P is indeed larger than P{sub min}. This signal is complementary to the dilepton+dijet signal studied in several earlier experimental and phenomenological analyses and may be observed even if BR(t-tilde){sub 1}{yields}l{sub i}{sup +}b) is an order of magnitude smaller than BR(t-tilde{sub 1}{yields}c{chi}-tilde{sub 1}{sup 0}). The invariant mass distribution of the hardest lepton and the hardest jet may determine m{sub t-tilde{sub 1}} and reveal the lepton number violating nature of the underlying interaction. The invariant mass distribution of the two lowest energy jets may determine m{sub {chi}}{sub -tilde{sub 1}{sup 0}}.},
doi = {10.1103/PHYSREVD.75.075013},
journal = {Physical Review. D, Particles Fields},
number = 7,
volume = 75,
place = {United States},
year = {Sun Apr 01 00:00:00 EDT 2007},
month = {Sun Apr 01 00:00:00 EDT 2007}
}
  • Within the framework of an R-parity violating minimal supergravity model, at least three relatively large lepton number violating {lambda}{sup '} type trilinear couplings at the grand unified theory scale, not directly related to neutrino physics, can naturally generate via renormalization group evolution and/or CKM rotation, the highly suppressed bilinear and trilinear parameters at the weak scale required to explain the neutrino oscillation data. The structure of the renormalization group equations and the CKM matrix restrict the choices of the three input couplings to only eight possible combinations, each with its own distinctive experimental signature. The relatively large input couplings maymore » lead to spectacular low-energy signatures like rare weak decays of the {tau} lepton and K mesons, direct lepton number violating decays of several sparticles, and unconventional decay modes (and reduced lifetime) of the lightest neutralino, assumed to be the lightest supersymmetric particle, all with sizable branching ratios. Several low background signals at the Tevatron and CERN LHC have been suggested and their sizes are estimated to be at the observable level. From the particle content of the signal and the relative rate of different final states the input couplings at the grand unified theory scale, i.e., the origin of neutrino masses and mixing angles, can be identified.« less
  • We investigate a neutrino mass model in which the neutrino data is accounted for by bilinear R-parity violating supersymmetry with anomaly mediated supersymmetry breaking. We focus on the CERN Large Hadron Collider (LHC) phenomenology, studying the reach of generic supersymmetry search channels with leptons, missing energy and jets. A special feature of this model is the existence of long-lived neutralinos and charginos which decay inside the detector leading to detached vertices. We demonstrate that the largest reach is obtained in the displaced vertices channel and that practically all of the reasonable parameter space will be covered with an integrated luminositymore » of 10 fb{sup -1}. We also compare the displaced vertex reaches of the LHC and Tevatron.« less
  • We discuss single top quark production via u{sup i}{bar d}{sup j}{r_arrow}t{bar b} at the Fermilab Tevatron in the minimal supersymmetric model with R-parity violation. We find that within the allowed range of coupling constants, the lepton-number-violating couplings can give rise to observable effects when the slepton mass lies in a specific narrow range. For the baryon-number-violating couplings, the contribution to the production rate can be quite large in the presently allowed range of the coupling constants. We show that the measurement of single top quark production at the upgraded Tevatron can be used to constrain a linear combination of productsmore » of the R-parity-violating couplings. {copyright} {ital 1997} {ital The American Physical Society}« less
  • The like sign dileptons provide the most promising signature for superparticle search in a large category of {ital R}-parity-violating SUSY models. We estimate the like sign dilepton signals at the Fermilab Tevatron collider, predicted by these models, over a wide region of the MSSM parameter space. One expects an unambiguous signal up to a gluino mass of 200{endash}300 GeV ({ge}500 GeV) with the present (proposed) accumulated luminosity of {approximately}0.1(1) fb{sup {minus}1}. {copyright} {ital 1996 The American Physical Society.}
  • The expected trilepton signals from [ital p[bar p]][r arrow][chi][sub 1][sup [plus minus]][chi][sub 2][sup 0][r arrow]([chi][sub 1][sup 0][ital l][sup [plus minus]][nu]) ([chi][sub 1][sup 0][ital l][prime][sup +][ital l][prime][sup [minus]]) will be converted into hadronically quiet multilepton signals, if the two final [chi][sub 1][sup 0] have leptonic [ital R]-parity-violating (RPV) decays [chi][sub 1][sup 0][r arrow][ital ll][prime][nu]. We make illustrative calculations of the acceptance for these spectacular RPV signals, and point out that distinctive multilepton signals are possible even when the [ital R]-conserving trilepton signals are blocked by the spoiler mode'' [chi][sub 2][sup 0][r arrow][ital h][sup 0][chi][sub 1][sup 0]. Other channels such as [italmore » p[bar p]][r arrow][chi][sub 1][sup [plus minus]][chi][sub 2][sup 0][r arrow]([chi][sub 1][sup 0][ital l][sup [plus minus]][nu])([chi][sub 1][sup 0][nu][nu]), [ital p[bar p]][r arrow][chi][sub 1][sup [plus minus]][chi][sub 1][sup 0][r arrow]([chi][sub 1][sup 0][ital l][nu])[chi][sub 1][sup 0], and [ital p[bar p]][r arrow][chi][sub 1][sup +][chi][sub 1][sup [minus]][r arrow]([chi][sub 1][sup 0][ital l][sup +][nu])([chi][sub 1][sup 0][ital l][prime][sup [minus]][nu]) can also give quiet multileptons from RPV. We investigate these signals in the context of supersymmetric models with radiative electroweak symmetry breaking, using examples in the low-tan [beta][lambda][sub [ital t]] fixed-point region.« less