dorsal/arxiv
View SchemaResonance contributions to HBT correlation radii
| Authors | Urs Achim Wiedemann, Ulrich Heinz |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9611031 |
| URL | https://arxiv.org/abs/nucl-th/9611031 |
| DOI | 10.1103/PhysRevC.56.3265 |
| Journal | Phys.Rev.C56:3265-3286,1997 |
Abstract
We study the effect of resonance decays on intensity interferometry for heavy ion collisions. Collective expansion of the source leads to a dependence of the two-particle correlation function on the pair momentum K. This opens the possibility to reconstruct the dynamics of the source from the K-dependence of the measured HBT radii. Here we address the question to what extent resonance decays can fake such a flow signal. Within a simple parametrization for the emission function we present a comprehensive analysis of the interplay of flow and resonance decays on the one- and two-particle spectra. We discuss in detail the non-Gaussian features of the correlation function introduced by long-lived resonances and the resulting problems in extracting meaningful HBT radii. We propose to define them in terms of the second order q-moments of the correlator C(q, K). We show that this yields a more reliable characterisation of the correlator in terms of its width and the correlation strength `lambda' than other commonly used fit procedures. The normalized fourth-order q-moments (kurtosis) provide a quantitative measure for the non-Gaussian features of the correlator. At least for the class of models studied here, the kurtosis helps separating effects from expansion flow and resonance decays, and provides the cleanest signal to distinguish between scenarios with and without transverse flow.
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"abstract": "We study the effect of resonance decays on intensity interferometry for heavy\nion collisions. Collective expansion of the source leads to a dependence of the\ntwo-particle correlation function on the pair momentum K. This opens the\npossibility to reconstruct the dynamics of the source from the K-dependence of\nthe measured HBT radii. Here we address the question to what extent resonance\ndecays can fake such a flow signal. Within a simple parametrization for the\nemission function we present a comprehensive analysis of the interplay of flow\nand resonance decays on the one- and two-particle spectra. We discuss in detail\nthe non-Gaussian features of the correlation function introduced by long-lived\nresonances and the resulting problems in extracting meaningful HBT radii. We\npropose to define them in terms of the second order q-moments of the correlator\nC(q, K). We show that this yields a more reliable characterisation of the\ncorrelator in terms of its width and the correlation strength `lambda\u0027 than\nother commonly used fit procedures. The normalized fourth-order q-moments\n(kurtosis) provide a quantitative measure for the non-Gaussian features of the\ncorrelator. At least for the class of models studied here, the kurtosis helps\nseparating effects from expansion flow and resonance decays, and provides the\ncleanest signal to distinguish between scenarios with and without transverse\nflow.",
"arxiv_id": "nucl-th/9611031",
"authors": [
"Urs Achim Wiedemann",
"Ulrich Heinz"
],
"categories": [
"nucl-th",
"hep-ph"
],
"doi": "10.1103/PhysRevC.56.3265",
"journal_ref": "Phys.Rev.C56:3265-3286,1997",
"title": "Resonance contributions to HBT correlation radii",
"url": "https://arxiv.org/abs/nucl-th/9611031"
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