HIP NEWS September 8th 2014
Upcoming events in Finland: CERN´s 60th anniversary
See the link http://www.hip.fifi/?page_id=1963
DEPARTMENT OF PHYSICS / HIP JOINT COLLOQUIA / SEMINARS
Tuesday 9 September 2014 at 10.15 in A315
Bhupal Dev (Univ. of Manchester)
Naturally Aligned Two Higgs Doublet Model and its Collider Signatures
Abstract: We show that the lightest Higgs sector resulting from a Maximally Symmetric Two Higgs Doublet Model (MS-2HDM) based on the SO(5)-symmetry becomes naturally aligned with that of the Standard Model (SM), independently of the charged Higgs boson mass and \tan\beta. Nevertheless, renormalization group effects due to the hypercharge gauge coupling and third-generation Yukawa couplings may break sizably this SM alignment, along with the custodial symmetry inherited by the SO(5) group. Using the current Higgs signal strength data from the LHC, which disfavor large deviations from the SM alignment limit, we derive lower mass bounds on the heavy Higgs sector as a function of \tan\beta, which can be stronger than the existing limits for a wide range of parameters. Finally, we propose new collider signals involving third-generation quarks to directly probe the heavy Higgs sector of the MS-2HDM during the run-II phase of the LHC.
Wednesday 10 Sep 2014 at 14:15 in A315
Chris Haines (DAS, University of Chile)
Understanding the SF-density relation in a Lambda-CDM universe where massive clusters are still being assembled
The evolution and star-formation activity of galaxies depends
strongly on their environment, the strongest impacts being seen in massive clusters. To understand the processes transforming cluster galaxies, we use cosmological simulations which follow the growth and assembly of massive clusters, and the orbits of galaxies as they are accreted into clusters and transformed. We compare these simulations to results from the Local Cluster Substructure Survey (LoCuSS) of 30 massive clusters at z~0.2, combining Spitzer 24um imaging and extensive spectroscopy of cluster members, to provide strong constraints for the efficiency and time-scales required to quench star-formation in recently accreted cluster galaxies. We see that clusters are still being assembled, by finding numerous infalling X-ray groups, providing sites for galaxies to be pre-processed prior to their arrival into the clusters themselves, as required to explain the shortfall of star-forming galaxies at large cluster-centric radii.
Finnish for foreigners: registration for autumn 2014 courses has begun
F. Hehl 18.8. – 12.9. (AT)