Saturnalia 2020

ZOOM, check details (CAPA Online)

ZOOM, check details

CAPA Online

Javier Redondo, Siannah Peñaranda

Conference series dedicated to catch up with the recent Theoretical and Experimental developments in the broad range of fields covered by our newborn center CAPA,  as well as with the adventures and misfortunes of our dear young expats.

This year it was held ONLINE via ZOOM.

Javier Redondo, Siannah Peñaranda
  • Monday, December 21
    • Monday session: E. Arganda, K. Altenmueller, J. Asorey, M. Giannotti
      Convener: Javier Redondo (CAPA, DPTUZ)
      • 1
        Scalar Taus and Where to Find Them

        After almost 10 years of performance at different center-of-mass energies the LHC has collected a large amount of data with the scientific milestone of the discovery of the Higgs boson. One of the most exciting questions we can ask ourselves is whether the Higgs sector in Nature consists of more states than the one discovered. There are many searches that look for signatures of extended Higgs sectors at the LHC, however those searches focus on the fact that these new states decay mostly into standard model (SM) particles. Different beyond SM theories, such as supersymmetry (SUSY), involve new particles in their spectra that couple to the Higgs bosons and therefore must be taken into account when considering searches of additional Higgs states. That is the case of the scalar taus (staus) present in the minimal supersymmetric standard model (MSSM). These particles are the scalar partners of the tau leptons and in some MSSM scenarios the heavy neutral Higgs bosons may decay into them with a relatively large branching ratio. In this talk I will try to show how these searches of staus could lead to a soon discovery of both these SUSY particles and the heavy neutral Higgs bosons.

        Speaker: Ernesto Arganda (IFT, Madrid )
      • 12:30 PM
      • 2
        The search for keV-scale sterile neutrinos with TRISTAN

        Sterile neutrinos are theoretically well motivated particles that do not participate in any fundamental interaction except for the gravitation. With the help of these particles one could elegantly explain the origin of the neutrino mass, dark matter and the matter-antimatter asymmetry in the universe. As sterile neutrinos can mix with the known active neutrinos, they could be discovered in laboratory searches.
        The TRISTAN project is an extension of the KATRIN experiment to search for the signature of keV-scale sterile neutrinos in the tritium beta decay spectrum. KATRIN, which is currently taking data to study the effective neutrino mass, consists of a strong tritium source, an electromagnetic filter and a counting detector. The filter only allows electrons with energies close to the endpoint, i.e. a tiny fraction of all electrons emerged from the tritium, to pass to the detector. As the signature of a sterile neutrino could appear anywhere in the spectrum, this filter will be turned off for TRISTAN. To handle the resulting counting rates of up to 109 1/s, the current detector will be replaced by a novel 4000-pixel silicon drift detector system that features an outstanding energy resolution of a few hundred eV. Prototype detectors were successfully tested and first tritium data was taken at the Troitsk ν-mass spectrometer to study systematics and develop analysis methods. The full-scale detector will be installed at KATRIN as soon as the neutrino mass program is finished in a few years.

        Speaker: Konrad Altenmueller (CAPA)
      • 1:15 PM
      • 3
        Beyond optical Cosmology: The high redshift Universe

        We are currently living a blooming era of wide field optical cosmological surveys, either spectroscopic such as Dark Energy Spectroscopic Instrument (DESI) or photometric such as the ongoing Dark Energy Survey (DES), the future Large Synoptic Survey Telescope (LSST) or future imaging component survey of EUCLID. By analyzing the distribution of matter clustering, we can use the growth of structure, in combination with measurements of the expansion of the Universe, to understand dark energy or to test different models of gravity. However, we also live in the multi-tracer and multi-messenger astrophysics era. In particular, during the next decades, radio surveys will map the matter distribution at high redshifts, especially covering the current redshift desert between early and late expansion, crucial to discriminate between current cosmological theoretical models. Like with optical data, there are radio imaging surveys such as radio continuum surveys such as the ongoing Evolutionary Map of the Universe (EMU), a program of the Australian Square Kilometre Array (ASKAP), or spectroscopic by measuring the hydrogen 21cm line, such as Wallaby. However, we can also use intensity mapping as a low resolution spectroscopic technique in which we use the intensity given by the emission from neutral hydrogen from patches of the sky, at different redshifts, with surveys such as Tianlai or CHIME. By cross-correlating these maps with galaxy catalogues we can improve our constraints on cosmological parameters and to understand better how neutral hydrogen populates different types of galaxies and haloes. Creating realistic mock intensity mapping catalogues is necessary to optimize the future analysis of data. In the last part of my talk, I will introduce the simulated neutral hydrogen full sky catalogues that we have created, using the Horizon run 4 simulations. In particular, I will show the prospects of measuring the growth rate of structures with only intensity mapping information around redshift z=1 and the prospects of cross-correlating the intensity mapping information with optical galaxy catalogues, such as DESI.

