# NPAC (Nuclear/Particle/Astro/Cosmo) Forum

(including photons) is described by an effective field theory (EFT)

that includes only contact interactions. I will describe this EFT,

how it improves upon the standard (non-physical) description, how it

echoes the Danilov treatment, and how its predictions compare to

existing (presently under-constraining) measurements.

*Duke University*

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the entire overhead sky. The large field-of-view combined with<br>

the long observation time makes Milagro the most sensitive<br>

instrument available for surveys and especially for the study<br>

of large, low surface brightness sources. In this talk I will<br>

present recent results from Milagro including the identification<br>

of several new TeV sources associated with Fermi BSL (bright<br>

source list) objects within the Galactic plane. The success of<br>

Milagro has lead to the proposed High Altitude Water Cherenkov<br>

(HAWC) Observatory. HAWC will be built at a high altitude site<br>

(4100m a.s.l.) in central Mexico. The increased elevation, along<br>

with the re-optimization of the design will lead to a 15x<br>

sensitivity improvement compared to Milagro.

*University of Maryland, College Park*

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*University of Milan Bicocca*

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Coupling dark matter (DM) to dark energy (DE) is one of the most promising way to build a unified description of the invisible sector of cosmology. It also glimpses beyond the concordance model LCDM in which DM and DE are assumed physically unrelated. However, such DM-DE couplings make the mass of the DM particles varying, therefore breaking the universality of free fall (Galileo's equivalence principle). Doing so, the strong equivalence principle, stating the universality of gravitational binding energy, does not hold anymore, particularly where DM is profuse like in the large-scale universe. Mass-varying DM therefore induces modifications of gravity. This gravitational feedback on ordinary matter can explain cosmic acceleration, which is then interpreted as the observable signature of the violation of the equivalence principle on cosmological scales. To embrace the various physics of DM-induced violation of the equivalence principle, we have developped a generalisation of Brans-Dicke tensor-scalar theories of gravitation, dubbed the Abnormally Weighting Energy (AWE) Hypothesis. In this approach, the variation of the inertial mass of DM particles induces a running of the gravitational coupling strength on cosmological scales that is observable in the late-time cosmic acceleration. Besides of describing both DM and DE, the AWE hypothesis allows measuring the density paramters of baryons and dark matter from the Hubble diagram *alone*, and its predictions are consistent with the independent cosmological tests of Cosmic Microwave Background (CMB) and Big Bang Nucleosynthesis (BBN). This interpretation also shed new light on the coincidence problem. We will end this seminar by showing how this mechanism could interestingly be applied to the physics of neutrino mass generation and mass-varying neutrinos by turning the spontaneous symmetry breaking of lepton number symmetry into a gravitational symmetry breaking.

*GAMASCO, University of Namur (FUNDP); Louvain U; Paris Observatory;*

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*Ohio State University*

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U(1)'-extended MSSM with/without CP violation.<br>

Unlike the MSSM, the EWPT can be strong first order without a light stop.<br>

In such a case, the singlet-like Higgs bosons and the charged Higgs bosons<br>

play an important role. It is found that at least two Higgs bosons should be<br>

less than 300 GeV for the strong first order phase transition.<br>

Depending on the charged Higgs boson mass, the lightest Higgs boson can be<br>

as large as 220 GeV. It is also found that the CP violating phase in the Higgs sector<br>

do not weaken the strength of the first order EWPT.<br>

*National Central University, Taiwan*

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mature neutrino experiment that has been accumulating data using the NuMI neutrino beam since 2005. Data from 7 x 1020 protons-on-target have been recorded, primarily in low-energy neutrino mode. An update on the charge-current analysis will be presented as well as the recent electron appearance result. Additional results will be briefly reviewed along with prospects for future running in anti-neutrino mode.

*Illinois Institute of Technology*

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Traditionally three-nucleon calculations are carried out by solving Faddeev equations in a partial wave truncated basis, working either in momentum or coordinate space. We solve them directly as function of vector variables. The key advantage of our approach lies in its applicability at higher energies, where special relativity is expected to become relevant. We investigate relativistic three-boson scattering in the framework of Poincare invariant quantum mechanics. The main point here is the construction of unitary irreducible representations of the Poincare group, both for noninteracting and interacting particles. For three-body scattering the Faddeev scheme is reformulated relativistically.

Comparison of scattering observables obtained from relativistic and non-relativistic calculations based on simple Yukawa-type interactions lead to observations that should be relevant for more sophisticated interactions. These comparisons do not involve taking non-relativistic limits. Instead relativistic and non-relativistic three-body calculations are compared that contain interactions fitted to the same two-body data. All of the observed differences result form the different ways in which the two-body dynamics appears in the three-body problem.

*Ohio University, Athens*

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Joint HEP Seminar/NPAC Forum

*Lawrence Berkeley National Laboratory*

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*University of Michigan*

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