A study of the CKM angle gamma using the LHCb experiment and a distributed workload management system
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Authors
Li, Ying Ying
Advisors
Gibson, Val
Date
2009-11-17Awarding Institution
University of Cambridge
Author Affiliation
Department of Physics
Qualification
Doctor of Philosophy (PhD)
Language
English
Type
Thesis
Metadata
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Li, Y. Y. (2009). A study of the CKM angle gamma using the LHCb experiment and a distributed workload management system (Doctoral thesis). https://doi.org/10.17863/CAM.16562
Description
Pagination different to approved hard bound copy, PhD.32674, but content the same.
Abstract
The LHCb experiment, at the Large Hadron Collider (LHC), will make
precision CP violation measurements and search for new physics beyond
the Standard Model of particle physics. The 14 TeV proton-proton collisions
at the LHC will produce the full range of B-hadrons, at a data rate
of peta-bytes per year. In order to process this unprecedented amount
of data, distributed computing resources (the Grid) located across four
continents are coordinated by a series of workload management systems
(Grid middlewares). DIRAC, the LHCb distributed workload management
system for event simulation, reconstruction and user analysis is
extended from the Linux operating platform to the Windows platform,
allowing a transparent integration of Windows resources to the existing
Linux system.
The B+/- -> D0/D-0 (K0
S pi+ pi-)K+/- decay, a key channel for the precision
measurement of the CKM angle gamma,
is studied using the multiplatform
DIRAC system. The expected annual yield from this channel
for 2 fb-1 of data (a full data taking year) is ~4200 events, with a total
physics background to signal ratio (B/S) of < 0:54 at the 90% confidence level.
The dominant background is expected to arise from a real D0/D-0 candidate
reconstructed with a fake kaon from the underlying event, with a B/S = 0.35 +/- 0.03
where the error is statistical. The potential
background arising from a real D0/D-0 candidate reconstructed
with a mis-identifi ed pion is greatly reduced,with a B/S < 0:095 at the 90%
confi dence level, by the use of particle identi cation information
from the RICH sub-detector. The estimated LHCb statistical sensitivity
to gamma is ~12o for 2 fb-1 of data,
using a model dependent Dalitz
analysis with a model error of ~9°.
Identifiers
This record's DOI: https://doi.org/10.17863/CAM.16562