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List of previous students

Nicola OrlandoFaten Hariri

Emma Kuwertz

Spyridon Argyropoulo

Sabrina Sacerdoti

Simone Amoroso

Jesper Roy Christiansen

Nathan Hartland

Christian Roehr

Benjamin Watt

Philip Ilten

Nishita Desai

Sercan Sen

Miroslav Myska

Sudha Ahuja

Holger Schulz

Avi Gershan

Aleksander Kusina

Magdalena Slawinska

Flavia Dias

Kenneth Wraight

Irais Bautista Guzman

Sparsh Navin

Paolo Francavilla

Riccardo Di Sipio

Seyi Latunde-Dada

Devdatta Majumder

Martijn Gosselink

Christopher Bignamini

Marek Schönherr

Michal Deak

Noam Hod

Florian Bechtel

Jonathan Ferland

Manuel Bähr

Alexander Flossdorf

Piergiulio Lenzi

Gluon Splitting to Heavy Quarks in Parton Shower Algorithms

Michal Deak is a PhD student from DESY, Hamburg, on a four-month MCnet studentship at CERN.

With the appearence of heavy quarks in the hard scattering process a new scale - the mass of the heavy quark, appears. Logarithms of the ratio of the hard scale and heavy quark mass might contribute to the cross section. These logarithms, being large, have to be resummed. In the context of a Monte Carlo generator this can be achieved by taking the mass effects into account in the parton shower algorithm.At present in the Monte Carlo Herwig++ the mass of the heavy quark is taken into account only in the final state parton showers. My project is investigate the role of mass effects in the initial state parton showers in the HERWIG and Herwig++ Monte Carlo programs and try to implement some of them into Herwig++. The project includes mainly learning to use Monte Carlo generators Herwig and Herwig++ and calculation of splitting functions for processes with massive particles involved in the splitting process for initial state parton splittings.

If one looks on b jets (jets containing a b quark) associated with Z boson production (Drell-Yan process via inihilation of b bbar pair) one observes (figure: transverse momentum of the b-jet on the y-axis and pseudo-rapidity on the x-axis) that the region of low transversal momenta is not filled and that jets are accumulated in a small transverse momentum region close to some threshold. Inclusion of mass effects should remove this unphysical effect.