Garchinger Maier-Leibnitz-Kolloquium: Accessing strong interactions in three-hadron systems at the LHC

by Dr Bhawani Singh ((Physik Department, TUM))

Lecture Hall, ground floor (west) (LMU building, Am Coulombwall 1, campus Garching)

Lecture Hall, ground floor (west)

LMU building, Am Coulombwall 1, campus Garching


Systems with three hadrons, like unbound ensembles of a deuteron and a hadron, serve as a fundamental reference to constrain nuclear interactions. We present for K^+ –d, p–d as well as triplets of hadrons femtoscopic correlations measured by the ALICE Collaboration in proton–proton (pp) collisions at sqrt{s} = 13 TeV at the LHC. It is demonstrated that correlations in momentum space between deuterons and kaons or protons allow to study three-hadron dynamics at distances of 1 fm and less. The K^+ –d correlation analysis shows that the relative distances at which deuterons and protons/kaons are produced are around 2 fm. The p–d  correlation shows that a comprehensive three-body calculation, accounting for the deuteron's internal structure and short-range nuclear interaction, is crucial in order to explain the observed correlations. The measurements of p–p–p and p–p–Lambda correlations provide insights into the underlying two- and three-body interactions. The three-body effects have been explored using the cumulant method by subtracting pairwise interaction contributions in the measured correlation functions.

Hybrid access via ZOOM:
Meeting ID: 984 5733 2925
Passcode: 979953

Organized by

Peter Thirolf (LMU) / Norbert Kaiser (TUM)