pp and ππ intensity interferometry in collisions of Ar+KCl at 1.76A GeV

Abstract

Abstract. Results on pp, π+ π + , and π − π − intensity interferometry are reported for collisions of Ar+KCl at 1.76A GeV beam energy, studied with the High Acceptance Di-Electron Spectrometer (HADES) at SIS18/GSI. The experimental correlation functions as a function of the relative momentum are compared to model calculations allowing the determination of the space-time extent of the corresponding emission sources. The ππ source radii are found significantly larger than the pp emission radius. The present radii do well complement the beam-energy dependences of Gaussian source radii of the collision system of size A + A 40 + 40. The pp source radius at fixed beam energy is found to increase linearly with the cube root of the number of participants. From this trend, a lower limit of the pp correlation radius is deduced.

Strangeness production in low energy heavy ion collisions via Hagedorn resonances

“…At initial time t = 0, the nuclei are initialized with a necessary distance away from each other and then propagating onto each other. Centrality/impact parameter constraints are implemented according the experimental needs [19,38,42]. When not stated otherwise, usual collisions are replaced by the formation of Hagedorn states in this work.…”

A femtoscopic correlation analysis tool using the Schrödinger equation (CATS)

“…Femtoscopy has been mainly employed so far to study the properties of the particle emitting source in heavy-ion collisions by analyzing particle pairs with low relative momentum undergoing a known interaction [1,2]. In heavy-ion collisions pion femtoscopy has been the most common tool to get insight into the time-space evolution of the produced medium [3][4][5][6][7][8][9][10][11][12][13]. a e-mail: dimitar.mihaylov@mytum.de b e-mail: valentina.mantovani-sarti@tum.de Unlike heavy-ion collisions, nucleon-nucleon (NN) collisions are not affected by the formation of a medium such as the Quark-Gluon-Plasma.…”

“…This afterburner only delivers the asymptotic solution at large relative distances which eventually leads to a wrong correlation function at small distances. For heavy-ion collisions the source radius is typically between 2 and 6 fm [3][4][5][6][7]. However in pp collisions at LHC energies the extracted source can be even smaller than 1.5 fm [14,15,20], and the EPOS transport model predicts a non-Gaussian source which peaks at distances of around 1 fm (see Fig.…”

Second-order correlations in single-particle interferometry

“…This understanding has not only set the fundament for modern quantum optics [41], but also helped to prove the quantum nature of fermions [42] and bosons [43]. Today, noise correlation analysis is widely used in modern astrophysics [44], quantum atom optics [45] and particle physics [46]. For matter-waves, temporal correlations have been used to analyze the counting statistics of atom lasers [47] and to demonstrate the coherent transfer of magnetic field fluctuations onto an atom laser [48].…”

“…Therefore, the spatial periodicity in the amplitude spectrum is directly given by the periodicity of the unperturbed interference pattern. The amplitude of the modulation in udirection is now solely given by the peak phase deviations j j , via the square of the Bessel functions.The amplitude spectrum corresponding to the second-order correlation function of the two frequency perturbation shown in figure 3(a) is calculated according to equation(46) and plotted infigure 5(a)for positive frequency components. The amplitude spectrum of the approximate solution of equation(47)is plotted infigure 5(b).…”