pedro.schwaller  •  Oct 26, 2015

Gravitational Wave paper published (PRL Editors Suggestion!)

http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.115.181101 Read more
pedro.schwaller  •  Feb 20, 2015

Emerging Jets

We propose a novel search strategy for new physics at the LHC that utilizes calorimeter jets that (i) are composed dominantly of displaced tracks and (ii) have many different vertices within the jet cone. Such emerging jet signatures are smoking guns for models with a composite dark sector where a parton shower in the dark sector is followed by displaced decays of dark pions back to SM jets. No current LHC searches are sensitive to this type of phenomenology. We perform a detailed simulation for a benchmark signal with two regular and two emerging jets, and present and implement strategies to suppress QCD backgrounds by up to six orders of magnitude. At the 14 TeV LHC, this signature can be probed with mediator masses as large as 1.5 TeV for a range of dark pion lifetimes, and the reach is increased further at the high-luminosity LHC. The emerging jet search is also sensitive to a broad class of long-lived phenomena, and we show this for a supersymmetric model with R-parity violation. Possibilities for discovery at LHCb are also discussed. Paper link.




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pedro.schwaller  •  Jan 08, 2015

Compressed Electroweakinos at the LHC

Are monojet searches for dark matter sensitive to electroweakinos? It turns out that while it is difficult, the answer is YES, and a number of things can be improved beyond the simple monojet searches to further increase the sensitivity. The paper has been out for a while, we are now looking into the possibilities at a future 100 TeV collider.  

The figure shows the sensitivity for directly produced Neutralinos and Charginos at the 14 TeV LHC. For more details and more plots you can find the paper here
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pedro.schwaller  •  Jun 27, 2013

The Scale of Dark QCD

We introduce a QCD-like dark sector with dark baryons as dark matter candidates. Using infrared fixed points we relate the dark matter mass to the proton mass scale. Together with a mechanism that generates equal amounts of dark baryon and ordinary baryon asymmetries, we find a natural explanation for the similarity of the dark matter and baryonic matter energy densities in the universe.  
The essential dynamics of our model is illustrated in the figure. For more details, check out the full paper Yang Bai and I wrote.  
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pedro.schwaller  •  Nov 13, 2012

Higgs phenomenology and dark matter with vector-like leptons

We study an extension of the standard model with a vector-like generation of leptons. This model provides a viable dark matter candidate and a possibility to enhance the Higgs decay rate into a pair of photons.


















The plot on the left illustrates this for a region of parameter space where the dark matter relic density is controlled through the co-annihilation mechanism. The full paper, written together with Aniket and Carlos, is available here.
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pedro.schwaller  •  Oct 26, 2011

The dark side of the Higgs boson

My most recent work with the Argonne group, about invisible Higgs decays, dark matter and a proposal for a measurement at the LHC. The full thing is available on the arxiv, here is one of our nice plots:



This nicely illustrates the complementarity of direct dark matter searches (red shading) and Higgs searches (blue shading) at the LHC. 
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