Probing<i>R</i>-parity violating models of neutrino mass at the Fermilab Tevatron via top squark decays

Das, S.; Datta, Amitava; Guchait, M.

doi:10.1103/physrevd.70.015009

Cited by 12 publications

(64 citation statements)

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“…However, the situation is dramatically different if all of the mentioned above decay modes are not kinematically allowed and stop is the NLSP, there will be competition between two types of RPC decays [10,11]:…”

Section: Supersymmetric Models and R-parity Violation (Rpv)mentioning

confidence: 99%

“…On the other hand, the existing data on neutrino mass oscillations sets very strict limits on RPV couplings [5,6,11,12,28,29], and constrains them to be in the range λ i33 < 10 −3 ∼ 10 −5 . The spread in predictions come from use of different soft SUSY breaking mechanisms, various approaches in simplifying the RPV parameters set or using different RPV anzats, or electroweak basis choice.…”

Section: Supersymmetric Models and R-parity Violation (Rpv)mentioning

confidence: 99%

“…Theoretical studies indicate that there are regions of SUSY model parameters [8,9,10], including the region allowed by neutrino oscillation data [11,12], where the decay mode for the light stopt 1 →τ b is dominant one. However, there is also part of the parameters space that favorst 1 → eb andt 1 → µb decays overt 1 → τ b [11,12].…”

Section: Supersymmetric Models and R-parity Violation (Rpv)mentioning

confidence: 99%

“…Within the framework of R / p SUSY [4,5], theoretical studies indicate that the decay mode for the light stopt 1 →τ b is dominant for a wide range of SUSY model parameters [8,9,10], including the region favored by neutrino oscillation data [11,12]. It should be noted that lepton number is violated in neutrino oscillations, and RPV SUSY theories with lepton number violation provide a natural explaination for this phenomenon as well as for neutrino mass generation, which gives a strong motivation for RPV searches.…”

Section: A Introductionmentioning

confidence: 99%

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Search for pair production of scalar top quarks decaying to aτ lepton and a b quark in 1.96 TeV p$\bar{p}$ collisions

Khotilovich¹

2008

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I present the results of a search for pair production of scalar top quarks (t 1 ) in an R-parity violating supersymmetric scenario using 322 pb −1 of pp collisions at √ s = 1.96 TeV collected by the upgraded Collider Detector at Fermilab. I assume eacht 1 decays into a τ lepton and a b quark, with branching ratio β, and search for final states containing either an electron or a muon from a leptonic τ decay, a hadronically decaying τ lepton, and two or more jets. Two candidate events pass my final selection criteria, consistent with the expectation from standard model processes.I present upper limits on the cross section times branching ratio squared σ(t 1t1 ) × β 2 as a function of the stop mass m(t 1 ). Assuming β = 1, I set a 95% confidence level limit m(t 1 ) > 153 GeV/c 2 . These limits are also fully applicable to the case of a pair produced third generation scalar leptoquark that decays into a τ lepton and a b quark.

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Section: Supersymmetric Models and R-parity Violation (Rpv)mentioning

confidence: 99%

Section: Supersymmetric Models and R-parity Violation (Rpv)mentioning

confidence: 99%

Section: Supersymmetric Models and R-parity Violation (Rpv)mentioning

confidence: 99%

Section: A Introductionmentioning

confidence: 99%

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Search for pair production of scalar top quarks decaying to aτ lepton and a b quark in 1.96 TeV p$\bar{p}$ collisions

Khotilovich¹

2008

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“…These features as well as the possible interplay between the LHC and the LC to pin down RPV SUSY as the origin of neutrino mass need to be studied. Finally we note that if the λ ′ couplings are indeed O(10 −4 ) as required by models of ν mass [53], lighter top squark decays may provide additional evidence in favour of these models [58] …”

