Jul 4 – 11, 2012
Melbourne Convention and Exhibition Centre
Australia/Melbourne timezone
ICHEP2012 - 36th International Conference for High Energy Physics

A charged Z' to explain the apparent disagreement in top-antitop asymmetires between Tevatron and LHC

Jul 6, 2012, 2:45 PM
Room 216 (Melbourne Convention and Exhibition Centre)

Room 216

Melbourne Convention and Exhibition Centre

Melbourne Australia


Ms Estefania Coluccio Leskow (Buenos Aires University (AR))


We propose a phenomenological model with a flavour changing electrically-neutral but not self-conjugated Z' to simultaneously explain the large Tevatron ttbar forward-backward asymmetry and the compatible with zero LHC charge asymmetry. We find that the model produces a natural cancellation in pp collisions which is suppressed in Tevatron's ppbar collisions, leading to a large forward-backward asymmetry. Being not self-conjugated, the model is not affected by same-sign top pair production. We find the region in parameter space compatible with the mentioned observables in addition to the measured cross-sections. We propose easy distinctive features of the model which can be tested in differential charge asymmetry measurements.

Financial Support Justification for Early-Stage Researchers

I'm a first year PhD student at Buenos Aires University (UBA) under the supervision of Ezequiel Álvarez and Daniel de Florian. My research group has already paid for the airfare, but the conference fee still presents a serious financial challenge for me to participate. I'm a young researcher from Argentina, and do not have access to the economic resources to attend this kind of conference. Participating in such an important event as ICHEP2012 would be very relevant for my career as I could have the opportunity to meet colleagues from all over the world working in my field, something that is difficult to accomplish living in this country, not only due to our economic situation as a developing country but also because of our geographical distance from much of the centres of scientific research. Working on phenomenology requires constant contact with experimental results and conferences such as these are crucial in developing relationships with scientists actively involved in my area of research. Furthermore, since I'm in the first year of my PhD, giving a presentation could be a very enriching opportunity to showcase my work and exchange knowledge with the scientific community engaged in this field.

Primary authors

Ms Estefania Coluccio Leskow (Buenos Aires University (AR)) Dr Ezequiel Álvarez (Buenos Aires University (UBA))

Presentation materials