Dr. Ph.D. Valentina Mantovani Sarti
Offered Bachelor’s or Master’s Theses Topics
- Measurement of the ΛΦ interaction with femtoscopy studies in pp collisions at ALICE
- In low-energy hadronic physics the modeling of the strong interactions among baryons (particles composed of three quarks) is obtained through effective lagrangians in which the mediator of the strong forces are typically mesons (particles composed of two quarks). The interaction amongst strange baryons (so-called hyperons), as Lambdas (Λ), is currently not well constrained experimentally since these particles are unstable and performing scattering experiments is extremely challenging. Hyperon-hyperon interactions though are one of the key ingredients in the physics of Neutron Stars (NS) in order to understand if these strange particles can be one of the ingredients present in the core of these dense astrophysical objects. At the moment, theoretical predictions based on meson-exchange models consider the Φ meson as the mediator of the strong interaction between two Λs, producing a repulsive interaction. However, the coupling between a Λ and Φ is still not measured, hence theoretical predictions currently rely on symmetry relations to establish the strength. Recently in the ALICE experiment we used a technique called femtoscopy, which measures the correlation in the momentum space between two particles, has been used to infer on the strong interaction of the particle pair. At LHC a lot of hyperons and mesons, including Λs and Φs, are produced in the collision of protons at center of mass energy of 13 TeV. The project will include the identification of Lambdas and Phi particles in the RUN2 data measured by the ALICE detector in pp collisions through experimental techiques and the following construction of the main observable: the correlation function. The study of the obtained ΛΦ correlation function will allow to determine the nature and strength of the interaction and the comparison with the current theoretical understanding will allow to shed light on the hyperon-hyperon interaction role inside NS.
- suitable as
- Bachelor’s Thesis Physics
- Supervisor: Laura Fabbietti