Interplay between flavor symmetries and cosmology

Date

Lecturer

Title and Abstract

Files

26. 11. 2008

Gregor Bregar

Eksperimenti DAMA in CDMS

20. 11. 2008

Jure Zupan

2-komponentna temna snov in rezultati Pamele

13. 11. 2008

Mitja Rosina

Pogovor o WIMP-ih

6. 11. 2008

Kerim Suruliz (ICTP)

Top physics at ATLAS
With millions of top quark pairs produced per year at nominal luminosity, the LHC will be a true 'top factory'. In this talk I will review the prospects for top quark physics at the ATLAS experiment, focussing on the measurement of the top pair production cross-section.

30. 10. 2008

Nejc Kosnik

Leptoquarks in D meson decays

23. 10. 2008

Bojan Golli, Mitja Rosina, Simon Sirca

Problemi iz delavnice na Bledu septembra 2008

16. 10. 2008

Borut Bajc

Majhna uganka pri umeritvenem posredniku zlomitve

9. 10. 2008

Sasa Prelovsek

Iskanje tetrakvarkov v kromodinamiki na mreziV dolgi zgodovini opazovanja hadronov preseneca predvsem (skoraj) popolna odsotnost eksoticnih stanj, kot so na primer hibridni hadroni, tetrakvarki, pentakvarki itd. Ene redkih izjem so nedavno opazene carobne resonance ter lahki skalarni mezoni. Opazen spekter slednjih nakazuje, da so to tetrakvarki in ne konvencionalna kvark-antikvark stanja. V seminarju bom predstavila svoje iskanje tetrakvarkov v kromodinamiki na mrezi.

11. 9. 2008

Ilja Dorsner

Minimal SO(10) splits supersymmetry

4. 9. 2008

Veljko Dmitrasinovic (Vinca, Beograd)

Chiral multiplet mixing as an explanation of the nucleon's axial coupling
Almost 40 years ago Weinberg, Phys. Rev. 177, 2604 (1969), suggested mixing of chiral multiplets $(\frac12,0) \oplus (0,\frac12)$ and $(1,\frac12) \oplus (\frac12,1)$ as an explanation of the nucleon's isovector axial coupling constant $g_A^{(1)}$ = 1.23, its value at the time; or its present value 1.267$\pm$0.004. The nature of the mixing mechanism was not specified by Weinberg, however. The nucleon has an isoscalar axial coupling $g_A^{(0)}$ as well, however, which can be estimated from spin-polarized lepton-nucleon DIS data as $g_A^{(0)}=$ 0.28 $\pm$ 0.16. The question is if the same chiral mixing angle can explain the low value of this coupling? The answer depends on the $U_A(1)$ chiral transformation properties of the admixed fields. Three-quark nucleon interpolating fields in QCD have well-defined, if perhaps unexpected $U_A(1)$ chiral transformation properties that can be used to (naively) predict the isoscalar axial coupling $g_A^{(0)}$. There are two such (Ioffe) nucleon fields, which together with their chiral mirrors offer a large number of possibilities. In this talk we shall explore several such scenarios.

15. 7. 2008

Altug Ozipneci (Middle East Technical University, Ankara)

Magnetic Moments and Pion Couplings of Xi_Q Baryons in Light Cone QCD Sum Rules

10. 7. 2008

Vikram Soni (National Physics Laboratory, New Delhi, India)

Darwin, diversity and stability in an evolutionary network

12. 6. 2008

Tsedenbaljir Enkhbat (ICTP)

Radiative fermion masses in the MSSM and lepton flavor violation
I will talk about my current work wherein the lighter generations of fermions obtain their masses through finite radiative corrections from SUSY breaking parameters. This mechanism, to be succesful, could lead to quite distinct slepton mass spectrum and have associated FCNC phenomena such as \mu->e\gamma etc.

12. 5. 2008

Veljko Dmitrasinovic (Vinca, Belgrade)

Low-lying states in the Y-string three-quark potential
We study the masses of various three-quark SU(6) multiplets in the N=0,1,2 shells, confined by the Y-string three-quark potential. The exact Y-string potential consists of one, so-called three-string term, and three angle-dependent two-string terms. Due to the technical complexity of the exact Y-string potential we treat the problem at four levels of increasingly accurate approximation: 1) the area-dependent part of the three-string potential in the first order perturbation approximation; 2) the (approximate) three-string potential expanded up to the first power in hyper-spherical angles; 3) the (approximate) three-string potential to all orders in power expansion in hyper-spherical harmonics, without taking into account the transition(s) to two-string potentials; 4) the exact minimal-length string potential to all orders in power expansion in hyper-spherical harmonics, while taking into account the transition(s) to two-string potentials.

