Single-photon signal from neutralinos at LEP2

The production of invisible pairs of lightest neutralinos accompanied by a large-angle hard photon in the reaction e^+ e^- \to \chi^0_1 \chi^0_1 \gamma is studied at LEP2 energies. The most general gaugino/higgsino composition of the \chi^0_1 within the Minimal Supersymmetric Standard Model is assum...

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Autores principales: Ambrosanio, S., Mele, B., Montagna, G., Nicrosini, O., Piccinini, F.
Lenguaje:eng
Publicado: 1996
Materias:
Particle Physics - Phenomenology
Acceso en línea:https://dx.doi.org/10.1016/0550-3213(96)00421-X
http://cds.cern.ch/record/294445
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author Ambrosanio, S.
Mele, B.
Montagna, G.
Nicrosini, O.
Piccinini, F.
author_facet Ambrosanio, S.
Mele, B.
Montagna, G.
Nicrosini, O.
Piccinini, F.
author_sort Ambrosanio, S.
collection CERN
description The production of invisible pairs of lightest neutralinos accompanied by a large-angle hard photon in the reaction e^+ e^- \to \chi^0_1 \chi^0_1 \gamma is studied at LEP2 energies. The most general gaugino/higgsino composition of the \chi^0_1 within the Minimal Supersymmetric Standard Model is assumed. The spectrum of the observed photon is derived within the framework of the p_t-dependent structure-function approach, whose accuracy is assessed to be within the foreseen experimental accuracy at LEP2. Higher-order QED corrections due to undetected initial-state radiation are also included. A comparison with the Standard Model main background from e^+ e^- \to \nu \bar \nu \gamma is performed for optimized photon kinematical cuts. Quantitative conclusions on the signal/background ratio are given for a wide range of values of the SUSY parameters.
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institution Organización Europea para la Investigación Nuclear
language eng
publishDate 1996
record_format invenio
spelling cern-2944452023-03-14T19:56:11Zdoi:10.1016/0550-3213(96)00421-Xhttp://cds.cern.ch/record/294445engAmbrosanio, S.Mele, B.Montagna, G.Nicrosini, O.Piccinini, F.Single-photon signal from neutralinos at LEP2Particle Physics - PhenomenologyThe production of invisible pairs of lightest neutralinos accompanied by a large-angle hard photon in the reaction e^+ e^- \to \chi^0_1 \chi^0_1 \gamma is studied at LEP2 energies. The most general gaugino/higgsino composition of the \chi^0_1 within the Minimal Supersymmetric Standard Model is assumed. The spectrum of the observed photon is derived within the framework of the p_t-dependent structure-function approach, whose accuracy is assessed to be within the foreseen experimental accuracy at LEP2. Higher-order QED corrections due to undetected initial-state radiation are also included. A comparison with the Standard Model main background from e^+ e^- \to \nu \bar \nu \gamma is performed for optimized photon kinematical cuts. Quantitative conclusions on the signal/background ratio are given for a wide range of values of the SUSY parameters.The production of invisible pairs of lightest neutralinos accompanied by a large-angle hard photon in the reaction $e~+ e~- \to \chi~0_1 \chi~0_1 \gamma$ is studied at LEP2 energies. The most general gaugino/higgsino composition of the $\chi~0_1$ within the Minimal Supersymmetric Standard Model is assumed. The spectrum of the observed photon is derived within the framework of the $p_t$-dependent structure-function approach, whose accuracy is assessed to be within the foreseen experimental accuracy at LEP2. Higher-order QED corrections due to undetected initial-state radiation are also included. A comparison with the Standard Model main background from $e~+ e~- \to \nu \bar \nu \gamma$ is performed for optimized photon kinematical cuts. Quantitative conclusions on the signal/background ratio are given for a wide range of values of the SUSY parameters.The production of invisible pairs of lightest neutralinos accompanied by a large-angle hard photon in the reaction $e~+ e~- \to \chi~0_1 \chi~0_1 \gamma$ is studied at LEP2 energies. The most general gaugino/higgsino composition of the $\chi~0_1$ within the Minimal Supersymmetric Standard Model is assumed. The spectrum of the observed photon is derived within the framework of the $p_t$-dependent structure-function approach, whose accuracy is assessed to be within the foreseen experimental accuracy at LEP2. Higher-order QED corrections due to undetected initial-state radiation are also included. A comparison with the Standard Model main background from $e~+ e~- \to \nu \bar \nu \gamma$ is performed for optimized photon kinematical cuts. Quantitative conclusions on the signal/background ratio are given for a wide range of values of the SUSY parameters.The production of invisible pairs of lightest neutralinos accompanied by a large-angle hard photon in the reaction $e~+ e~- \to \chi~0_1 \chi~0_1 \gamma$ is studied at LEP2 energies. The most general gaugino/higgsino composition of the $\chi~0_1$ within the Minimal Supersymmetric Standard Model is assumed. The spectrum of the observed photon is derived within the framework of the $p_t$-dependent structure-function approach, whose accuracy is assessed to be within the foreseen experimental accuracy at LEP2. Higher-order QED corrections due to undetected initial-state radiation are also included. A comparison with the Standard Model main background from $e~+ e~- \to \nu \bar \nu \gamma$ is performed for optimized photon kinematical cuts. Quantitative conclusions on the signal/background ratio are given for a wide range of values of the SUSY parameters.The production of invisible pairs of lightest neutralinos accompanied by a large-angle hard photon in the reaction $e~+ e~- \to \chi~0_1 \chi~0_1 \gamma$ is studied at LEP2 energies. The most general gaugino/higgsino composition of the $\chi~0_1$ within the Minimal Supersymmetric Standard Model is assumed. The spectrum of the observed photon is derived within the framework of the $p_t$-dependent structure-function approach, whose accuracy is assessed to be within the foreseen experimental accuracy at LEP2. Higher-order QED corrections due to undetected initial-state radiation are also included. A comparison with the Standard Model main background from $e~+ e~- \to \nu \bar \nu \gamma$ is performed for optimized photon kinematical cuts. Quantitative conclusions on the signal/background ratio are given for a wide range of values of the SUSY parameters.The production of invisible pairs of lightest neutralinos accompanied by a large-angle hard photon in the reaction e + e − → χ 1 0 χ 1 0 γ is studied at LEP2 energies. The most general gaugino/higgsino composition of the χ 1 0 within the Minimal Supersymmetric Standard Model is assumed. The spectrum of the observed photon is derived within the framework of the p t -dependent structure-function approach, whose accuracy is assessed to be within the foreseen experimental accuracy at LEP2. Higher-order QED corrections due to undetected initial-state radiation are also included. A comparison with the Standard Model main background from e + e − → ν ν γ is performed for optimized photon kinematical cuts. Quantitative conclusions on the signal/ background ratio are given for a wide range of values of the SUSY parameters.hep-ph/9601292FNT-T-95-32ROME1-1126-95FTN-T-95-32ROMA-1-1126oai:cds.cern.ch:2944451996-01-18
spellingShingle Particle Physics - Phenomenology
Ambrosanio, S.
Mele, B.
Montagna, G.
Nicrosini, O.
Piccinini, F.
Single-photon signal from neutralinos at LEP2
title Single-photon signal from neutralinos at LEP2
title_full Single-photon signal from neutralinos at LEP2
title_fullStr Single-photon signal from neutralinos at LEP2
title_full_unstemmed Single-photon signal from neutralinos at LEP2
title_short Single-photon signal from neutralinos at LEP2
title_sort single-photon signal from neutralinos at lep2
topic Particle Physics - Phenomenology
url https://dx.doi.org/10.1016/0550-3213(96)00421-X
http://cds.cern.ch/record/294445
work_keys_str_mv AT ambrosanios singlephotonsignalfromneutralinosatlep2
AT meleb singlephotonsignalfromneutralinosatlep2
AT montagnag singlephotonsignalfromneutralinosatlep2
AT nicrosinio singlephotonsignalfromneutralinosatlep2
AT piccininif singlephotonsignalfromneutralinosatlep2

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