End-of-master projects 2017/18

This link points to detailed information abouot the MSc grants offered to students of official masters related to the activities of our Unit, in which they intend to execute their end-of-master project.

Find below the list of End-of-Master projects offered by the CFP Unit, along with a short description and a list of contact persons.

Analysis of neutrino oscillations with the Double Chooz experiment

Dr. Carmen Palomares Espiga (CIEMAT)
Double Chooz is a neutrino oscillation experiment that measures the disappearance of antineutrinos produced at the Chooz nuclear power plant, in France, using two detectors placed at different distances from the nuclear reactors. In November 2011 Double Chooz carried out the first measurement of the mixing angle θ13 , previously unknown, with a single detector and is currently taking data with both detectors, which will allow to drastically improve the precision of this measurements in the coming years. In this End-of-Master project we propose to analyse the data collected by this experiment and to study the oscillations of neutrinos from the nuclear plant. This study will require performing an event selection capable of identifying the signal produced by neutrinos in the detector from background events.

Light collection studies in the WA105 liquid argon neutrino prototype detector at CERN

Dr. Clara Cuesta (CIEMAT)Dr. Inés Gil Botella (CIEMAT)

Future neutrino experiments like DUNE in Fermilab (USA), whose main goal is to measure the CP symmetry violation in the leptonic sector, will consist of liquid Argon TPC detectors exposed to neutrino beams. In this context, WA105 is a 300 ton prototype being built at CERN that will be exposed to charged particles beams (resulting from the neutrino interactions). As a previous step, a 3x1x1 m3 detector is taking data at the moment. The neutrino group at CIEMAT is responsible for the scintillation light collection system of that detector, which comprises a set of large photomultipliers operating at cryogenic temperatures. The tasks proposed in this End-of-Master project include the data analysis of the light signal of the 3x1x1 m3 detector, and the simulation of the processes that will take place in the detector studying their scintillation signal.

Dark Matter searches with the underground argon experiments ArDM and DarkSide-20k

Dr. Roberto Santorelli (CIEMAT), Dr. Luciano Romero Barajas (CIEMAT), Dr. Pablo García Abia (CIEMAT)
The nature of the Dark Matter is widely recognized as one of the most important questions still open in modern physics. Multiple observations suggest that only less than 16% of the matter component of the universe is made out of ordinary matter, while the largest contribution is given by non-baryonic and non-luminous matter which manifests its presence through gravitational effects. A possible explanation for the Dark Matter problem lies in the existence of weakly interacting massive particles called WIMPs, relic from the Big Bang. There are several worldwide efforts on-going, typically carried out in underground laboratories, searching for the tiny signals produced by the WIMP interactions. The aim of the ArMD experiment, installed in the Canfranc Laboratory under the Pyrenees mountains, is to detect WIMPs with an electroluminescent time projection chamber filled with a ton of liquid argon. The goal of the master thesis is to contribute to the analysis of the data currently being taken by the experiment, verifying the performances of the liquid argon detector and the rejection power of the background events, ultimately contributing to the search of the dark matter signal.

Development of new double phase argon detectors for Dark Matter direct searches

Dr. Roberto Santorelli (CIEMAT), Dr. Luciano Romero Barajas (CIEMAT), Dr. Pablo García Abia (CIEMAT)
The direct search of weakly interacting massive particles (WIMPs) is one of the most challenging topics for the future underground experiments. The discovery of those particles could explain the nature of the Dark Matter which is one of the fundamental problems still unanswered in modern physics. If the WIMPs exist, they may produce nuclear recoils via weak interactions in an energy range from few up to 100 keV. The detection limits, set by the experiments currently taking data, puts very stringent requirements for the new generation of detectors in terms of background rejection and sensitivity. Experiments based on noble elements, like argon or xenon electroluminescent time projection chambers, offer the best prospects for detectors with low energy threshold, large mass and excellent background discrimination capabilities necessary for this research. The proposed work is focused on the construction of a high pressure argon/xenon prototype for future Dark Matter and rare event searches. The activity includes both hardware developments, with the design of the electronics and data acquisition systems, as well as the analysis of data taken in the laboratory.

 

Search for new gauge bosons in proton-proton collisions at √s=13 TeV using data from the CMS experiment at the CERN LHC

Dr. Begoña de la Cruz Martínez (CIEMAT)
Proton proton collision data taken with the CMS detector at the CERN LHC collider, at a centre of mass energy of 13 TeV, provide an optimal scenario to search for new particles and/or interactions, beyond those already known in the Standard Model. This model describes with great precision particles and their interactions in a plethora of phenomena, though nowadays it is conceived as an effective theory of a more general one, valid at higher energies. The existence of new gauge bosons will be studied in this TFM, using data taken during 2016.

