Lambda hyperon production and polarization in collisions of p(3.5 GeV)+Nb

Agakishiev, G.; Arnold, O.; Balanda, A.; Belver, D.; Belyaev, A. V.; Berger-Chen, J. C.; Blanco, A.; Böhmer, M.; Boyard, J. L.; Cabanelas, P.; Chernenko, S.; Dybczak, A.; Epple, E.; Fabbietti, L.; Krása, Antonín; Křížek, Filip; Kugler, Andrej; Sobolev, Yuri, G.; Tlustý, Pavel; Wagner, Vladimír

doi:https://dx.doi.org/10.1140/epja/i2014-14081-2

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Lambda hyperon production and polarization in collisions of p(3.5 GeV)+Nb

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SYSNO ASEP	0428663
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Článek ve WOS
Title	Lambda hyperon production and polarization in collisions of p(3.5 GeV)+Nb
Author(s)	Agakishiev, G. (RU) Arnold, O. (DE) Balanda, A. (PL) Belver, D. (ES) Belyaev, A. V. (RU) Berger-Chen, J. C. (DE) Blanco, A. (PT) Böhmer, M. (DE) Boyard, J. L. (FR) Cabanelas, P. (ES) Chernenko, S. (RU) Dybczak, A. (PL) Epple, E. (DE) Fabbietti, L. (DE) Krása, Antonín (UJF-V) Křížek, Filip (UJF-V)_{RID, ORCID, SAI} Kugler, Andrej (UJF-V)_{RID, ORCID, SAI} Sobolev, Yuri, G. (UJF-V)_ORCID Tlustý, Pavel (UJF-V)_{ORCID, SAI} Wagner, Vladimír (UJF-V)_{RID, ORCID, SAI}
Number of authors	98
Source Title	European Physical Journal A. - : Springer - ISSN 1434-6001 Roč. 50, č. 5 (2014), s. 81
Number of pages	13 s.
Publication form	Print - P
Language	eng - English
Country	US - United States
Keywords	heavy ion collisions ; HADES ; spectrometer
Subject RIV	BG - Nuclear, Atomic and Molecular Physics, Colliders
R&D Projects	GA13-06759S GA ČR - Czech Science Foundation (CSF)
	LG14004 GA MŠMT - Ministry of Education, Youth and Sports (MEYS)
Institutional support	UJF-V - RVO:61389005
UT WOS	000335735700001
DOI	10.1140/epja/i2014-14081-2
Annotation	Results on. hyperon production are reported for collisions of p(3.5 GeV) + Nb, studied with the High-Acceptance Di-Electron Spectrometer (HADES) at SIS18 at GSI Helmholtzzentrum for Heavy-Ion Research, Darmstadt. The transverse mass distributions in rapidity bins are well described by Boltzmann shapes with a maximum inverse slope parameter of about 90 MeV at a rapidity of y = 1.0, i.e. slightly below the center-of-mass rapidity for nucleon-nucleon collisions, y(cm) = 1.12. The rapidity density decreases monotonically with increasing rapidity within a rapidity window ranging from 0.3 to 1.3. The Lambda phase-space distribution is compared with results of other experiments and with predictions of two transport approaches which are available publicly. None of the present versions of the employed models is able to fully reproduce the experimental distributions, i.e. in absolute yield and in shape. Presumably, this finding results from an insufficient modelling in the transport models of the elementary processes being relevant for Lambda production, rescattering and absorption. The present high-statistics data allow for a genuine two-dimensional investigation as a function of phase space of the self-analyzing Lambda polarization in the weak decay Lambda -> p pi(-). Finite negative values of the polarization in the order of 5-20% are observed over the entire phase space studied. The absolute value of the polarization increases almost linearly with increasing transverse momentum for p(t) > 300 MeV/c and increases with decreasing rapidity for y < 0.8.
Workplace	Nuclear Physics Institute
Contact	Markéta Sommerová, sommerova@ujf.cas.cz, Tel.: 266 173 228
Year of Publishing	2015

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