4 research outputs found
Software for physics of tau lepton decay in LHC experiments
Software development in high energy physics experiments offers unique
experience with rapidly changing environment and variety of different standards
and frameworks that software must be adapted to. As such, regular methods of
software development are hard to use as they do not take into account how
greatly some of these changes influence the whole structure. The following
thesis summarizes development of TAUOLA C++ Interface introducing tau decays to
new event record standard. Documentation of the program is already published.
That is why it is not recalled here again. We focus on the development cycle
and methodology used in the project, starting from the definition of the
expectations through planning and designing the abstract model and concluding
with the implementation. In the last part of the paper we present installation
of the software within different experiments surrounding Large Hadron Collider
and the problems that emerged during this process.Comment: Thesis submitted to Applied Computer Science Department in partial
fulfillment of the requirements for the MSc degree. This work is partially
supported by EU Marie Curie Research Training Network grant under the
contract No. MRTN-CT-2006-0355505, Polish Government grant N202 06434
(2008-2011) and EU-RTN Programme: Contract No. MRTN-CT-2006-035482
'Flavianet
Ascertaining the spin for new resonances decaying into tau+ tau- at Hadron Colliders
Evidence of a new particle with mass ~125 GeV decaying into a pair of tau
leptons at the Large Hadron Collider spurs interest in ascertaining its spin in
this channel. Here we present a comparative study between spin-0 and spin-2
nature of this new particle, using spin correlations and decay product
directions. The TauSpinner algorithm is used to re-weight distributions from
qqbar -> gamma/Z -> tau+ tau- sample to simulate a spin-2 state exchange. The
method is based on supplementing the Standard Model matrix elements with those
arising from presence of a new interaction. Studies with simulated samples
demonstrate the discrimination power between these spin hypotheses based on
data collected at the Large Hadron Collider.Comment: 17 pages, 16 encapsulated postscript figure
The HepMC3 Event Record Library for Monte Carlo Event Generators
In high-energy physics, Monte Carlo event generators (MCEGs) are used to simulate the interactions of high energy particles. MCEG event records store the information on the simulated particles and their relationships, and thus reflects the simulated evolution of physics phenomena in each collision event. We present the HepMC3 library, a next-generation framework for MCEG event record encoding and manipulation, which builds on the functionality of its widely-used predecessors to enable more sophisticated algorithms for event-record analysis. By comparison to previous versions, the event record structure has been simplified, while adding the possibility to encode arbitrary information. The I/O functionality has been extended to support common input and output formats of various HEP MCEGs, including formats used in Fortran MCEGs, the formats established by the HepMC2 library, and binary formats such as ROOT; custom input or output handlers may also be used. HepMC3 is already supported by popular modern MCEGs and can replace the older HepMC versions in many others.In high-energy physics, Monte Carlo event generators (MCEGs) are used to simulate the interactions of high energy particles. MCEG event records store the information on the simulated particles and their relationships, and thus reflect the simulated evolution of physics phenomena in each collision event
The HepMC3 event record library for Monte Carlo event generators
In high-energy physics, Monte Carlo event generators (MCEGs) are used to simulate the interactions of high energy particles. MCEG event records store the information on the simulated particles and their relationships, and thus reflect the simulated evolution of physics phenomena in each collision event. We present the HepMC3 library, a next-generation framework for MCEG event record encoding and manipulation, which builds on the functionality of its widely-used predecessors to enable more sophisticated algorithms for event-record analysis. As compared to previous versions, the event record structure has been simplified, while adding the possibility to encode arbitrary information. The I/O functionality has been extended to support common input and output formats of various HEP MCEGs, including formats used in Fortran MCEGs, the formats established by the HepMC2 library, and binary formats such as ROOT; custom input or output handlers may also be used. HepMC3 is already supported by popular modern MCEGs and can replace the older HepMC versions in many others