20-22 May 2015
C.U.
Mexico/General timezone
Contribution Oral contribution
C.U.
-
Unidad de Seminarios Ignacio Chávez
Measurment of the Lambda_b polarization in the Lambda_b -> Lambda J/psi decay
Speakers
- Mr. Rogelio REYES ALMANZA
Primary authors
- Mr. Rogelio REYES ALMANZA (CINVESTAV)
Co-authors
- Ivan HEREDIA DE LA CRUZ (CINVESTAV-IPN)
- Dr. Heriberto CASTILLA VALDEZ (Cinvestav)
Files
Abstract
Predictions based on heavy-quark effective theory indicate for Lambda_b baryons a large fraction of the transverse b-quark polarization to be retained after hadronization. We performed an angular analysis in the Lambda_b-> Lambda(p+pi-) J/psi(mu+mu-) decay. We present a measurement of the Lambda_b polarization using data from pp collisions at √s = 7 TeV and 8 TeV collected with the CMS detector.