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The production of Σ0 baryons in the nuclear reaction p (3.5 GeV) + Nb (corresponding to sNN=3.18 GeV) is studied with the detector set-up HADES at GSI, Darmstadt. Σ0s were identified via the decay Σ0→Λγ with subsequent decays Λ→pπ− in coincidence with a e+e− pair from either external (γ→e+e−) or internal (Dalitz decay γ⁎→e+e−) gamma conversions. The differential Σ0 cross section integrated over the detector acceptance, i.e. the rapidity interval 0.5<1.1, has been extracted as ΔσΣjavax.xml.bind.JAXBElement@4f76a956=2.3±(0.2)stat±(−0.6+0.6)sys±(0.2)norm mb, yielding the inclusive production cross section in full phase space σΣjavax.xml.bind.JAXBElement@38c26a07total=5.8±(0.5)stat±(−1.4+1.4)sys±(0.6)norm±(1.7)extrapol mb by averaging over different extrapolation methods. The Λall/Σ0 ratio within the HADES acceptance is equal to 2.3±(0.2)stat±(−0.6+0.6)sys. The obtained rapidity and momentum distributions are compared to transport model calculations. The Σ0 yield agrees with the statistical model of particle production in nuclear reactions.

Σ0 production in proton nucleus collisions near threshold

Adamczewski-Musch J.;Agakishiev G.;Arnold O.;Atomssa E. T.;Behnke C.;Berger-Chen J. C.;Biernat J.;Blanco A.;Blume C.;Bohmer M.;Bordalo P.;Chernenko S.;Deveaux C.;Dybczak A.;Epple E.;Fabbietti L.;Fateev O.;Fonte P.;Franco C.;Friese J.;Frohlich I.;Galatyuk T.;Garzon J. A.;Gernhauser R.;Gill K.;Golubeva M.;Guber F.;Gumberidze M.;Harabasz S.;Hennino T.;Hlavac S.;Hohne C.;Holzmann R.;Ierusalimov A.;Ivashkin A.;Jurkovic M.;Kampfer B.;Karavicheva T.;Kardan B.;Koenig I.;Koenig W.;Kolb B. W.;Korcyl G.;Kornakov G.;Kotte R.;Krasa A.;Krebs E.;Kuc H.;Kugler A.;Kunz T.;Kurepin A.;Kurilkin A.;Kurilkin P.;Ladygin V.;Lalik R.;Lapidus K.;Lebedev A.;Lopes L.;Lorenz M.;Mahmoud T.;Maier L.;Maurus S.;Mangiarotti A.;Markert J.;Metag V.;Michel J.;Muntz C.;Munzer R.;Naumann L.;Palka M.;Parpottas Y.;Pechenov V.;Pechenova O.;Petousis V.;Pietraszko J.;Przygoda W.;Ramos S.;Ramstein B.;Rehnisch L.;Reshetin A.;Rost A.;Rustamov A.;Sadovsky A.;Salabura P.;Scheib T.;Schmidt-Sommerfeld K.;Schuldes H.;Sellheim P.;Siebenson J.;Silva L.;Sobolev Y. G.;Spataro S.;Strobele H.;Stroth J.;Strzempek P.;Sturm C.;Svoboda O.;Tarantola A.;Teilab K.;Tlusty P.;Traxler M.;Tsertos H.;Vasiliev T.;Wagner V.;Wendisch C.;Wirth J.;Wustenfeld J.;Zanevsky Y.;Zumbruch P.

2018-01-01

Abstract

The production of Σ0 baryons in the nuclear reaction p (3.5 GeV) + Nb (corresponding to sNN=3.18 GeV) is studied with the detector set-up HADES at GSI, Darmstadt. Σ0s were identified via the decay Σ0→Λγ with subsequent decays Λ→pπ− in coincidence with a e+e− pair from either external (γ→e+e−) or internal (Dalitz decay γ⁎→e+e−) gamma conversions. The differential Σ0 cross section integrated over the detector acceptance, i.e. the rapidity interval 0.5<1.1, has been extracted as ΔσΣjavax.xml.bind.JAXBElement@4f76a956=2.3±(0.2)stat±(−0.6+0.6)sys±(0.2)norm mb, yielding the inclusive production cross section in full phase space σΣjavax.xml.bind.JAXBElement@38c26a07total=5.8±(0.5)stat±(−1.4+1.4)sys±(0.6)norm±(1.7)extrapol mb by averaging over different extrapolation methods. The Λall/Σ0 ratio within the HADES acceptance is equal to 2.3±(0.2)stat±(−0.6+0.6)sys. The obtained rapidity and momentum distributions are compared to transport model calculations. The Σ0 yield agrees with the statistical model of particle production in nuclear reactions.

Scheda breve

Scheda completa

Scheda completa (DC)

	Anno
	
			2018
		
	Titolo rivista
	
			PHYSICS LETTERS. SECTION B
		
	N. Volume
	
			781
		
	Pagine (da)
	
			735
		
	Pagine (a)
	
			740
		
	DOI
	
			https://dx.doi.org/10.1016/j.physletb.2018.02.043
		
	URL del prodotto (archivi open access, fulltext su sito editore, etc.)
	
			https://www.sciencedirect.com/science/article/pii/S0370269318301539?via=ihub
		
	Parole Chiave
	
			Hyperons; Nucleus; Proton; Strangeness
		
	Tutti gli autori
	
			Adamczewski-Musch J.; Agakishiev G.; Arnold O.; Atomssa E.T.; Behnke C.; Berger-Chen J.C.; Biernat J.; Blanco A.; Blume C.; Bohmer M.; Bordalo P.; Chernenko S.; Deveaux C.; Dybczak A.; Epple E.; Fabbietti L.; Fateev O.; Fonte P.; Franco C.; Friese J.; Frohlich I.; Galatyuk T.; Garzon J.A.; Gernhauser R.; Gill K.; Golubeva M.; Guber F.; Gumberidze M.; Harabasz S.; Hennino T.; Hlavac S.; Hohne C.; Holzmann R.; Ierusalimov A.; Ivashkin A.; Jurkovic M.; Kampfer B.; Karavicheva T.; Kardan B.; Koenig I.; Koenig W.; Kolb B.W.; Korcyl G.; Kornakov G.; Kotte R.; Krasa A.; Krebs E.; Kuc H.; Kugler A.; Kunz T.; Kurepin A.; Kurilkin A.; Kurilkin P.; Ladygin V.; Lalik R.; Lapidus K.; Lebedev A.; Lopes L.; Lorenz M.; Mahmoud T.; Maier L.; Maurus S.; Mangiarotti A.; Markert J.; Metag V.; Michel J.; Muntz C.; Munzer R.; Naumann L.; Palka M.; Parpottas Y.; Pechenov V.; Pechenova O.; Petousis V.; Pietraszko J.; Przygoda W.; Ramos S.; Ramstein B.; Rehnisch L.; Reshetin A.; Rost A.; Rustamov A.; Sadovsky A.; Salabura P.; Scheib T.; Schmidt-Sommerfeld K.; Schuldes H.; Sellheim P.; Siebenson J.; Silva L.; Sobolev Y.G.; Spataro S.; Strobele H.; Stroth J.; Strzempek P.; Sturm C.; Svoboda O.; Tarantola A.; Teilab K.; Tlusty P.; Traxler M.; Tsertos H.; Vasiliev T.; Wagner V.; Wendisch C.; Wirth J.; Wustenfeld J.; Zanevsky Y.; Zumbruch P.
		
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/1804118

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