Upgrade studies of online event selection in proton proton collisions at the CMS experiment for the future High-Luminosity LHC (HL-LHC) collider at CERN

Dr. Cristina Fernández Bedoya (CIEMAT)

For the coming years, CERN foresees an upgrade of the LHC (Large Hadron Collider) that will allow an increase of a factor 10 its current luminosity (10 times more collisions in the same period). This new configuration is known as HL-LHC (High Luminosity LHC). It will allow higher precision measurements and observation of rare processes, with very low production cross sections, not accesible at the current LHC. The online selection of interesting collisions to be kept for further study nowadays is already a challenge, with collisions rates of the order of MHz. These rates will increase in the HL-LHC, thus becoming crucial the development of fast, efficient and smarter online selection algorithms.

Study of cosmic ray propagation models with AMS

Dr. Carlos Mañá Barrera (CIEMAT), Dr. Jorge Casaus Armentano (CIEMAT)
After more than 5 years of operation on the International Space Station, the magnetic spectrometer AMS-02 has performed measurements of the cosmic ray electrons, positrons, protons, antiprotons and helium fluxes up to TeV energies. The deviations observed in all these species with respect to the accepted production and propagation models may indicate the presence of new mechanisms or new physics related to the nature of dark matter in the galaxy. New measurements of AMS-02 in other channels, like the ratio boron over carbon, or the light isotopes ratios, will provide a set of data large enough to significantly reduce the uncertainties associated to the cosmic ray production and propagation models. The goal of this project is to evaluate the impact expected from the new AMS-02 measurements.

Study of a calorimeter for the direct detection of cosmic rays with energies up to 1 PeV

Dr. Javier Berdugo Pérez (CIEMAT), Dr. Jorge Casaus Armentano (CIEMAT)
The direct measurement of the energy spectrum of the most abundant species in cosmic rays (protons, helium, electrons) displays structures incompatible with a pure power-law distribution. These observations point to the existence of production and propagation mechanisms not foreseen in the current models and may indicate the presence of new physics. In order to discriminate among the various possibilities, it is necessary to extend the energy range of the precision measurements performed in space platforms beyond the TeV. Given the low rate expected at these energies, it will be necessary to have instruments with a large effective area. Calocube is a calorimeter proposed to perform precision measurements of cosmic rays of energies up to the PeV. The goal of this projects is to evaluate the requirements necessary to carry out such measurements and to validate the proposed design by analysing the data collected with a prototype of the calorimeter in the test particle beam at CERN.

The role of dust in chemical evolution models

Dr. Mercedes Mollá Lorente (CIEMAT)

The light emited by the stars is absorbed by the grains of the dust and then re- emitted in the infrared. These dust grains are produced by supernova explosions and AGBs stars, ie in stellar death processes. From the works of Valiante & Schneider (2007) and Zhukovska (2008) we will try to obtain tables of dust production for different stellar masses and metallicities that can later be included in a chemical evolution model to calculate the dust census that can be in a galaxy or region.

Stydy of stellar populations of galaxies at z=0.4-0.5

Dr. Mercedes Mollá Lorente (CIEMAT), Dr. Lluis Galbany (Univ. Pitssburg), Dr. Manuel E. Moreno-Raya (CAHA)

The purpose of the work is obtaining the history of star formation and the evolution of the metallicity of six galaxies observed with GTC from the study of their spectra by applying STARLIGHT code (Cid-Fernandes et al., 2005) and extracting information about their stellar populations.

 

Search for ZZ / ZW diboson resonances in the semileptonic X → ZV → l+l- qqbar final state at √s = 13 TeV with CMS

Dr. Jorge Fernández De Trocóniz (UAM)Dr. José M. Hernández (CIEMAT)

The search for new physics beyond the Standard Model (BSM) is possibly the most important goal of CMS at Run 2. With the huge number of LHC collisions, a number of experimental channels are available for the first time with high statistics. One example is the production of vector boson pairs (Z and W) with very large invariant masses. These channels are particularly sensitive to the existence of BSM physics signals as (among others) new heavy partners of the Higgs boson, heavy versions of the electroweak bosons, or Kaluza-Klein particle excitations in models with Randall- Sundrum warped extra dimensions. The work proposed here consist in analyzing the first CMS data at √s = 13 TeV, searching for heavy ZZ and ZW resonances in the semileptonic decay channel X to ZV to l+l- qqbar The data will be compared to the prediction of a background model based on SM processes, and the level of agreement data – background model will allow us to reach conclusions about either the presence, or the exclusion of BSM signals in the data. The statistical significance of the observation will be carefully evaluated.