Section: Probing R-parity Violating Models Of Neutrino Mass At the LImentioning

confidence: 99%

Working group report: High energy and collider physics

et al. 2004

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This is a summary of the projects undertaken by the Working Group I on High Energy Collider Physics at the Eighth Workshop on High Energy Physics Phenomenology (WHEPP8) held at the Indian Institute of Technology, Mumbai, January 5-16, 2004. The topics covered are (i) Higgs searches (ii) supersymmetry searches (iii) extra dimensions and (iv) linear collider.The projects undertaken in the Working Group I on High Energy and Collider Physics can be classified into the categories (i) Higgs searches (ii) supersymmetry searches (iii) extra dimensions and (iv) linear collider. The reports on the projects are given below under these headings.1 Higgs searches Potential of Associated Higgs Production in LHC throughτ -pair modeParticipants: P.Agrawal and K.Mazumdar 1 At LHC, the Standard Model Higgs production in association with W-boson, pp → W H is very interesting, though in general the total production rate is dominated by gluon-gluon fusion process. There is a strong indication that the Higgs boson is not very heavy and the experimental search for Higgs mass, m H ≤ 150 GeV/c 2 is comparatively more difficult. In any case it is desirable to study all possibilities for detection of Higgs boson in this mass range to strengthen the significance of discovery via 'golden' modes. This has motivated us to probe less studied modes of Higgs boson decays via WH production. Once the Higgs boson is discovered at LHC these final states will have to be studied for confirmation anyway.The LHC experiments, both CMS and ATLAS, have special trigger algorithm at the first level (LEVEL 1) based on calorimetric information for selecting hadronic decays of τ in the final state [1]. The tau-decay modes of Supersymmetric Higgs bosons have been particularly studied for this purpose. The narrowness of a jet as in the case of hadronic tau decays has been utilised in discrimenating the transverse profile of jets. The tracker information is used at a later stage for decision at a higher level and hence leptonic decays of τ cannot be used for trigger. Of course the leptonic decays of W-boson (only electron and muon final states) can be chosen for trigger in inclusive isolated electron/muon mode. But the background is likely to be overwhelming in that case. Hence we try the possibility of triggering the signal with the taus from the Higgs decay. This situation can be effectively utilised for the decay mode H → τ + τ − in the Higgs boson mass range m H ≤ 140 GeV/c 2 where the branching ratio is not too small, though below 10%. According to the 'trigger menu' of CMS experiment there are two possibilities for events with at least one τ in the final state. For 95% efficiency of signal selection (SUSY Higgs decay to tau final state) the kinematic thresholds are as follows. 1.Inclusive τ -jet with jet transverse energy ≥ 86 GeV. 2. Double τ -jets with the transverse energy of each jet ≥ 59 GeV. It remains to be checked through simulation the efficiency in the signal channel after these requirements. We need to study the spectrum of transverse momen...

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Rare weak decays and direct lepton number violating signals in a minimalR-parity violating model of neutrino mass

et al. 2005

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Within the framework of R-parity violating minimal supergravity model, at least three relatively large lepton-number violating λ ′ type trilinear couplings at the GUT scale, not directly related to neutrino physics, can naturally generate via renormalization group (RG) 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 RG 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 may lead to spectacular low energy signatures like rare weak decays of the τ 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 (LSP), all with sizable branching ratios. Several low background signals at the Tevatron and 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 GUT scale, i.e., the origin of neutrino masses and mixing angles, can be identified.

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ProbingR-parity violating models of neutrino mass at the Fermilab Tevatron via top squark decays

Cited by 12 publications

References 82 publications

Search for pair production of scalar top quarks decaying to aτ lepton and a b quark in 1.96 TeV p$\bar{p}$ collisions

Search for pair production of scalar top quarks decaying to aτ lepton and a b quark in 1.96 TeV p$\bar{p}$ collisions

Working group report: High energy and collider physics

Rare weak decays and direct lepton number violating signals in a minimalR-parity violating model of neutrino mass

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