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HK: Fachverband Physik der Hadronen und Kerne

HK 71: Hadron Structure and Spectroscopy X

HK 71.3: Talk

Thursday, March 14, 2024, 16:15–16:30, HBR 62: EG 19

Common femtoscopic hadron-emission source in pp collisions at the LHC — •Maximilian Korwieser for the ALICE Germany collaboration — Technische Universität München

The ALICE Collaboration recently published a plethora of results on the interaction between many exotic combinations of particles, most notably p−Ω, obtained from femtoscopic measurements in pp collisions at the LHC. Previous studies of the source in pp collisions at √s = 13 TeV have been performed by analysing p−p and p−Λ correlations. The source was constructed using a Gaussian core for the primordial particles and introducing exponential deformations due to the decay of short-lived strongly decaying resonances. The conclusion was that the primordial sources for hadrons share a common m_T scaling. The goal of this work is to ascertain whether the primordial sources for mesons also exhibit the same m_T scaling, for example in the case of same charge π–π (or K⁺–p), for which by far the largest contribution from resonances is expected. A differential study of the spatial extension of the source function as a function of transverse mass (m_T) and multiplicity is presented. The results are based on minimum-bias and high-multiplicity pp collisions at √s = 13 TeV recorded with the ALICE detector. An mT scaling behaviour of the source is observed and found to be compatible with previous results in the baryonic sector. This measurement gives confidence for a common source for hadrons in small systems, allowing to employ the same model to constrain the source for meson−baryon and meson−meson pairs. This research was funded by BmBf Verbundforschung (05P21WOCA1 ALICE).

Keywords: Femtoscopy; Hadron emission; ALICE; LHC; Correlation study