Search for new heavy charged gauge bosons

The Tevatron proton-antiproton collider at Fermilab (near Chicago/USA) is operating at a center-of-mass energy of 1.96 TeV since March 2001. This analysis uses data taken with the D0 detector until February 2006 corresponding to an integrated luminosity of about 1 inverse femtobarn. Using this dataset, a search for a new heavy charged gauge boson W' and its subsequent decay into an electron and a neutrino is performed. Additional gauge bosons (including the equivalent to the Z, the Z') are introduced in many extensions to the Standard Model of particle physics. Assuming the most general case, the new gauge group can comprise a new mixing angle and new couplings. Here, the Altarelli Reference Model is considered which represents a generalization of the Manifest Left-Right Symmetric Model with light right-handed neutrinos. This model makes the assumptions that the new gauge boson W' has the same couplings as the Standard Model W boson and that there is no mixing. Hence, the W' is a heavy copy of the Standard Model W boson. The clear decay signature (in analogy to the decay of the W) contains an isolated electron with extreme high energy which is important for triggering. The neutrino can not be detected, but it gives rise to missing energy in the detector. The Jacobian peak in the transverse mass distribution stemming from the W decay is used for calibration, whereas the tail of the transverse mass distribution is searched for a possible W' signal. The data agrees with the expectation from background processes. For instance, in the data 37 events are reconstructed with transverse masses above 300 GeV compared to a prediction of 37.1 +/- 2.1 (stat) (+6.0)/(-3.7) (sys) background events. Since no significant excess is found in the data, an upper limit is set on the production cross section for heavy charged gauge bosons decaying into electron and neutrino. Using this limit, a lower bound on the mass of the new gauge boson can be derived at the 95% confidence level, m(W') > 1002 GeV.

Grantor dc:publisher

Publikationsserver der RWTH Aachen University

Year dc:date

2007

Author dc:creator

• Magaß, Carsten

Contributors dc:contributor

• Hebbeker, Thomas

• info:eu-repo/classification/ddc/530
• Speicherring
• Tevatron
• Datenanalyse
• Physik
• D0 Detector
• New Phenomena
• Extra Gauge Bosons
• Search

Statement dc:rights

• info:eu-repo/semantics/openAccess

Language dc:language

eng

Identifier

https://publications.rwth-aachen.de/search?p=id:%22RWTH-CONV-124090%22

OAI identifier oai:identifier

oai:publications.rwth-aachen.de:62525