STUDY OF RARE B QUARY DECAYS AT LEP/ALEPH
Abstract
A STUDY OF RARE B-MESON DECAYS OF THE TYPE B --> SΓ HAS BEEN PERFORMED IN THE S.M. OF ELECTROWEAK INTERACTIONS, FLAVOR-CHANGING NEUTRAL CURRENTS (FCFC) ARE FORBIDDEN AT THE TREE LEVEL, BUT MAY OCCUR AT THE ONE-LOOP LEVEL THROUGH SO-CALLED PENGUIN DIAGRAMS. USING THE DATA COLLECTED FROM ALEPH/LEP DETECTOR AT CERN A SEARCH FOR THE DECAYS B+- --> K*=-Γ, B0 --> K*0Γ, BS --> 0Γ HAS BEEN MADE. THE FOLLOWING UPPER LIMITS WERE DERIVED: BR(B+- --> K*+-Γ) < 9,5 Χ 10-4, 90% C.L. BR(B0 --> K*0Γ) < 1,4 X 10-4, 90% C.L. IN AGREEMENT WITH THE RESULTS OF CLEO AND ARGUS AND BR(BS --> 0Γ) < 4,1 X 10-4, 90% C.L. THE UPPER LIMIT FORTHE BS --> 0Γ WAS GIVEN FOR THE FIRST TIME. THE REACTION BS --> D-S Π+ WAS ALSO STUDIED AND ONE EVENT WAS FOUND. THIS RESULT COMBINED WITH THE RESULTS FROM OTHER BS HADRONIC DECAYS, LEADED TO THE FOLLOWING FIRST MEASUREMENT OF BS MASS: MBS = [S, 3686 +- 0,0056 (STAT) +- 0,0015 (SYS)] GEV/C2.
Download full text in PDF format (9.07 MB)
(Available only to registered users)
|
All items in National Archive of Phd theses are protected by copyright.
|
Usage statistics
VIEWS
Concern the unique Ph.D. Thesis' views for the period 07/2018 - 07/2023.
Source: Google Analytics.
Source: Google Analytics.
ONLINE READER
Concern the online reader's opening for the period 07/2018 - 07/2023.
Source: Google Analytics.
Source: Google Analytics.
DOWNLOADS
Concern all downloads of this Ph.D. Thesis' digital file.
Source: National Archive of Ph.D. Theses.
Source: National Archive of Ph.D. Theses.
USERS
Concern all registered users of National Archive of Ph.D. Theses who have interacted with this Ph.D. Thesis. Mostly, it concerns downloads.
Source: National Archive of Ph.D. Theses.
Source: National Archive of Ph.D. Theses.