Kaluza-Klein gravitino production with a single photon at e +e- colliders

Seungwon Baek, Seong Chan Park, Jeonghyeon Song

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

In a supersymmetric large extra dimension scenario, the production of Kaluza-Klein gravitinos accompanied by a photino at e+e- colliders is studied. We assume that a bulk supersymmetry is softly broken on our brane such that the low-energy theory resembles the MSSM. Low energy supersymmetry breaking is further assumed as in GMSB, leading to a sub-eV mass shift in each KK mode of the gravitino from the corresponding graviton KK mode. Since the photino decays within a detector due to the sufficiently large inclusive decay rate of γ̃ → γḠ, the process e +e- γ̃ Ḡ yields single photon events with missing energy. Even if the total cross section can be substantial at √s = 500 GeV, the KK graviton background of e+e-→ γG is kinematically advantageous and .thus much larger. It is shown that the observable ΔσLR = σ( can completely eliminate the KK graviton background but retain most of the KK gravitino signal, which provides a unique and robust method to probe the supersymmetric bulk.

Original languageEnglish
Article number056004
JournalPhysical Review D
Volume66
Issue number5
DOIs
Publication statusPublished - 2002 Dec 1

Fingerprint

gravitinos
gravitons
supersymmetry
photons
decay rates
energy
probes
shift
detectors
cross sections
decay

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)

Cite this

@article{d394c8c4b0af4e61bd15eb7315b5c01c,
title = "Kaluza-Klein gravitino production with a single photon at e +e- colliders",
abstract = "In a supersymmetric large extra dimension scenario, the production of Kaluza-Klein gravitinos accompanied by a photino at e+e- colliders is studied. We assume that a bulk supersymmetry is softly broken on our brane such that the low-energy theory resembles the MSSM. Low energy supersymmetry breaking is further assumed as in GMSB, leading to a sub-eV mass shift in each KK mode of the gravitino from the corresponding graviton KK mode. Since the photino decays within a detector due to the sufficiently large inclusive decay rate of γ̃ → γḠ, the process e +e- γ̃ Ḡ yields single photon events with missing energy. Even if the total cross section can be substantial at √s = 500 GeV, the KK graviton background of e+e-→ γG is kinematically advantageous and .thus much larger. It is shown that the observable ΔσLR = σ( can completely eliminate the KK graviton background but retain most of the KK gravitino signal, which provides a unique and robust method to probe the supersymmetric bulk.",
author = "Seungwon Baek and Park, {Seong Chan} and Jeonghyeon Song",
year = "2002",
month = "12",
day = "1",
doi = "10.1103/PhysRevD.66.056004",
language = "English",
volume = "66",
journal = "Physical Review D - Particles, Fields, Gravitation and Cosmology",
issn = "1550-7998",
number = "5",

}

Kaluza-Klein gravitino production with a single photon at e +e- colliders. / Baek, Seungwon; Park, Seong Chan; Song, Jeonghyeon.

In: Physical Review D, Vol. 66, No. 5, 056004, 01.12.2002.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Kaluza-Klein gravitino production with a single photon at e +e- colliders

AU - Baek, Seungwon

AU - Park, Seong Chan

AU - Song, Jeonghyeon

PY - 2002/12/1

Y1 - 2002/12/1

N2 - In a supersymmetric large extra dimension scenario, the production of Kaluza-Klein gravitinos accompanied by a photino at e+e- colliders is studied. We assume that a bulk supersymmetry is softly broken on our brane such that the low-energy theory resembles the MSSM. Low energy supersymmetry breaking is further assumed as in GMSB, leading to a sub-eV mass shift in each KK mode of the gravitino from the corresponding graviton KK mode. Since the photino decays within a detector due to the sufficiently large inclusive decay rate of γ̃ → γḠ, the process e +e- γ̃ Ḡ yields single photon events with missing energy. Even if the total cross section can be substantial at √s = 500 GeV, the KK graviton background of e+e-→ γG is kinematically advantageous and .thus much larger. It is shown that the observable ΔσLR = σ( can completely eliminate the KK graviton background but retain most of the KK gravitino signal, which provides a unique and robust method to probe the supersymmetric bulk.

AB - In a supersymmetric large extra dimension scenario, the production of Kaluza-Klein gravitinos accompanied by a photino at e+e- colliders is studied. We assume that a bulk supersymmetry is softly broken on our brane such that the low-energy theory resembles the MSSM. Low energy supersymmetry breaking is further assumed as in GMSB, leading to a sub-eV mass shift in each KK mode of the gravitino from the corresponding graviton KK mode. Since the photino decays within a detector due to the sufficiently large inclusive decay rate of γ̃ → γḠ, the process e +e- γ̃ Ḡ yields single photon events with missing energy. Even if the total cross section can be substantial at √s = 500 GeV, the KK graviton background of e+e-→ γG is kinematically advantageous and .thus much larger. It is shown that the observable ΔσLR = σ( can completely eliminate the KK graviton background but retain most of the KK gravitino signal, which provides a unique and robust method to probe the supersymmetric bulk.

UR - http://www.scopus.com/inward/record.url?scp=0036710895&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0036710895&partnerID=8YFLogxK

U2 - 10.1103/PhysRevD.66.056004

DO - 10.1103/PhysRevD.66.056004

M3 - Article

AN - SCOPUS:0036710895

VL - 66

JO - Physical Review D - Particles, Fields, Gravitation and Cosmology

JF - Physical Review D - Particles, Fields, Gravitation and Cosmology

SN - 1550-7998

IS - 5

M1 - 056004

ER -