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

Počet záznamů: 1

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

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SYSNO ASEP	0428663
Druh ASEP	J - Článek v odborném periodiku
Zařazení RIV	J - Článek v odborném periodiku
Poddruh J	Článek ve WOS
Název	Lambda hyperon production and polarization in collisions of p(3.5 GeV)+Nb
Tvůrce(i)	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}
Celkový počet autorů	98
Zdroj.dok.	European Physical Journal A. - : Springer - ISSN 1434-6001 Roč. 50, č. 5 (2014), s. 81
Poč.str.	13 s.
Forma vydání	Tištěná - P
Jazyk dok.	eng - angličtina
Země vyd.	US - Spojené státy americké
Klíč. slova	heavy ion collisions ; HADES ; spectrometer
Vědní obor RIV	BG - Jaderná, atomová a mol. fyzika, urychlovače
CEP	GA13-06759S GA ČR - Grantová agentura ČR
	LG14004 GA MŠMT - Ministerstvo školství, mládeže a tělovýchovy
Institucionální podpora	UJF-V - RVO:61389005
UT WOS	000335735700001
DOI	10.1140/epja/i2014-14081-2
Anotace	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.
Pracoviště	Ústav jaderné fyziky
Kontakt	Markéta Sommerová, sommerova@ujf.cas.cz, Tel.: 266 173 228
Rok sběru	2015

Počet záznamů: 1