Effects of large extra dimensions on associated tth{sup 0} production at linear colliders

Journal Article · Fri Apr 01 04:00:00 EST 2005 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PhysRevD.71.075005· OSTI ID:20709004

Hao, Sun; Renyou, Zhang; Peijun, Zhou; Yi, Jiang; Liang, Han ^[1]; Wengan, Ma ^[2]

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1. Department of Modern Physics, University of Science and Technology of China (USTC), Hefei, Anhui 230027 (China)
2. CCAST (World Laboratory), P.O. Box 8730, Beijing 100080 (China)

In the framework of the large extra-dimensions (LED) model, the effects of LED on the processes {gamma}{gamma}{yields}tth{sup 0} and e{sup +}e{sup -}{yields}tth{sup 0} at future linear colliders are investigated in both polarized and unpolarized collision modes. The results show that the virtual Kaluza-Klein graviton exchange can significantly modify the standard model expectations for these processes with certain polarizations of initial states. The process {gamma}{gamma}{yields}tth{sup 0} with {radical}(s)=3.5 TeV allows the effective scale {lambda}{sub T} to be probed up to 7.8 and 8.6 TeV in the unpolarized and P{sub {gamma}}=0.9, J=2 polarized {gamma}{gamma} collision modes, respectively. For the e{sup +}e{sup -}{yields}tth{sup 0} process with {radical}(s)=3.5 TeV, the upper limits of {lambda}{sub T} to be observed can be 6.7 and 7.0 TeV in the unpolarized and P{sub e{sup +}}=0.6, P{sub e{sup -}}=0.8, -+ polarized e{sup +}e{sup -} collision modes, respectively. We find the {gamma}{gamma}{yields}tth{sup 0} channel in J=2 polarized photon collision mode provides a possibility to improve the sensitivity to the graviton tower exchange.

• OSTI ID: 20709004
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 7 Vol. 71; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ELECTRON-POSITRON INTERACTIONS
GRAVITONS
HIGGS BOSONS
KALUZA-KLEIN THEORY
LINEAR COLLIDERS
PARTICLE PRODUCTION
PHOTON-PHOTON INTERACTIONS
PHOTONS
POLARIZATION
SENSITIVITY
STANDARD MODEL
T QUARKS
TEV RANGE