Research

We write below in general terms the different kind of research developed at our department, together with the staff that carries on such research.



EXPERIMENTAL HIGH ENERGY PHYSICS

DØ Experiment

The DØ Experiment consists of a worldwide collaboration of scientists conducting research on the fundamental nature of matter. The experiment is located at the the Tevatron Collider, at the Fermi National Accelerator Laboratory (Fermilab) in Batavia, Illinois, USA. The research is focused on precise studies of interactions of protons and antiprotons at the highest available energies. It involves an intense search for subatomic clues that reveal the character of the building blocks of the universe. The Mexican collaboration works at DØ b-Physics group, performing studies in all issues related to the b-quark at the Fermilab Tevatron Collider. Some topics include CP-violation, the CKM matrix, B-hadron decays and b-production.

Heriberto Castilla Valdez
Alberto Sánchez Hernández
Eduard de la Cruz Burelo
Iván Heredia de la Cruz



CMS Experiment

The Large Hadron Collider (LHC) smashes groups of protons together at close to the speed of light: 40 million times per second and with seven times the energy of the most powerful accelerators built up to now. Many of these will just be glancing blows but some will be head on collisions and will be very energetic. When this happens some of the energy of the collision is turned into mass and previously unobserved, short-lived particles – which could give clues about how Nature behaves at a fundamental level - fly out and into the detector. CMS is a particle detector that is designed to see a wide range of particles and phenomena produced in high-energy collisions at the LHC. Like a cylindrical onion, different layers of detectors measure the different particles, and use this key data to build up a picture of events at the heart of the collision. Scientists then use these data to search for new phenomena that will help to answer questions such as: What is the Universe really made of and what forces act within it? And what gives everything substance? CMS will also measure the properties of previously discovered particles with unprecedented precision, and be on the lookout for completely new, unpredicted phenomena.

Heriberto Castilla Valdez
Alberto Sánchez Hernández
Eduard de la Cruz Burelo
Ricardo López Fernández
Iván Heredia de la Cruz


Belle-II Experiment

The Belle-II experiment is a super B-factory experiment colliding electrons and positrons at different energies with a luminosity 50 times larger than achieved at Belle. The studies focus on flavor physics and CP violation measurements that could be carried out in the LHC era aiming at an improved precision.



Eduard de la Cruz Burelo
Iván Heredia de la Cruz
Gabriel López Castro
Pablo Roig





ALICE (A Large Ion Collider Experiment)



DESY (Deutsches Elektronen Synchrotron)





THEORY & PHENOMENOLOGY

Cosmic rays

Cosmic rays are energetic subatomic particles (protons, neutrons, leptons, etc.) originating from the outer space that enter into the Earth's atmosphere producing a collision with its molecules, mainly of oxygen and nitrogen. The result is a laboratory for studying interactions of fundamental particles at energy scales that can be well above the energies reached in man made colliders. Members of our group are involved in the Pierre Auger the and HAWC collaborations.

A. Zepeda



Electroweak Physics and non-pertubative QCD

Today the Standard Model of particle physics (SM) is acknowledged to be an incredible good description of particle physics processes below the electroweak (EW) scale (around 100 GeV). In the pursue of reaffirmation as such, the particle physics group thrives to compute radiative corrections in order to propose all sorts of precision tests. And in the search of sources of physics that cannot be described by the SM, and as a way of parameterizing physics above the EW scale, Effective Lagrangians are applied to processes that may be subject to measurement in the near feature in available or planned experimental facilities. The control of hadronic uncertainties turns out to be crucial when confronting theoretical prediction with measurements in the intensity frontier.

G. López-Castro
P. Roig


Model Building beyond the Standard Model

The question: how to make an ultraviolet completion of the SM? has been the obsession of particle physics community in its quest for a unified theory of the known four fundamental forces. A theory that connects physics at the Electroweak Scale (EW) with that at the Planck scale, i.e. gravity, it is the goal of particle physics of this century. Given the huge energy difference among them, 32 orders of magnitude in the GeV scale, Hierarchy Problem , the task is a formidable human endeavour.


Supersymmetry emerged in the seventies from a symmetry of String Theory but it was soon realized that was a great way to cancel the quadratic divergences that corrections to the Higgs boson mass could have in a trivial extension of the SM up to the Planck scale. This solves the hierarchy problem. Today, in the era of the LHC, armies of phenomenologists analyze the properties that the supersymmetric particles should have for them to be observed at the LHC.

A. Pérez-Lorenzana


Extra Dimensions, without implying a String Theory, emerged in the 1999 revolution that posed the idea that we could live on a brane along a warped space separated by a bulk connecting to the brane on which gravity is present. A warped factor between the two branes is thought to avoid the hierarchy problem.

A. Pérez-Lorenzana


Flavour Physics is an area encompassing physics present both in the SM and beyond. All has to do in essence with understanding the mixing in the SM and its extensions, the structure of fermion masses, including neutrinos, and the way flavour violating processes could be understood.

G. López-Castro
O. Miranda
A. Pérez-Lorenzana

Neutrino physics. Although formally an extension of the SM, the research involved is truly quite unique because the confirmation of oscillating neutrinos by the SuperKamiokande experiment in 1998. Experimental information means that we have lots of data to play around and construct models of masses and mixing. Additionally processes that involve solar neutrinos it is a fascinating world on its own.

G. López-Castro
O. Miranda
A. Pérez-Lorenzana


Cosmology. Inflation, Dark Energy and Dark Matter, Early Universe....

A. Pérez-Lorenzana


String Theory is a beautiful mathematical description of physics in ten dimensions, describing in that limit all the four known interactions. When compactified to four dimensions, it becomes a candidate to describe our present world. Attempts for reaching a final working model of such is far from being obtained, however String Theory on its own is a fascinating area that has made its own contributions both to branches of mathematics such as number theory and of course to the way we look for the ultimate fundamental theory in particle physics. At our department, there are several formal aspects of it being studied.

H. Compean compean@fis.cinvestav.mx





MEDICAL PHYSICS

It has been produced digital images for mammography and angiography through a detection system consisting in Silicon Strip Detectors (SSD) mainly used in High Energy Experiments. The SSD were modified to detect X-rays with a good spatial and time resolution. Studying the possibilities of improving these resolutions can open the chances to apply these detectors to help on the prevention of breast cancer. Using breast biopsies in which it was presumed to have micro calcifications there has been obtained some results. Istruments have been designed and constructed: among them, there is an electronic system which detects fluorescent light coming from ADN samples treated with aptamers in order to detect a signal of contamination of those samples with the HPV (Human Papiloma Virus). Also a ionization chamber was constructed to measure absorb and equivalent doses when irradiating the biological samples studied for breast cancer purposes. Moreover, there is also the planning of constructing and applying High Energy instruments for instance an accelerator together with a PAD Chamber detector to obtain digital images. Finally, techniques in image processing on breast and hippo campus digital images are used to give the physicians a tool to improve the diagnosis for breast cancer and Alzheimer diseases, respectively.

Luis Manuel Montaño Zetina


Department of Physics CINVESTAV-IPN Av. IPN 2508 Colonia San Pedro Zacatenco Mexico City 07360