Search for the production of the Standard Model Z boson in association with W+/- boson in proton anti-proton collisions at 1.96 TeV center of mass energy.

Format:

Book

Thesis/Dissertation

Author/Creator:

Keung, Justin.

Contributor:

University of Pennsylvania.

Language:

English

Subjects (All):

Particles (Nuclear physics).

0798.

Local Subjects:

0798.

Physical Description:

163 pages

Contained In:

Dissertation Abstracts International 71-12B.

System Details:

Mode of access: World Wide Web.

text file

Summary:

The search for the production of the Standard Model Z boson in association with a W boson is motivated and discussed. This is performed using 4.3 fb-1 of Tevatron Run II data collected with the CDF detector in s = 1.96 TeV proton anti-proton collisions. This is a signature-based analysis where the W boson decays semileptonically into a high-PT electron or muon plus a neutrino, and where the Z boson decays into two b quark jets (b-jets). We increase the signal-to-background ratio by identifying the b-quarks in the jets with a new neural network-based algorithm. Another neural network then uses kinematic information to distinguish WZ to further increase the signal-to-background ratio. Since our sensitivity is still not enough to achieve an observation, we set a 95% Confidence Level upper limit on the product of the WZ production cross section and its branching fraction to the decay products specified above, and express it as a ratio to the theoretical Standard Model prediction. The resulting limit is 3.9xSM (3.9xSM expected).

Notes:

Source: Dissertation Abstracts International, Volume: 71-12, Section: B, page: 7487.

Adviser: Evelyn Thomson.

Thesis (Ph.D.)--University of Pennsylvania, 2010.

Local Notes:

School code: 0175.

ISBN:

9781124325187

Access Restriction:

Restricted for use by site license.