Abstract
In this paper we study the gauge mediation signal with the ATLAS detector at the CERN Large Hadron Collider. We focus on the case where next lightest supersymmetric particle is the long-lived lightest neutralino [Formula Presented] which decays predominantly into a photon [Formula Presented] and a gravitino [Formula Presented] A nonpointing photon from the neutralino decay can be detected with good position and time resolution by the electromagnetic calorimeter (ECAL), while the photon momentum could be precisely measured if the photon were converted inside the inner tracking detector before reaching the ECAL. A new technique is developed to determine the masses of the slepton [Formula Presented] and the neutralino from events with a lepton and a converted nonpointing photon arising from the cascade decay [Formula Presented] A Monte Carlo simulation at a sample point shows that the masses could be measured with an error of 3% for [Formula Presented] selected [Formula Presented] pairs. Once the sparticle masses are determined by this method, the decay time and momentum of the neutralino are solved using the ECAL data and the lepton momentum only, for all [Formula Presented] pairs without the photon conversion. We estimate the sensitivity to the neutralino lifetime for [Formula Presented] to [Formula Presented].
| Original language | English |
|---|---|
| Journal | Physical Review D - Particles, Fields, Gravitation and Cosmology |
| Volume | 69 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - Feb 23 2004 |
| Externally published | Yes |
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All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics
- Physics and Astronomy (miscellaneous)
Cite this
Study of the gauge mediation signal with nonpointing photons at the CERN LHC. / Kawagoe, Kiyotomo; Kobayashi, Tomio; Nojiri, Mihoko M.; Ochi, Atsuhiko.
In: Physical Review D - Particles, Fields, Gravitation and Cosmology, Vol. 69, No. 3, 23.02.2004.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Study of the gauge mediation signal with nonpointing photons at the CERN LHC
AU - Kawagoe, Kiyotomo
AU - Kobayashi, Tomio
AU - Nojiri, Mihoko M.
AU - Ochi, Atsuhiko
PY - 2004/2/23
Y1 - 2004/2/23
N2 - In this paper we study the gauge mediation signal with the ATLAS detector at the CERN Large Hadron Collider. We focus on the case where next lightest supersymmetric particle is the long-lived lightest neutralino [Formula Presented] which decays predominantly into a photon [Formula Presented] and a gravitino [Formula Presented] A nonpointing photon from the neutralino decay can be detected with good position and time resolution by the electromagnetic calorimeter (ECAL), while the photon momentum could be precisely measured if the photon were converted inside the inner tracking detector before reaching the ECAL. A new technique is developed to determine the masses of the slepton [Formula Presented] and the neutralino from events with a lepton and a converted nonpointing photon arising from the cascade decay [Formula Presented] A Monte Carlo simulation at a sample point shows that the masses could be measured with an error of 3% for [Formula Presented] selected [Formula Presented] pairs. Once the sparticle masses are determined by this method, the decay time and momentum of the neutralino are solved using the ECAL data and the lepton momentum only, for all [Formula Presented] pairs without the photon conversion. We estimate the sensitivity to the neutralino lifetime for [Formula Presented] to [Formula Presented].
AB - In this paper we study the gauge mediation signal with the ATLAS detector at the CERN Large Hadron Collider. We focus on the case where next lightest supersymmetric particle is the long-lived lightest neutralino [Formula Presented] which decays predominantly into a photon [Formula Presented] and a gravitino [Formula Presented] A nonpointing photon from the neutralino decay can be detected with good position and time resolution by the electromagnetic calorimeter (ECAL), while the photon momentum could be precisely measured if the photon were converted inside the inner tracking detector before reaching the ECAL. A new technique is developed to determine the masses of the slepton [Formula Presented] and the neutralino from events with a lepton and a converted nonpointing photon arising from the cascade decay [Formula Presented] A Monte Carlo simulation at a sample point shows that the masses could be measured with an error of 3% for [Formula Presented] selected [Formula Presented] pairs. Once the sparticle masses are determined by this method, the decay time and momentum of the neutralino are solved using the ECAL data and the lepton momentum only, for all [Formula Presented] pairs without the photon conversion. We estimate the sensitivity to the neutralino lifetime for [Formula Presented] to [Formula Presented].
UR - http://www.scopus.com/inward/record.url?scp=1642387800&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=1642387800&partnerID=8YFLogxK
U2 - 10.1103/PhysRevD.69.035003
DO - 10.1103/PhysRevD.69.035003
M3 - Article
AN - SCOPUS:1642387800
VL - 69
JO - Physical Review D - Particles, Fields, Gravitation and Cosmology
JF - Physical Review D - Particles, Fields, Gravitation and Cosmology
SN - 1550-7998
IS - 3
ER -