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First results on angular distributions of thermal dileptons in nuclear collisions

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arxiv 0812.3100 v1 pith:J4MSIIW6 submitted 2008-12-16 nucl-ex

First results on angular distributions of thermal dileptons in nuclear collisions

NA60 Collaboration: R. Arnaldi , K. Banicz , K. Borer , J. Castor , B. Chaurand , W. Chen , C. Cicalo , A. Colla
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P. Cortese S. Damjanovic A. David A. de Falco A. Devaux L. Ducroux H. En'yo J. Fargeix A. Ferretti M. Floris A. Foerster P. Force N. Guettet A. Guichard H. Gulkanian J. M. Heuser M. Keil L. Kluberg Z. Li C. Lourenco J. Lozano F. Manso P. Martins A. Masoni A. Neves H. Ohnishi C. Oppedisano P. Parracho P. Pillot T. Poghosyan G. Puddu E. Radermacher P. Ramalhete P. Rosinsky E. Scomparin J. Seixas S. Serci R. Shahoyan P. Sonderegger H. J. Specht R. Tieulent G. Usai R. Veenhof H. K. Woehri
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The NA60 experiment at the CERN SPS has studied dimuon production in 158A GeV In-In collisions. The strong excess of pairs above the known sources found in the complete mass region 0.2<M<2.6 GeV has previously been interpreted as thermal radiation. We now present first results on the associated angular distributions. Using the Collins-Soper reference frame, the structure function parameters \lambda, \mu and \nu are measured to be zero, and the projected distributions in polar and azimuth angles are found to be uniform. The absence of any polarization is consistent with the interpretation of the excess dimuons as thermal radiation from a randomized system.

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  1. The polarization of thermal dileptons emitted in high-energy heavy-ion collisions

    nucl-th 2026-05 unverdicted novelty 5.0

    Thermal dilepton polarization in LHC heavy-ion collisions is sensitive to QGP in-medium properties, with a one-to-one mapping derived between dielectron and dimuon channels.