Münster 2017 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 20: Heavy Ion Collisions and QCD Phases IV

HK 20.8: Talk

Tuesday, March 28, 2017, 16:00–16:15, F 1

Baryon-baryon femtoscopy in pp collisions at 7 TeV with ALICE at the LHC — •Oliver Arnold for the ALICE collaboration — Physik Department, Technische Universität München, Garching, Germany — Excellence Cluster "Universe", Garching, Germany

Two-particle correlation functions at low relative momenta are sensitive to the size of the emission zone of the particles. By knowing the interaction of the emitted particle pair very precisely it is possible to make a detailed study of the source size of the system, which has an extension on the fermi scale. This is usually done with particle pairs, where the interaction is precisely known. However, if the size of the emission zone is constrained one can use the femtoscopy technique to investigate the interaction between pairs of particles where not much is known about the interaction.

We use the femtoscopy technique to measure the correlation functions of proton-proton, proton-Lambda and Lambda-Lambda pairs, which were produced in pp collisions at 7 TeV at the Large Hadron Collider and measured with the ALICE experiment. This is the first femtoscopy measurement with baryon pairs at such a large energy and small system. We show that a simultaneous fit of the proton-proton and proton-Lambda correlation functions is sensitive to scattering parameters of the proton-Lambda pair. This opens the possibility to investigate the interaction of proton-Lambda pairs complementary to scattering experiments. This work is supported by HIC for FAIR, HGS-HIRe and BMBF FSB 202.