8. 5. 2008

Francesco Caravaglios (Universita` di Milano)

Neutrinos, Grand Unified Theories and The Hierarchy Problem
The hierarchy problem in grand unified theory suggests two possible extensions of ordinary quantum field theory. One extension is achieved adding non linear terms to the Schroedinger functional equation that describes ordinary quantum field theory. This extension violates the linear superimposition principle of quantum mechanics. We will make a comment on the safety of collider physics in the context of this theory. A more predictive and conservative extension of quantum field theory is achieved through third quantization. In this extension, the origin of fermion families is understood. We will discuss some interesting predictions in flavour physics and neutrino phenomenology.

24. 4. 2008

Stefan Antusch (MPI, Munich)

Leptogenesis and the Flavour Structure of the Seesaw

17. 4. 2008

Umit Oktay Yilmaz (Physics Department, Mersin University, Turkey)

Model Independent Analysis of Rare B_c → D_s l⁺ l^- Decay Beyond the Standard Model
The rare B_c → D_s l⁺ l^- decay is investigated by using the most general model independent effective Hamiltonian. The general expressions of longitudinal, normal and transversal polarization asymmetries for l^- and l⁺ and the combined asymmetries of them are found. The dependencies of the branching ratios and polarizations on the new Wilson coefficients are presented. The analysis shows that the branching ratios and the lepton polarization asymmetries are very sensitive to the scalar and tensor type interactions. These results will be very useful in searching new physics beyond the standard model.

15. 4. 2008

Damir Bećirević (LPT Universite Paris-Sud, Orsay)

Lifetimes of Beauty Hadrons : QCD corrections
I discuss the current status of the theoretical control over the lifetime ratios of beauty mesons. I will explain how the OPE works in this case, review the perturbative QCD corrections and the non-perturbative ones. In particular I will show in what way the recent work with S.Fajfer and J.F.Kamenik [arXiv:0804.1750] is helpful in controlling the non-perturbative QCD effects.

7. 4. 2008

Jernej Fesel Kamenik

Constraining minimal flavor violation

3. 4. 2008

Yasaman Farzan

Leptonic Unitarity Triangle and CP-violation
Similarly to the CKM matrix in the quark sector, the mixing matrix in the lepton sector can contain a CP-violating phae that can show up in the neutrino oscillation. Measuring this CP-violating phase is one of the main challenges of the neutrino physics. Inspired by the unitarity triangle method in the quark sector, we introduce reconstrucing the unitarity triangle in the lepton sector as an alternative method to extract the CP- violating phase of the neutrino mixing matrix.

6. 3. 2008

Jan O. Eeg (Physics Department, Univ. of Oslo)

Short and long distance strong interaction effects in B → D π decays.<

20. 3. 2008

Matej Pavšič

Izjemno preprosta teorija vsega (Članek Garretta Lisija o poenotenju na osnovi E8)

6. 3. 2008

Jan O. Eeg (Physics Department, Univ. of Oslo)

Short and long distance strong interaction effects in B → D π decays.

28. 2. 2008

Miha Nemevšek

Lepton flavour violation in a SU(5) inspired model.

21. 2. 2008

Saša Prelovšek

Uspehi in težave pri simulacijah lahkih skalarnih mezonov na mreži
Narava lahkih skalarnih mezonov še danes ni povsem znana. Povzela bom rezultate različnih simulacij skalarnih mezonov na mreži. Poudarila bom tudi težave zaradi katerih simulacije še danes niso dale dokončnega odgovora za mase skalarnih mezonov.

14. 2. 2008

Emile Grgin (Independent researcher, New York)

An approach to the structural unification of quantum mechanics and relativity

4. 2. 2008

Alejandro Ibarra (DESY)

Gravitino Dark Matter: Signatures From Colliders and Gamma Ray Observatories
Scenarios with gravitino dark matter face potential cosmological problems induced by the presence of the Next-to-Lightest Supersymmetric Particle (NLSP) at the time of Big Bang Nucleosynthesis (BBN). A very simple solution to avoid all these problems consists on assuming that R-parity is slightly violated, since in this case the NLSP decays well before the onset of BBN. Remarkably, even if the gravitino is no longer stable in this scenario, it still constitutes a very promising dark matter candidate. In this talk we review the motivations for this scenario and we present a model that naturally generates R-parity breaking parameters of the right size to produce a consistent thermal history of the Universe, while satisfying at the same time all the laboratory and cosmological bounds on R-parity breaking. We also discuss possible signatures of this scenario at gamma ray observatories and at colliders.

1. 2. 2008

P. Q. Hung

Mirror fermions, electroweak scale right-handed neutrinos and experimental implications
The particle content of the Standard Model is extended to include mirror fermions resulting in a model in which right-handed neutrinos obtain electroweak scale masses. It has a number of experimental implications such as a direct production of right-handed neutrinos at colliders with like-sign dileptons being characteristic signatures, Lepton Flavour Violating processes mediated by mirror fermions such as mu -> e gamma, tau -> mu gamma, etc.

24. 1. 2008

Borut Bajc

Spontana zlomitev globalne supersimetrije brez umeritvenih singletov

17. 1. 2008

Mitja Rosina

Nekaj vtisov s konference "2nd Workshop on Flavour Dynamics, Albufeira, Portugal, November 3-10, 2007"