Abstract
In the collisions of heavy ions the nuclear matter can undergo a phase transition from hadrons to a state of deconfined quarks and gluons called the Quak-Gluon Plasma. Femtoscopic measurements of two-particle correlations at small relative momenta reveal information about the space-time characteristics of the system at the moment of particle emission. The correlations result from quantum statistics, final-state Coulomb interactions, and the strong final-state interactions between the emitted particles.It has been predicted that correlations due to the strong final-state interactions in a system where a narrow resonance is present will be sensitive, in the region of the resonance, to the source size and momentum-space correlations. Such a measurement can provide complementary information to the measurements at very low relative momenta. This paper presents the preliminary results of a STAR analysis of unlike-sign kaon femtoscopic correlations in Au+Au collisions at √ s NN = 200 GeV, including the region of ϕ (1020) resonance. The experimental results are compared to a theoretical prediction that includes the treatment of resonance formation due to the final-state interactions.
Highlights
In 1960 Goldhaber and collaborators observed in proton-antiproton annihilations an excess of pairs of identical pions produced at small relative momenta [1]
Since the femtoscopic measurements of two-particle correlations at low relative momenta became a standard tool for extracting the space-time extents of particle emitting sources
It is predicted that the correlation function will be more sensitive in the region of the resonance, where the strength of the correlation should change with the source size, ae-mail: jlidrych@gmail.com r as ∼ r−3 in comparison with measurements at the very low relative momenta, where the correlation function depends on r−2 or r−1
Summary
In 1960 Goldhaber and collaborators observed in proton-antiproton annihilations an excess of pairs of identical pions produced at small relative momenta [1]. These observed correlations, as experimenters correctly asserted, came as a result of quantum statistics. Since the femtoscopic measurements of two-particle correlations at low relative momenta became a standard tool for extracting the space-time extents of particle emitting sources. R as ∼ r−3 in comparison with measurements at the very low relative momenta, where the correlation function depends on r−2 or r−1. Pairs of unlike-sign kaons are ideally suited for such femtoscopic analysis as they contain the narrow φ(1020) resonance. From previous STAR source imaging analysis [4], the kaon source function is known to be well-described by a Gaussian form
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