Initial analysis towards a measurement of the branching fractions B [right arrow] [rho][gamma] and B [right arrow] [omega][gamma]

The Standard Model of particle physics predicts the existence of the "Unitary Triangle," which graphically relates the matrix elements of the Cabbibo Kobayashi Maskawa matrix and describes the strength of transformations from one quark to another. By measuring the ratio [Beta](B [right arrow] [rho]/[omega][gamma]) / [Beta](B [right arrow] K*[gamma]) we can measure a side length of this triangle and use the result to test the Standard Model, and perhaps illuminate new physics. In this thesis, a new set of cuts on variables measured by the BABAR detector is optimized to obtain high levels of efficiency and significance in separating the rare [rho][gamma] or [omega][gamma] signal events from the high levels of continuum background. Neural nets that can consider correlations between variables have also been implemented to suppress the continuum. Preliminary results using Monte Carlo are discussed. Final values using runs 1 through 5 of the BaBar experimental data will be published in summer 2006.

Department dc:contributor.department

Massachusetts Institute of Technology. Dept. of Physics.

Grantor dc:publisher

Massachusetts Institute of Technology

Year dc:date.issued

2006

Author dc:creator

• Bright, Molly (Molly Gallogly)

Advisor dc:contributor.advisor

• Gabriella Sciolla.

• Physics.

Statement dc:rights

• M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission.

Licence dc:rights.uri

• http://dspace.mit.edu/handle/1721.1/7582

Language dc:language.iso

eng

Handle dc:identifier.uri

http://hdl.handle.net/1721.1/36133

OAI identifier oai:identifier

oai:dspace.mit.edu:1721.1/36133