Magic Monday Journal Club

2nd of  March 2015

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It was a very nice Journal Club, where we had the pleasure to welcome the X and IAP team, engaging really fruitful disuccions all the day long. That how I feel should be a successful Journal Club (including a new haircut of Adam of course!!)

A possible indication of momentum-dependent asymmetric dark matter in the Sun

by  A. C. Vincent, P. Scott and A. Serenelli

This paper claims that a certain form of dark matter can fix the discrepancy between the observed  sound wave propagation in the Sun and the predictions of the standard solar model. To this end one needs a few GeV dark matter particle interacting with the ordinary matter via parity-violating momentum^2 dependent force. This is an interesting proposals, though one should remember that dark matter with the required parameters significantly screws up the agreement of the standard solar model with the observed solar neutrino flux.   

Running in the Dark Sector

by   H. Davoudiasl, and W. J. Marciano

I was reading this paper thinking about Mark, our specialist of dark sector. In this paper, the authors had the idea to look at the evolution of the dark coupling  constant as function of the energy of the experiment, depending on the dark sector content. Their result is cleraly illustrated in the figure 1 that shows that indeed, one need to be careful when doing combined analysis of kinetic mixing or dark photons/Z’ models as the running can really play an important role below the EW scale. The rest of the paper is less interesting. You can read an annotated version of the paper there.

Neutral Naturalness from the Orbifold Higgs

by  N. Craig, S. Knapen  and P. Longhi

There has been a resurgence of interest in natural models of electroweak symmetry breaking with uncolored top partners. This paper generalizes the old twin Higgs scenario. They show that twin Higgs is one example  of a larger class of models where a larger gauge and global (flavor) symmetry is "orbifolded" by a discrete subgroup.

Dark Matter and Gauge Coupling Unifcation in Non-supersymmetric SO(10) Grand Unifed Models

by   Y. Mambrini, N. Nagata, K. A. Olive, J. Quevillon and J. Zheng

In this paper, we were concentrated to look at which SO(10)-like models are left once you put a serie of minimal condition on the nature of the dark matter: stable, not interacting with the SM gauge group, no degenerate state, respecting unfication of the gauge couplings, and respecting the lifetime of the proton. Very strangely, from all the possibility of intermediate gauge groups, only 2 survive [SU(4)XSU(2)_R X SU(2)_R and SU(4)XSU(2)_R X SU(2)_R X D]. We made the analysis at 2 loop levels, which change a lot the 1 loop one. Quite a technical work, but the Figure 4 and the table above will give you a feeling of our result. You can read an annotated version of the paper here.

Some conclusive considerations on the comparison of the ICARUS νμ→νe oscillation search with the MiniBooNE low-energy event excess

by  ICARUS Collaboration

The Icarus neutrino experiment revised their earlier results concerning a comparison of their null results  with the LSND and Miniboone oscillation signal. These signals are still in tension with Icarus data, but now they are  disfavored only at 90% confidence level.  

Pseudoscalar Portal Dark Matter

by    A. Berlin, S. Gori,  T. Lin,  and L.-T. Wang

Unfortunately, the title is a false publicity. It is not a pseudoscalar-portal dark matter, but let say, the SUSY model without the squarks and the Higgsinos. 3 neutral states. Being free from the gauge SUSY constraint, you can decouple the pseudoscalar A and then render it quite light to be able to explain the GC excess («Hooperon») while in the meantime respecting LUX constraint (due to the velocity suppression). Nothing really new there. This paper will interest people who are interested in this kind of paper. You can read an annotated version of the paper there.

Planck, LHC, and α-attractors

by  R. Kallosh and A. Linde

The inflationary models of "alpha attractors" have gained some attention recently because they are in good agreement with the latest constraints from Planck. However, this paper does not suggest there's anything deep about this class of model; instead, it seems to be just an example of supergravity with an ad-hoc choice of the Kahler potential  and superpotential.   uncertainties of such a work, I do not know what to think about a «5 sigma» significance in this condition.

New physics with ultra-high-energy neutrinos

by     D. Marfatia, D. W. McKay, and T. J. Weiler

Mmmmmmm.. What can I say about this paper??? First, I read the title, the abstract and the conclusion, I thought «great work that should have been done». Then I read the paper and thought «Much ado about nothing». Then thinking a little bit more (it happens to me sometimes-but rarely) I thought, that is not so bad in fact.  The authors compiled all the different possibility of measurement, from Icecube to ANITA passing through EUSO, from upgoing to downgoing neutrino, to summarize all the possible effect that can be observed depending on the BSM value of the neutrino-nucleon interaction. Their table 1 is a good summary of their results. You can read an annotated version of the paper here.