        Speaker: Jacobo Asorey (CIEMAT)
      • 2:00 PM
        Gossiping Break
      • 4
        Axions in astrophysics. New constraints from a Hard X-ray Observation of Betelgeuse

        In the first part of the talk, I will briefly review the astrophysics of axion like particles (ALPs) and present some recent results. Then, I will discuss with more details a recent bound on the ALP-photon coupling from a dedicated observation of Betelgeuse by the NuSTAR satellite telescope.

        Speaker: Maurizio Giannotti (Barry University)
  • Tuesday, December 22
    • Tuesday Session: J.A. García Pascual, Y. Martinez, B. Schwabe
      Convener: Javier Redondo (CAPA, DPTUZ)
      • 5
        A High-Granularity Timing Detector (HGTD) for the ATLAS upgrade

        ATLAS (A Toroidal LHC AparatuS) is one of the largest particle detector experiments constructed at the LHC (Large Hadron Collider) located at CERN (European Organization of Nuclear Research). It takes advantage of the available collision energy of the LHC, up to 13 TeV. Beyond outstanding performance of LHC, an upgrade of the machine has been foreseen, the so-called High Luminosity LHC (HL-LHC), with an increased luminosity, about a factor of five larger than nominal values. Therefore, the ATLAS detector will be upgraded to be able to cope with the HL-LHC environment, so-called Phase II upgrade. In this context, the installation of a novel High Granularity Timing Detector (HGTD) has been proposed. HGTD will provide timing resolution with a precision of 30-50 ps per track. This precise timing can be achieved with the novel Low Gain Avalanche Detectors (LGAD) technology. The timing information will be used to resolve tracks at the very dense track environment of the HL-LHC and can set the baseline for future detectors in High Energy Physics experiments.

        Speaker: Juan Antonio García Pascual (CERN)
      • 12:30 PM
      • 6
        Fuzzy Dark Matter on Galactic Scales

        The distinctive effects of fuzzy dark matter (FDM) are most visible at non-linear galactic scales. In order to discriminate FDM from other kinds of dark matter it is therefore of particular interest to quantify FDM halo dynamics. The focus here will be on radial density profiles, cold dark matter velocity dispersion verses FDM interference patterns, and solitonic core dynamics. Employing a variety of different algorithms, three different scenarios are investigated, namely pure FDM, FDM+baryons, and FDM+cold dark matter.

        Speaker: Bodo Schwabe (CAPA, UNIZAR)
      • 1:15 PM
        Gossiping Break
      • 7
        La teoría de Chern-Simons-Wong y su relación con invariantes de nudo

        (versión en ingles al final) Se estudia la teoría clásica no-Abeliana de Chern-Simons acoplada con partículas que portan carga cromoeléctrica conocidas como partículas de Wong y su relación con invariantes de nudo. Cada uno de los invariantes obtenidos pueden ser escritos en un lenguaje puramente geométrico que permite posteriormente describir las propiedades de anudamiento de algunos link’s conocidos. Se muestra que el invariante obtenido al orden dos del desarrollo perturbativo de la acción on-shell de la teoría, puede describir perfectamente las propiedades de anudamiento de un Link de cuatro componentes así como anudamiento del Link de Whitehead, el cual es un link de dos componentes.

        The classical non-Abelian theory of Chern-Simons coupled with particles that they carry chromoelectric charge known as Wong particles and their relationship with knot invariants. Each of the invariants obtained can be written in a purely geometric language that allows later to describe the properties knotting of some known links. It is shown that the invariant obtained at order two of the perturbative development of the on-shell action of the theory, can perfectly describe the knotting properties of four-component Link as well as the knotting of the Whitehead Link, which is a two- component link.

        Speaker: Yisely Martinez (CAPA, UNIZAR)