Speaker
Pavel Krokovny
(Budker Institute of Nuclear Physics (RU))
Description
The existence of large matter-antimatter asymmetry ($CP$ violation) in
the $b$-quark system as predicted in the Kobayashi-Maskawa theory was
established by the $B$-Factory experiments. However,
this cannot explain the magnitude of the matter-antimatter asymmetry
of the universe we live in today. This indicates undiscovered new
physics exists. The Belle II experiment, the next generation of the
$B$-Factory, is expected to reveal the new physics by accumulating 50
times more data (~50ab$^{-1}$) than Belle by 2022. The Belle II computing
system has to handle an amount of beam data eventually corresponding
to several tens of PetaByte par year under an operation of the
SuperKEKB accelerator with a designed instantaneous luminosity. Under
this situation, it cannot be expected that one site, KEK, will be able
to provide all computing resources for the whole Belle II
collaboration including the resources not only for the raw data
processing but also for the MC production and physics analysis done by
users. In order to solve this problem, Belle II employed the
distributed computing system based on DIRAC, which provides us the
interoperability of heterogeneous computing systems such as grids with
different middleware, clouds and the local computing clusters. Since
the last year, we performed the MC mass production campaign to confirm
the feasibility and find out the possible bottleneck of our computing
system. In parallel, we also started the data transfer challenge
through the transpacific and transatlantic networks. This presentation
describes the highlights of the Belle II computing and the current
status. We will also present the experience of the latest MC
production campaign in 2014.
Primary author
Pavel Krokovny
(Budker Institute of Nuclear Physics (RU))
Co-author
Takanori Hara
(on behalf of the Belle II computing group)