Search for Production of Heavy Particles Decaying to Top Quarks and Invisible Particles in pp Collisions at {radical}(s)=1.96 TeV

We present a search for a new particle T{sup '} decaying to top quark via T{sup '}{yields}t+X, where X is an invisible particle. In a data sample with 4.8 fb{sup -1} of integrated luminosity collected by the CDF II detector at Fermilab in pp collisions with {radical}(s)=1.96 TeV, we search...

Full description

Saved in:
Bibliographic Details
Published in:Physical review letters 2011-05, Vol.106 (19)
Main Authors: Aaltonen, T., Brucken, E., Devoto, F., Mehtala, P., Orava, R., Alvarez Gonzalez, B., Casal, B., Cuevas, J., Gomez, G., Palencia, E., Rodrigo, T., Ruiz, A., Scodellaro, L., Vila, I., Vilar, R., Vizan, J., Amerio, S., Dorigo, T., Totaro, P., Amidei, D.
Format: Article
Language:English
Subjects:
BARYON-BARYON INTERACTIONS
ELEMENTARY PARTICLES
ENERGY RANGE
FERMILAB COLLIDER DETECTOR
FERMIONS
FIELD THEORIES
GEV RANGE
GEV RANGE 100-1000
GRAND UNIFIED THEORY
HADRON-HADRON INTERACTIONS
INTERACTIONS
LEPTONS
LUMINOSITY
MATHEMATICAL MODELS
MATTER
MEASURING INSTRUMENTS
NONLUMINOUS MATTER
NUCLEON-NUCLEON INTERACTIONS
OPTICAL PROPERTIES
PAIR PRODUCTION
PARTICLE INTERACTIONS
PARTICLE MODELS
PARTICLE PRODUCTION
PHYSICAL PROPERTIES
PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
POSTULATED PARTICLES
PROTON-NUCLEON INTERACTIONS
PROTON-PROTON INTERACTIONS
QUANTUM FIELD THEORY
QUARKS
RADIATION DETECTORS
STANDARD MODEL
T QUARKS
TEV RANGE
TEV RANGE 01-10
TOP PARTICLES
UNIFIED GAUGE MODELS
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We present a search for a new particle T{sup '} decaying to top quark via T{sup '}{yields}t+X, where X is an invisible particle. In a data sample with 4.8 fb{sup -1} of integrated luminosity collected by the CDF II detector at Fermilab in pp collisions with {radical}(s)=1.96 TeV, we search for pair production of T{sup '} in the lepton+jets channel, pp{yields}tt+X+X{yields}l{nu}bqq{sup '}b+X+X. We interpret our results primarily in terms of a model where T{sup '} are exotic fourth generation quarks and X are dark matter particles. Current direct and indirect bounds on such exotic quarks restrict their masses to be between 300 and 600 GeV/c{sup 2}, the dark matter particle mass being anywhere below m{sub T}{sup '}. The data are consistent with standard model expectations, and we set 95% confidence level limits on the generic production of T{sup '}T{sup '}{yields}tt+X+X. For the dark matter model we exclude T{sup '} at 95% confidence level up to m{sub T}{sup '}=360 GeV/c{sup 2} for m{sub X{
ISSN:0031-9007
1079-7114
DOI:10.1103/PHYSREVLETT.106.191801