Correlated pion-proton pair emission off hot and dense QCD matter
Abstract
In this letter we report the first multi-differential measurement of correlated pion-proton pairs from 2 billion Au+Au collisions at \sqrt{s_{NN}} = 2.42 GeV collected with HADES. In this energy regime the population of \Delta(1232) resonances plays an important role in the way energy is distributed between intrinsic excitation energy and kinetic energy of the hadrons in the fireball. The triple differential d3N/dM{\pi}pdpTdy distributions of correlated {\pi}p pairs have been determined by subtracting the {\pi}p combinatorial background using an iterative method. The invariant-mass distributions in the \Delta(1232) mass region show strong deviations from a Breit-Wigner function with vacuum width and mass. The yield of correlated pion-proton pairs exhibits a complex isospin, rapidity and transverse-momentum dependence. In the invariant mass range 1.1 < Minv (GeV/c2) < 1.4, the yield is found to be similar for {\pi}+p and {\pi}-p pairs, and to follow a power law <Apart>^{\alpha}, where <Apart> is the mean number of participating nucleons. The exponent {\alpha} depends strongly on the pair transverse momentum (pT) while its pT-integrated and charge-averaged value is {\alpha} = 1.5 \pm 0.08stat \pm 0.2sys.
Keywords
Cite
@article{arxiv.2012.01351,
title = {Correlated pion-proton pair emission off hot and dense QCD matter},
author = {J. Adamczewski-Musch and O. Arnold and C. Behnke and A. Belounnas and A. Belyaev and J. C. Berger-Chen and A. Blanco and C. Blume and M. B"ohmer and P. Bordalo and S. Chernenko and L. Chlad and I. Ciepal and C. Deveaux and J. Dreyer and E. Epple and L. Fabbietti and O. Fateev and P. Filip and P. Fonte and C. Franco and J. Friese and I. Fr"ohlich and T. Galatyuk and J. A. Garzon and R. Gernh"auser and M. Golubeva and R. Greifenhagen and F. Guber and M. Gumberidze and S. Harabasz and T. Heinz and T. Hennino and S. Hlavac and C. H"ohne and R. Holzmann and A. Ierusalimov and A. Ivashkin and B. K"ampfer and T. Karavicheva and B. Kardan and I. Koenig and W. Koenig and M. Kohls and B. W. Kolb and G. Korcyl and G. Kornakov and F. Kornas and R. Kotte and A. Kugler and T. Kunz and A. Kurepin and A. Kurilkin and P. Kurilkin and V. Ladygin and R. Lalik and K. Lapidus and A. Lebedev and L. Lopes and M. Lorenz and T. Mahmoud and L. Maier and A. Malige and A. Mangiarotti and J. Markert and T. Matulewicz and S. Maurus and V. Metag and J. Michel and D. M. Mihaylov and S. Morozov and C. M"untz and R. M"unzer and L. Naumann and K. Nowakowski and Y. Parpottas and V. Pechenov and O. Pechenova and O. Petukhov and K. Piasecki and J. Pietraszko and W. Przygoda and K. Pysz and S. Ramos and B. Ramstein and N. Rathod and A. Reshetin and P. Rodriguez-Ramos and P. Rosier and A. Rost and A. Sadovsky and P. Salabura and T. Scheib and H. Schuldes and E. Schwab and F. Scozzi and F. Seck and P. Sellheim and I. Selyuzhenkov and J. Siebenson and L. Silva and U. Singh and J. Smyrski and Yu. G. Sobolev and S. Spataro and S. Spies and H. Str"obele and J. Stroth and C. Sturm and O. Svoboda and M. Szala and P. Tlusty and M. Traxler and H. Tsertos and E. Usenko and V. Wagner and C. Wendisch and M. G. Wiebusch and J. Wirth and D. Wojcik and Y. Zanevsky and P. Zumbruch},
journal= {arXiv preprint arXiv:2012.01351},
year = {2021}
}
Comments
9 pages, 9 figures