Joint Theory Seminar
Speaker: Jon Walsh (Berkeley)
Title: Vetoes in LHC Cross Sections: QCD and Electroweak Effects
Host: Ennio Salvioni
Room: 432
Abstract: Cross sections at the LHC are often measured with cuts to select exclusive numbers of final state jets or leptons. For jets, these cuts often degrade the precision of fixed order perturbation theory, and I will use the case of Higgs production to show how resummation can be used to provide robust predictions and improve the measurement of Higgs couplings. On the leptonic side, at high energies and large momentum exchange electroweak effects can become substantial, and the interplay between experimental cuts, virtual effects, and real radiation is more subtle. I will use Drell-Yan as a backdrop to discuss these issues and show when they can become phenomenologically relevant.
User:
High-Energy Seminars
Description:
Special Seminar
Speaker: Lisa Randall
Title: Self-Interacting Dark Matter
Host:
Room: 432
Abstract:
User:
High-Energy Seminars
Time:
5:30am - 6:30am
Send Reminder:
Yes - 3 days 4 hour 0 minutes before start
Description:
Joint Theory Seminar
Speaker: Brian Shuve (Perimeter)
Title: Not-so-sterile Neutrinos and New Leptonic Interactions
Host: Yuhsin Tsai
Room: 432
Abstract: The Standard Model supplemented with three light sterile neutrinos is a well-motivated, minimal model that accounts for dark matter, baryogenesis, and neutrino masses. However, in such theories the sterile neutrinos turn out to be too sterile: their feeble interactions with the Standard Model generically result in an under-abundance of dark matter and baryons, and the theory is only consistent with cosmological observations with substantial tuning of model parameters. I show how new interactions coupled to Standard Model leptons greatly enhance the baryon and dark matter abundances, eliminating the need for tuning among parameters, and giving generic predictions for probing models of not-so-sterile neutrinos at the LHC and intensity frontier experiments.
Description:
Veterans Day
User:
High-Energy Seminars
Time:
9:00am - 10:00am
Description:
HE Seminar
Speaker:
Title:
Host:
Room: 432
Abstract:
User:
High-Energy Seminars
Time:
7:30am - 8:30am
Description:
User:
High-Energy Seminars
Time:
5:30am - 6:30am
Send Reminder:
Yes - 3 days 4 hour 0 minutes before start
Description:
Joint Theory Seminar
Speaker: Anson Hook (IAS)
Title: Asymmetric Hawking Radiation : Baryogenesis from Hawking Radiation
Host: Yuhsin Tsai
Room: 432
Abstract: We show that in the presence of a chemical potential, black hole evaporation generates baryon number. If the inflaton or Ricci scalar is derivatively coupled to the B-L current, the expansion of the universe acts as a chemical potential and splits the energy levels of particles and their anti-particles. The asymmetric Hawking radiation of primordial black holes can thus be used to generate a B-L asymmetry. If dark matter is produced by the same mechanism, the coincidence between the mass density of visible and dark matter can be naturally explained.
User:
High-Energy Seminars
Time:
9:00am - 10:00am
Description:
HE Seminar
Speaker:
Title:
Host:
Room: 432
Abstract:
User:
High-Energy Seminars
Time:
4:10am - 5:10am
Send Reminder:
Yes - 1 day 4 hour 0 minutes before start
Description:
LHC Lunch
Informal lunch with occasional talks
Host: Ennio Salvioni and Yuhsin Tsai
Speaker: Sunghoon Jung (KIAS)
Title: Perspectives on Future Supersymmetry at Colliders
Room: 432
Abstract: We discuss discovery prospects and new perspectives on Supersymmetry (SUSY) at future hadron colliders. Future SUSY, consisting of lightest gauginos and/or higgsinos and heavier scalars, must be studied in qualitatively different ways in several aspects -- it exhibits generic new features that did not hold previously with lighter O(10-100) GeV sparticles. Discussed topics include (1) gluino searches (gaugino mass ratio and its resummation), (2) electroweakino searches with emphasis on higgsino thermal dark matters (new higgsino relations from Goldstone Equivalence Theorem, and LHC Inverse problem), and (3) gluinos versus stops and electroweakinos.
User:
High-Energy Seminars
Time:
5:30am - 6:30am
Send Reminder:
Yes - 3 days 4 hour 0 minutes before start
Description:
Joint Theory Seminar
Speaker: Gustavo Marques Tavares (BU)
Title: Non-abelian dark matter: Implications for dark matter searches and cosmology
Host: Ennio Salvioni
Room: 432
Abstract: In this talk I examine models in which dark matter is charged under a non-Abelian hidden gauge group. I focus in the case in which the hidden gauge symmetry is unbroken and has confinement scale below the current CMB temperature. In this limit the relevant degrees of freedom are the dark-colored dark matter and the massless dark gluons. I will describe the effects associated with this non-Abelian interactions for dark matter searches and also its effects in the CMB and Large-Scale Structure.
User:
High-Energy Seminars
Time:
8:00am - 9:00am
Send Reminder:
Yes - 0 days 4 hour 0 minutes before start
Description:
HE Seminar
Speaker: Marc Geiller
Title: Recent developments in Loop Quantum Gravity
Host: Steve Carlip
Room: 432
Abstract: