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

2014
journal article
article
32
dc.abstract.enResults on $\Lambda$ 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 \rightarrow 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.pl
dc.affiliationWydział Fizyki, Astronomii i Informatyki Stosowanej : Instytut Fizyki im. Mariana Smoluchowskiegopl
dc.contributor.authorAgakishiev, G.pl
dc.contributor.authorArnold, O.pl
dc.contributor.authorBalanda, A.pl
dc.contributor.authorBelver, D.pl
dc.contributor.authorBelyaev, A. V.pl
dc.contributor.authorBerger-Chen, J. C.pl
dc.contributor.authorBlanco, A.pl
dc.contributor.authorBöhmer, M.pl
dc.contributor.authorBoyard, J. L.pl
dc.contributor.authorCabanelas, P.pl
dc.contributor.authorChernenko, S.pl
dc.contributor.authorDybczak, Adrianpl
dc.contributor.authorEpple, E.pl
dc.contributor.authorFabbietti, L.pl
dc.contributor.authorFateev, O. V.pl
dc.contributor.authorFinocchiaro, P.pl
dc.contributor.authorFonte, P.pl
dc.contributor.authorFriese, J.pl
dc.contributor.authorFröhlich, I.pl
dc.contributor.authorGalatyuk, T.pl
dc.contributor.authorGarzón, J. A.pl
dc.contributor.authorGernhäuser, R.pl
dc.contributor.authorGöbel, K.pl
dc.contributor.authorGolubeva, M.pl
dc.contributor.authorGonzález-Díaz, D.pl
dc.contributor.authorGuber, F.pl
dc.contributor.authorGumberidze, M.pl
dc.contributor.authorHeinz, T.pl
dc.contributor.authorHennino, T.pl
dc.contributor.authorHolzmann, R.pl
dc.contributor.authorIerusalimov, A.pl
dc.contributor.authorIori, I.pl
dc.contributor.authorIvashkin, A.pl
dc.contributor.authorJurkovic, M.pl
dc.contributor.authorKämpfer, B.pl
dc.contributor.authorKaravicheva, T.pl
dc.contributor.authorKoenig, I.pl
dc.contributor.authorKoenig, W.pl
dc.contributor.authorKolb, B. W.pl
dc.contributor.authorKornakov, G.pl
dc.contributor.authorKotte, R.pl
dc.contributor.authorKrása, A.pl
dc.contributor.authorKrizek, F.pl
dc.contributor.authorKrücken, R.pl
dc.contributor.authorKuc, Hubert - 184961 pl
dc.contributor.authorKühn, W.pl
dc.contributor.authorKugler, A.pl
dc.contributor.authorKurepin, A.pl
dc.contributor.authorLadygin, V.pl
dc.contributor.authorLalik, R.pl
dc.contributor.authorLang, S.pl
dc.contributor.authorLapidus, K.pl
dc.contributor.authorLebedev, A.pl
dc.contributor.authorLiu, T.pl
dc.contributor.authorLopes, L.pl
dc.contributor.authorLorenz, M.pl
dc.contributor.authorMaier, L.pl
dc.contributor.authorMangiarotti, A.pl
dc.contributor.authorMarkert, J.pl
dc.contributor.authorMetag, V.pl
dc.contributor.authorMichalska, Beatapl
dc.contributor.authorMichel, J.pl
dc.contributor.authorMüntz, C.pl
dc.contributor.authorNaumann, L.pl
dc.contributor.authorPachmayer, Y. C.pl
dc.contributor.authorPałka, Marek - 214237 pl
dc.contributor.authorParpottas, Y.pl
dc.contributor.authorPechenov, V.pl
dc.contributor.authorPechenova, O.pl
dc.contributor.authorPietraszko, J.pl
dc.contributor.authorPrzygoda, Witold - 100454 pl
dc.contributor.authorRamstein, B.pl
dc.contributor.authorReshetin, A.pl
dc.contributor.authorRustamov, A.pl
dc.contributor.authorSadovsky, A.pl
dc.contributor.authorSalabura, Piotr - 102313 pl
dc.contributor.authorSchmah, A.pl
dc.contributor.authorSchwab, E.pl
dc.contributor.authorSiebenson, J.pl
dc.contributor.authorSobolev, Yu. G.pl
dc.contributor.authorSpataro, S.pl
dc.contributor.authorSpruck, B.pl
dc.contributor.authorStröbele, H.pl
dc.contributor.authorStroth, J.pl
dc.contributor.authorSturm, C.pl
dc.contributor.authorTarantola, A.pl
dc.contributor.authorTeilab, K.pl
dc.contributor.authorTlusty, P.pl
dc.contributor.authorTraxler, M.pl
dc.contributor.authorTrębacz, Radosławpl
dc.contributor.authorTsertos, H.pl
dc.contributor.authorVasiliev, T.pl
dc.contributor.authorWagner, V.pl
dc.contributor.authorWeber, M.pl
dc.contributor.authorWendisch, C.pl
dc.contributor.authorWüstenfeld, J.pl
dc.contributor.authorYurevich, S.pl
dc.contributor.authorZanevsky, Y. V.pl
dc.contributor.institutionHADES Collaborationpl
dc.date.accessioned2015-06-02T11:50:12Z
dc.date.available2015-06-02T11:50:12Z
dc.date.issued2014pl
dc.description.admin[AB] Dybczak, Adrian 50000139
dc.description.admin[AB] Trębacz, Radosław 50000139
dc.description.admin[AB] Michalska, Beata 50000139
dc.description.number5pl
dc.description.publication1pl
dc.description.volume50pl
dc.identifier.articleid81
dc.identifier.doi10.1140/epja/i2014-14081-2pl
dc.identifier.eissn1434-601Xpl
dc.identifier.issn1434-6001pl
dc.identifier.urihttp://ruj.uj.edu.pl/xmlui/handle/item/8709
dc.languageengpl
dc.language.containerengpl
dc.rightsDodaję tylko opis bibliograficzny*
dc.rights.licencebez licencji
dc.rights.uri*
dc.subtypeArticlepl
dc.titleLambda hyperon production and polarization in collisions of p(3.5 GeV)+Nbpl
dc.title.journalThe European Physical Journal. A, Hadrons and Nucleipl
dc.typeJournalArticlepl
dspace.entity.typePublication
dc.abstract.enpl
Results on $\Lambda$ 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 \rightarrow 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.
dc.affiliationpl
Wydział Fizyki, Astronomii i Informatyki Stosowanej : Instytut Fizyki im. Mariana Smoluchowskiego
dc.contributor.authorpl
Agakishiev, G.
dc.contributor.authorpl
Arnold, O.
dc.contributor.authorpl
Balanda, A.
dc.contributor.authorpl
Belver, D.
dc.contributor.authorpl
Belyaev, A. V.
dc.contributor.authorpl
Berger-Chen, J. C.
dc.contributor.authorpl
Blanco, A.
dc.contributor.authorpl
Böhmer, M.
dc.contributor.authorpl
Boyard, J. L.
dc.contributor.authorpl
Cabanelas, P.
dc.contributor.authorpl
Chernenko, S.
dc.contributor.authorpl
Dybczak, Adrian
dc.contributor.authorpl
Epple, E.
dc.contributor.authorpl
Fabbietti, L.
dc.contributor.authorpl
Fateev, O. V.
dc.contributor.authorpl
Finocchiaro, P.
dc.contributor.authorpl
Fonte, P.
dc.contributor.authorpl
Friese, J.
dc.contributor.authorpl
Fröhlich, I.
dc.contributor.authorpl
Galatyuk, T.
dc.contributor.authorpl
Garzón, J. A.
dc.contributor.authorpl
Gernhäuser, R.
dc.contributor.authorpl
Göbel, K.
dc.contributor.authorpl
Golubeva, M.
dc.contributor.authorpl
González-Díaz, D.
dc.contributor.authorpl
Guber, F.
dc.contributor.authorpl
Gumberidze, M.
dc.contributor.authorpl
Heinz, T.
dc.contributor.authorpl
Hennino, T.
dc.contributor.authorpl
Holzmann, R.
dc.contributor.authorpl
Ierusalimov, A.
dc.contributor.authorpl
Iori, I.
dc.contributor.authorpl
Ivashkin, A.
dc.contributor.authorpl
Jurkovic, M.
dc.contributor.authorpl
Kämpfer, B.
dc.contributor.authorpl
Karavicheva, T.
dc.contributor.authorpl
Koenig, I.
dc.contributor.authorpl
Koenig, W.
dc.contributor.authorpl
Kolb, B. W.
dc.contributor.authorpl
Kornakov, G.
dc.contributor.authorpl
Kotte, R.
dc.contributor.authorpl
Krása, A.
dc.contributor.authorpl
Krizek, F.
dc.contributor.authorpl
Krücken, R.
dc.contributor.authorpl
Kuc, Hubert - 184961
dc.contributor.authorpl
Kühn, W.
dc.contributor.authorpl
Kugler, A.
dc.contributor.authorpl
Kurepin, A.
dc.contributor.authorpl
Ladygin, V.
dc.contributor.authorpl
Lalik, R.
dc.contributor.authorpl
Lang, S.
dc.contributor.authorpl
Lapidus, K.
dc.contributor.authorpl
Lebedev, A.
dc.contributor.authorpl
Liu, T.
dc.contributor.authorpl
Lopes, L.
dc.contributor.authorpl
Lorenz, M.
dc.contributor.authorpl
Maier, L.
dc.contributor.authorpl
Mangiarotti, A.
dc.contributor.authorpl
Markert, J.
dc.contributor.authorpl
Metag, V.
dc.contributor.authorpl
Michalska, Beata
dc.contributor.authorpl
Michel, J.
dc.contributor.authorpl
Müntz, C.
dc.contributor.authorpl
Naumann, L.
dc.contributor.authorpl
Pachmayer, Y. C.
dc.contributor.authorpl
Pałka, Marek - 214237
dc.contributor.authorpl
Parpottas, Y.
dc.contributor.authorpl
Pechenov, V.
dc.contributor.authorpl
Pechenova, O.
dc.contributor.authorpl
Pietraszko, J.
dc.contributor.authorpl
Przygoda, Witold - 100454
dc.contributor.authorpl
Ramstein, B.
dc.contributor.authorpl
Reshetin, A.
dc.contributor.authorpl
Rustamov, A.
dc.contributor.authorpl
Sadovsky, A.
dc.contributor.authorpl
Salabura, Piotr - 102313
dc.contributor.authorpl
Schmah, A.
dc.contributor.authorpl
Schwab, E.
dc.contributor.authorpl
Siebenson, J.
dc.contributor.authorpl
Sobolev, Yu. G.
dc.contributor.authorpl
Spataro, S.
dc.contributor.authorpl
Spruck, B.
dc.contributor.authorpl
Ströbele, H.
dc.contributor.authorpl
Stroth, J.
dc.contributor.authorpl
Sturm, C.
dc.contributor.authorpl
Tarantola, A.
dc.contributor.authorpl
Teilab, K.
dc.contributor.authorpl
Tlusty, P.
dc.contributor.authorpl
Traxler, M.
dc.contributor.authorpl
Trębacz, Radosław
dc.contributor.authorpl
Tsertos, H.
dc.contributor.authorpl
Vasiliev, T.
dc.contributor.authorpl
Wagner, V.
dc.contributor.authorpl
Weber, M.
dc.contributor.authorpl
Wendisch, C.
dc.contributor.authorpl
Wüstenfeld, J.
dc.contributor.authorpl
Yurevich, S.
dc.contributor.authorpl
Zanevsky, Y. V.
dc.contributor.institutionpl
HADES Collaboration
dc.date.accessioned
2015-06-02T11:50:12Z
dc.date.available
2015-06-02T11:50:12Z
dc.date.issuedpl
2014
dc.description.admin
[AB] Dybczak, Adrian 50000139
dc.description.admin
[AB] Trębacz, Radosław 50000139
dc.description.admin
[AB] Michalska, Beata 50000139
dc.description.numberpl
5
dc.description.publicationpl
1
dc.description.volumepl
50
dc.identifier.articleid
81
dc.identifier.doipl
10.1140/epja/i2014-14081-2
dc.identifier.eissnpl
1434-601X
dc.identifier.issnpl
1434-6001
dc.identifier.uri
http://ruj.uj.edu.pl/xmlui/handle/item/8709
dc.languagepl
eng
dc.language.containerpl
eng
dc.rights*
Dodaję tylko opis bibliograficzny
dc.rights.licence
bez licencji
dc.rights.uri*
dc.subtypepl
Article
dc.titlepl
Lambda hyperon production and polarization in collisions of p(3.5 GeV)+Nb
dc.title.journalpl
The European Physical Journal. A, Hadrons and Nuclei
dc.typepl
JournalArticle
dspace.entity.type
Publication
Affiliations

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