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Institute
The production of J/ψ and ψ(2S) was measured with the ALICE detector in Pb-Pb collisions at the LHC. The measurement was performed at forward rapidity (2.5<y<4) down to zero transverse momentum (pT) in the dimuon decay channel. Inclusive J/ψ yields were extracted in different centrality classes and the centrality dependence of the average pT is presented. The J/ψ suppression, quantified with the nuclear modification factor (RAA), was studied as a function of centrality, transverse momentum and rapidity. Comparisons with similar measurements at lower collision energy and theoretical models indicate that the J/ψ production is the result of an interplay between color screening and recombination mechanisms in a deconfined partonic medium, or at its hadronization. Results on the ψ(2S) suppression are provided via the ratio of ψ(2S) over J/ψ measured in pp and Pb-Pb collisions.
The production of J/ψ and ψ(2S) was measured with the ALICE detector in Pb-Pb collisions at the LHC. The measurement was performed at forward rapidity (2.5<y<4) down to zero transverse momentum (pT) in the dimuon decay channel.
Inclusive J/ψ yields were extracted in different centrality classes and the centrality dependence of the average pT is presented. The J/ψ suppression, quantified with the nuclear modification factor (RAA), was studied as a function of centrality, transverse momentum and rapidity. Comparisons with similar measurements at lower collision energy and theoretical models indicate that the J/ψ production is the result of an interplay between color screening and recombination mechanisms in a deconfined partonic medium, or at its hadronization. Results on the ψ(2S) suppression are provided via the ratio of ψ(2S) over J/ψ measured in pp and Pb-Pb collisions.
We present a measurement of inclusive J/ψ production in p-Pb collisions at sNN−−−√ = 5.02 TeV as a function of the centrality of the collision, as estimated from the energy deposited in the Zero Degree Calorimeters. The measurement is performed with the ALICE detector down to zero transverse momentum, pT, in the backward (−4.46<ycms<−2.96) and forward (2.03<ycms<3.53) rapidity intervals in the dimuon decay channel and in the mid-rapidity region (−1.37<ycms<0.43) in the dielectron decay channel. The backward and forward rapidity intervals correspond to the Pb-going and p-going direction, respectively. The pT-differential J/ψ production cross section at backward and forward rapidity is measured for several centrality classes, together with the corresponding average pT and p2T values. The nuclear modification factor, QpPb, is presented as a function of centrality for the three rapidity intervals, and, additionally, at backward and forward rapidity, as a function of pT for several centrality classes. At mid- and forward rapidity, the J/ψ yield is suppressed up to 40% compared to that in pp interactions scaled by the number of binary collisions. The degree of suppression increases towards central p-Pb collisions at forward rapidity, and with decreasing pT of the J/ψ. At backward rapidity, the QpPb is compatible with unity within the total uncertainties, with an increasing trend from peripheral to central p-Pb collisions.
We present a measurement of inclusive J/ψ production in p-Pb collisions at sNN−−−√ = 5.02 TeV as a function of the centrality of the collision, as estimated from the energy deposited in the Zero Degree Calorimeters. The measurement is performed with the ALICE detector down to zero transverse momentum, pT, in the backward (−4.46<ycms<−2.96) and forward (2.03<ycms<3.53) rapidity intervals in the dimuon decay channel and in the mid-rapidity region (−1.37<ycms<0.43) in the dielectron decay channel. The backward and forward rapidity intervals correspond to the Pb-going and p-going direction, respectively. The pT-differential J/ψ production cross section at backward and forward rapidity is measured for several centrality classes, together with the corresponding average pT and p2T values. The nuclear modification factor, QpPb, is presented as a function of centrality for the three rapidity intervals, and, additionally, at backward and forward rapidity, as a function of pT for several centrality classes. At mid- and forward rapidity, the J/ψ yield is suppressed up to 40% compared to that in pp interactions scaled by the number of binary collisions. The degree of suppression increases towards central p-Pb collisions at forward rapidity, and with decreasing pT of the J/ψ. At backward rapidity, the QpPb is compatible with unity within the total uncertainties, with an increasing trend from peripheral to central p-Pb collisions.
Im vorliegenden Artikel werden drei kürzlich entdeckte Depotfunde vorgestellt, die einen Einblick in die Ideologie der kriegerischen Häuptlingstümer der Spätbronzezeit in Ungarn geben. Darüber hinaus spezifizieren sie die Identität der führenden Krieger und stellen sie in eine neue Perspektive. Das Schwertdepot von Mezőberény ist ein Beispiel dafür, wie der Akt der Deponierung einem anscheinend unbedeutenden Teil einer Landschaft eine neue Bedeutung verleihen kann. Die Schwertdepots in dem endlosen Weideland spiegeln vermutlich die Bemühungen der Viehzüchter-Clans, die um die natürlichen Resourcen konkurrierten, wider, das von ihnen genutzte Gebiet auch symbolisch in Besitz zu nehmen. Die Zusammensetzung der Hortfunde aus Pázmándfalu zeigt eine enge Verbindung mit Grabbeigaben der Elitekrieger in Mitteleuropa und in den Alpen. Daher ist davon auszugehen, dass diese drei repräsentativen Fundkomplexe im Rahmen einer komplexen Zeremonie niedergelegt wurden, die indirekt mit dem Grabritus in Verbindung steht. Die Zusammensetzung und die Platzierung der Horte erlauben auch eine andere mögliche Interpretation: ein Grabritual in Verbindung mit dem Heroenkult. Das Beispiel der goldenen Beinschiene aus Gyálarét veranschaulicht den Prozess, in dem die Attribute der Krieger in der transzendenten Sphäre Bedeutung erlangen: in der Welt der mythischen Vorfahren, Seelen und Götter. Die Einzigartigkeit der goldenen Beinschiene impliziert, dass dieses Stück den sozialen Status seines Besitzers repräsentierte; zudem könnte es ein mit spirituellen Kräften durchdrungenes Objekt gewesen sein, das eine besondere Behandlung erforderte. Es ist auch möglich, dass die Beinschiene keiner lebenden Person gehörte, sondern stattdessen als Teil einer Kultstatue versteckt worden ist.