Finite-size effect on two-particle production in continuous and discrete spectrum

Lednický, R.

doi:10.1134/s1063779609030034

Cited by 89 publications

(102 citation statements)

References 45 publications

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“…The femtoscopic correlations due to the Coulomb FSI between the emitted electron and the residual nucleus in beta decay have been well known for more than 80 years; they reveal themselves in a sensitivity of the Fermi function (an analogue of the CF 31 ) to the nuclear radius. Compared with non-interacting particles, the FSI effect in a two-particle system with total spin S manifests itself in the substitution of the product of plane waves, exp(−ip 1 X a − ip 2 X b ), by the non-symmetrized Bethe- 14,19,32,33 . For identical particles, the symmetrization requirement in the representation of total pair spin S takes on the same form for both bosons and fermions: the non-symmetrized amplitude should be substituted by [Ψ…”

Section: Methodsmentioning

confidence: 99%

“…At small relative momenta, k * < ∼1/r * , this solution can be used in practical calculations with the condition |t * | mr * 2 19, 32 . The equal-time approximation is almost exact in beta decay, and it is usually quite accurate for particles produced in high-energy collisions (to a few percent in the FSI contribution to CF's of particles even as light as pions 32 ). In collisions involving heavy nuclei, the characteristic separation of the emission points, r * , can be considered substantially larger than the range of the strong-interaction potential.…”

Section: S(+)mentioning

confidence: 99%

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Measurement of interaction between antiprotons

Adamczyk

Adkins

Agakishiev

et al. 2015

Nature

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One of the primary goals of nuclear physics is to understand the force between nucleons, which is a necessary step for understanding the structure of nuclei and how nuclei interact with each other. Rutherford discovered the atomic nucleus in 1911, and the large body of knowledge about the nuclear force since acquired was derived from studies made on nucleons or nuclei. Although antinuclei up to antihelium-4 have been discovered 1 and their masses measured, we have no direct knowledge of the nuclear force between antinucleons. Here, we study antiproton pair correlations among data taken by the STAR experiment 2 at the Relativistic Heavy Ion Collider (RHIC) 3 and show that the force between two antiprotons is attractive. In addition, we report two key parameters that characterize the corresponding strong interaction: namely, the scattering length (f 0 ) and effective range (d 0 ). As direct information on the interaction between two antiprotons, one of the simplest systems of antinucleons, our result provides a fundamental ingredient for understanding the structure of more complex antinuclei and their properties.Although the theory of Quantum Chromodynamics (QCD) provides us with an understanding of the foundation of the nuclear force, this binding interaction in nuclei operates at low energy, where the force is strong and difficult to calculate directly from the theory. For that reason, a common parameterization of the effective interaction between nucleons is based on experimental measurements, and the corresponding parameterization for antinucleons remains undetermined. Ultra-relativistic nuclear collisions produce an energy density similar to that of the Universe microseconds after the Big Bang, and the high energy density creates a favourable environment for antimatter production. The abundantly produced antiprotons provide the opportunity to measure, for the first time, the parameters f 0 and d 0 of the strong nuclear force between antinucleons rather than nucleons.The technique used to probe the antiproton-antiproton interaction involves momentum correlations, and it resembles the space-time correlation technique used in Hanbury-Brown and Twiss (HBT) intensity interferometry. Since its invention for use in astronomy by Robert Hanbury-

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Section: Methodsmentioning

confidence: 99%

Section: S(+)mentioning

confidence: 99%

Measurement of interaction between antiprotons

Adamczyk

Adkins

Agakishiev

et al. 2015

Nature

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“…The interaction for pp system is measured in detail and well described theoretically, we will use existing calculations for this system and will not vary any of its parameters in the fits. For details please see [14]. For all other pairs the strong FSI is the only source of femtoscopic correlation.…”

Section: Femtoscopic Formalismmentioning

confidence: 99%

Extracting baryon-antibaryon strong-interaction potentials frompΛ¯femtoscopic correlation functions

2014

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The STAR experiment has measured pΛ,pΛ,pΛ, and pΛ femtoscopic correlation functions in central Au+Au collisions at √ sNN = 200 GeV. The system size extracted for pΛ andpΛ is consistent with model expectations and results for other pair types, while for pΛ andpΛ it is not consistent with the other two and significantly lower. In addition an attempt was made to extract the unknown parameters of the strong interaction potential for this baryon-antibaryon (BB) pair. In this work we reanalyze the STAR data, taking into account residual femtoscopic correlations from heavier BB pairs. We obtain new estimates for the system size, consistent with the results for pΛ andpΛ pairs and with model expectations. We give new estimates for the strong interaction potential parameters for pΛ and show that similar constraints can be given for parameters for other, heavier BB pairs.

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“…A more accurate extraction of f c is done by fitting mixed-charge two-pion correlations instead [24]. The correlation between π + and π − is dominated by Coulomb and strong FSI for which the wave functions are well known [35]. Owing to the large pion Bohr radius, π + π − correlations are less sensitive to the detailed structure of the source and can be fit less ambiguously with respect to π + π + correlations.…”

Section: Analysis Techniquementioning

confidence: 99%

Multipion Bose-Einstein correlations inpp,p-Pb, and Pb-Pb collisions at energies available at the CERN Large Hadron Collider

et al. 2016

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Three-and four-pion Bose-Einstein correlations are presented in pp, p-Pb, and Pb-Pb collisions at the LHC. We compare our measured four-pion correlations to the expectation derived from two-and three-pion measurements. Such a comparison provides a method to search for coherent pion emission. We also present mixed-charge correlations in order to demonstrate the effectiveness of several analysis procedures such as Coulomb corrections. Same-charge four-pion correlations in pp and p-Pb appear consistent with the expectations from three-pion measurements. However, the presence of non-negligible background correlations in both systems prevent a conclusive statement. In Pb-Pb collisions, we observe a significant suppression of three-and four-pion Bose-Einstein correlations compared to expectations from two-pion measurements. There appears to be no centrality dependence of the suppression within the 0%-50% centrality interval. The origin of the suppression is not clear. However, by postulating either coherent pion emission or large multibody Coulomb effects, the suppression may be explained.

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Finite-size effect on two-particle production in continuous and discrete spectrum

Cited by 89 publications

References 45 publications

Measurement of interaction between antiprotons

Measurement of interaction between antiprotons

Extracting baryon-antibaryon strong-interaction potentials frompΛ¯femtoscopic correlation functions

Multipion Bose-Einstein correlations inpp,p-Pb, and Pb-Pb collisions at energies available at the CERN Large Hadron Collider

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