Lambda p interaction studied via femtoscopy in p plus Nb reactions at root s(NN)=3.18 GeV

0462438 - ÚJF 2017 RIV US eng J - Článek v odborném periodiku
Adamczewski-Musch, J. - Agakishiev, G. - Arnold, O. - Atomssa, E. T. - Behnke, C. - Krása, Antonín - Kugler, Andrej - Sobolev, Yuri, G. - Tlustý, Pavel - Wagner, Vladimír … celkem 108 autorů
Lambda p interaction studied via femtoscopy in p plus Nb reactions at root s(NN)=3.18 GeV.
Physical Review C. Roč. 94, č. 2 (2016), s. 025201. ISSN 2469-9985. E-ISSN 2469-9993
Grant CEP: GA ČR GA13-06759S; GA MŠMT LC07050
Institucionální podpora: RVO:61389005
Klíčová slova: HADES collaboration * heavy ion collisions * correlation funciton
Kód oboru RIV: BG - Jaderná, atomová a mol. fyzika, urychlovače
Impakt faktor: 3.820, rok: 2016

We report on the first measurement of p Lambda and pp correlations via the femtoscopy method in p + Nb reactions at root sNN = 3.18 GeV, studied with the High Acceptance Di-Electron Spectrometer (HADES). By comparing the experimental correlation function to model calculations, a source size for pp pairs of r(0,pp) = 2.02 +/- 0.01(stat)(-0.12)(+0.11)(sys) fm and a slightly smaller value for p Lambda pairs of r(0,Lambda p) = 1.62 +/- 0.02(stat)(-0.08)(+0.19)(sys) fm are extracted. Using the geometrical extent of the particle-emitting region, determined experimentally with pp correlations as reference together with a source function from a transport model, it is possible to study different sets of scattering parameters. The p Lambda correlation is proven to be sensitive to predicted scattering length values from chiral effective field theory. We demonstrate that the femtoscopy technique can be used as a valid alternative to the analysis of scattering data to study the hyperon-nucleon interaction.
Trvalý link: http://hdl.handle.net/11104/0261909