Limits...
Search for invisible particles produced in association with single-top-quarks in proton-proton collisions at [Formula: see text] with the ATLAS detector.

- Eur Phys J C Part Fields (2015)

Bottom Line: No deviation from the standard model prediction is observed, and upper limits are set on the production cross-section for resonant and non-resonant production of an invisible exotic state in association with a right-handed top quark.In the case of resonant production, for a spin-[Formula: see text] resonance with a mass of [Formula: see text] GeV, an effective coupling strength above [Formula: see text] is excluded at 95[Formula: see text] confidence level for the top quark and an invisible spin-[Formula: see text] state with mass between [Formula: see text] and [Formula: see text] GeV.In the case of non-resonant production, an effective coupling strength above [Formula: see text] is excluded at 95[Formula: see text] confidence level for the top quark and an invisible spin-[Formula: see text] state with mass between [Formula: see text] and [Formula: see text] GeV.

View Article: PubMed Central - PubMed

Affiliation: CPPM, Aix-Marseille Université and CNRS/IN2P3, Marseille, France.

ABSTRACT

A search for the production of single-top-quarks in association with missing energy is performed in proton-proton collisions at a centre-of-mass energy of [Formula: see text] with the ATLAS experiment at the large hadron collider using data collected in 2012, corresponding to an integrated luminosity of [Formula: see text] fb[Formula: see text]. In this search, the [Formula: see text] boson from the top quark is required to decay into an electron or a muon and a neutrino. No deviation from the standard model prediction is observed, and upper limits are set on the production cross-section for resonant and non-resonant production of an invisible exotic state in association with a right-handed top quark. In the case of resonant production, for a spin-[Formula: see text] resonance with a mass of [Formula: see text] GeV, an effective coupling strength above [Formula: see text] is excluded at 95[Formula: see text] confidence level for the top quark and an invisible spin-[Formula: see text] state with mass between [Formula: see text] and [Formula: see text] GeV. In the case of non-resonant production, an effective coupling strength above [Formula: see text] is excluded at 95[Formula: see text] confidence level for the top quark and an invisible spin-[Formula: see text] state with mass between [Formula: see text] and [Formula: see text] GeV.

No MeSH data available.


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Observed and expected limits on the cross section times branching ratio (left) for the resonant model with  GeV and (right) for the non-resonant model, as a function of the mass of  and , respectively. The predicted signal cross-sections for different coupling strengths are also shown
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Fig6: Observed and expected limits on the cross section times branching ratio (left) for the resonant model with  GeV and (right) for the non-resonant model, as a function of the mass of and , respectively. The predicted signal cross-sections for different coupling strengths are also shown

Mentions: Figure 6 shows the expected and observed 95 % CL excluded cross-section times branching ratio as a function of the mass of the invisible state, for each of the two signal models. In the case of the resonant model, cross-sections corresponding to an effective coupling strength are excluded in the whole mass range, but not cross-sections corresponding to . For the non-resonant model, cross-sections corresponding to (, ) are excluded up to  GeV ( GeV,  GeV).Table 2


Search for invisible particles produced in association with single-top-quarks in proton-proton collisions at [Formula: see text] with the ATLAS detector.

- Eur Phys J C Part Fields (2015)

Observed and expected limits on the cross section times branching ratio (left) for the resonant model with  GeV and (right) for the non-resonant model, as a function of the mass of  and , respectively. The predicted signal cross-sections for different coupling strengths are also shown
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

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getmorefigures.php?uid=PMC4376466&req=5

Fig6: Observed and expected limits on the cross section times branching ratio (left) for the resonant model with  GeV and (right) for the non-resonant model, as a function of the mass of and , respectively. The predicted signal cross-sections for different coupling strengths are also shown
Mentions: Figure 6 shows the expected and observed 95 % CL excluded cross-section times branching ratio as a function of the mass of the invisible state, for each of the two signal models. In the case of the resonant model, cross-sections corresponding to an effective coupling strength are excluded in the whole mass range, but not cross-sections corresponding to . For the non-resonant model, cross-sections corresponding to (, ) are excluded up to  GeV ( GeV,  GeV).Table 2

Bottom Line: No deviation from the standard model prediction is observed, and upper limits are set on the production cross-section for resonant and non-resonant production of an invisible exotic state in association with a right-handed top quark.In the case of resonant production, for a spin-[Formula: see text] resonance with a mass of [Formula: see text] GeV, an effective coupling strength above [Formula: see text] is excluded at 95[Formula: see text] confidence level for the top quark and an invisible spin-[Formula: see text] state with mass between [Formula: see text] and [Formula: see text] GeV.In the case of non-resonant production, an effective coupling strength above [Formula: see text] is excluded at 95[Formula: see text] confidence level for the top quark and an invisible spin-[Formula: see text] state with mass between [Formula: see text] and [Formula: see text] GeV.

View Article: PubMed Central - PubMed

Affiliation: CPPM, Aix-Marseille Université and CNRS/IN2P3, Marseille, France.

ABSTRACT

A search for the production of single-top-quarks in association with missing energy is performed in proton-proton collisions at a centre-of-mass energy of [Formula: see text] with the ATLAS experiment at the large hadron collider using data collected in 2012, corresponding to an integrated luminosity of [Formula: see text] fb[Formula: see text]. In this search, the [Formula: see text] boson from the top quark is required to decay into an electron or a muon and a neutrino. No deviation from the standard model prediction is observed, and upper limits are set on the production cross-section for resonant and non-resonant production of an invisible exotic state in association with a right-handed top quark. In the case of resonant production, for a spin-[Formula: see text] resonance with a mass of [Formula: see text] GeV, an effective coupling strength above [Formula: see text] is excluded at 95[Formula: see text] confidence level for the top quark and an invisible spin-[Formula: see text] state with mass between [Formula: see text] and [Formula: see text] GeV. In the case of non-resonant production, an effective coupling strength above [Formula: see text] is excluded at 95[Formula: see text] confidence level for the top quark and an invisible spin-[Formula: see text] state with mass between [Formula: see text] and [Formula: see text] GeV.

No MeSH data available.


Related in: MedlinePlus