HIP NEWS October 6th 2014
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DEPARTMENT OF PHYSICS / HIP JOINT COLLOQUIA / SEMINARS
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Tuesday 7 October 2014 at 10.15 in A315
Sourov Roy (Indian Association for the Cultivation of Science, Kolkata)
Phenomenology of U(1)_R -lepton number model
Abstract: In this talk I shall discuss light neutrino masses and mixing, phenomenology of a keV sterile neutrino dark matter and the Higgs boson signal rate in the di-photon channel at the LHC, in the framework of U(1)_R-lepton number model augmented by a right handed neutrino superfield. The lepton number of the standard model fermions are identified with the negative of their R-charges. As a result, a subset of leptonic R-parity violating operators can be present and are consistent with the U(1)_R symmetry. One of the sneutrinos might acquire a substantial vacuum expectation value leading to interesting phenomenological consequences. This model not only provides a small tree level mass to one of the active neutrinos but also renders a suitable warm dark matter candidate in the form of a sterile neutrino with negligible active-sterile mixing. This can explain the recent observation of an X-ray line signal at around 3.5 keV. In order to fit the experimental results involving light neutrino masses and mixing
angles we introduce a small breaking of U(1)_R symmetry. The lightest Higgs boson mass receives an additional tree level contribution proportional to the square of the neutrino Yukawa coupling f. This allows for a 125 GeV Higgs boson at the tree level for an order one f and still having a small tree level mass for the active neutrino.
Thursday 9 October 2014 at 10.15 in A315
Lauri Wendland (Helsinki)
New results on charged Higgs boson searches
Abstract: A scalar boson at mH = 125 GeV has been discovered, but is it the only one? The existence of further scalar bosons would represent unambiguous evidence for physics beyond the SM. In this seminar, the new preliminary CMS results on charged Higgs boson searches are discussed and compared with ATLAS results. Model-independent limits will be shown and an interpretation of them is given in the MSSM benchmark scenarios.
COSMO-Seminar
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Wednesday 8 Oct 2014 at 14:15 in A315
Alexey Golovnev (Saint Petersburg State University)
Some thoughts on information paradox in Black Hole physics
I will briefly review the paradigm of Black Hole complementarity. Then I will discuss the recent AMPS paradox which amounts to putative incompatibility of equivalence principle and monogamy of entanglement. Finally, after presenting several proposed ways to surmount the contradiction, I will argue that tiny quantum gravitational corrections at local scales might prove to be an important ingredient to the physics of evaporating Black Holes.
Campus info sessions
on the new occupational health care agreement in November
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Sign up through Henkka.
www.helsinki.fi/trainingcalendar
Networking – Strategic Theme of the Year:
Networking competencies
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Sign up through Henkka.
www.helsinki.fi/trainingcalendar
Fortcoming training for new international employees
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More info on Henkka:
www.helsinki.fi/trainingcalendar
Visitors
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A. Golovnev 17.9. – 10.10. (MK)
L. Laperashvili 23.9. – 14.10. (AT)
J. Rantaharju 6.10. – 10.10. (KR)
S. Roy 1.10. – 31.10. (KH)
D. Weir 6.10. – 10.10. (KR)
