First Results on Angular Distributions of Thermal Dileptons in Nuclear Collisions

R Arnaldi; K Banicz; J Castor; B Chaurand; C Cicalo; A Colla; Pietro CORTESE; S Damjanovic; A David; A de Falco; A Devaux; L Ducroux; H En'yo; J Fargeix; A Ferretti; M Floris; A Forster; P Force; N Guettet; A Guichard; H Gulkanian; Heuser JM; M Keil; L Kluberg; 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; Specht HJ; R Tieulent; G Usai; R Veenhof; Wohri HK

doi:10.1103/PhysRevLett.102.222301

First Results on Angular Distributions of Thermal Dileptons in Nuclear Collisions

R Arnaldi, K Banicz, J Castor, B Chaurand, C Cicalo, A Colla, Pietro CORTESE, S Damjanovic, A David, A de Falco, A Devaux, L Ducroux, H En'yo, J Fargeix, A Ferretti, M Floris, A Forster, P Force, N Guettet, A GuichardH Gulkanian, Heuser JM, M Keil, L Kluberg, 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, Specht HJ, R Tieulent, G Usai, R Veenhof, Wohri HK

Dipartimento di Scienze e Innovazione Tecnologica

Risultato della ricerca: Contributo su rivista › Articolo in rivista › peer review

Abstract

The NA60 experiment at the CERN Super Proton Synchrotron 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.

Lingua originale	Inglese
Rivista	Physical Review Letters
Volume	102
Numero di pubblicazione	22
DOI	https://doi.org/10.1103/PhysRevLett.102.222301
Stato di pubblicazione	Pubblicato - 2009

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10.1103/PhysRevLett.102.222301

http://hdl.handle.net/11579/34479

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Arnaldi, R., Banicz, K., Castor, J., Chaurand, B., Cicalo, C., Colla, A., CORTESE, P., Damjanovic, S., David, A., de Falco, A., Devaux, A., Ducroux, L., En'yo, H., Fargeix, J., Ferretti, A., Floris, M., Forster, A., Force, P., Guettet, N., ... HK, W. (2009). First Results on Angular Distributions of Thermal Dileptons in Nuclear Collisions. Physical Review Letters, 102(22). https://doi.org/10.1103/PhysRevLett.102.222301

@article{829e1986b23649e49babb3519c12bc59,

title = "First Results on Angular Distributions of Thermal Dileptons in Nuclear Collisions",

abstract = "The NA60 experiment at the CERN Super Proton Synchrotron 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.",

author = "R Arnaldi and K Banicz and J Castor and B Chaurand and C Cicalo and A Colla and Pietro CORTESE and S Damjanovic and A David and {de Falco}, A and A Devaux and L Ducroux and H En'yo and J Fargeix and A Ferretti and M Floris and A Forster and P Force and N Guettet and A Guichard and H Gulkanian and Heuser JM and M Keil and L Kluberg and C Lourenco and J Lozano and F Manso and P Martins and A Masoni and A Neves and H Ohnishi and C Oppedisano and P Parracho and P Pillot and T Poghosyan and G Puddu and E Radermacher and P Ramalhete and P Rosinsky and E Scomparin and J Seixas and S Serci and R Shahoyan and P Sonderegger and Specht HJ and R Tieulent and G Usai and R Veenhof and Wohri HK",

year = "2009",

doi = "10.1103/PhysRevLett.102.222301",

language = "English",

volume = "102",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "22",

}

Arnaldi, R, Banicz, K, Castor, J, Chaurand, B, Cicalo, C, Colla, A, CORTESE, P, Damjanovic, S, David, A, de Falco, A, Devaux, A, Ducroux, L, En'yo, H, Fargeix, J, Ferretti, A, Floris, M, Forster, A, Force, P, Guettet, N, Guichard, A, Gulkanian, H, JM, H, Keil, M, Kluberg, L, Lourenco, C, Lozano, J, Manso, F, Martins, P, Masoni, A, Neves, A, Ohnishi, H, Oppedisano, C, Parracho, P, Pillot, P, Poghosyan, T, Puddu, G, Radermacher, E, Ramalhete, P, Rosinsky, P, Scomparin, E, Seixas, J, Serci, S, Shahoyan, R, Sonderegger, P, HJ, S, Tieulent, R, Usai, G, Veenhof, R & HK, W 2009, 'First Results on Angular Distributions of Thermal Dileptons in Nuclear Collisions', Physical Review Letters, vol. 102, n. 22. https://doi.org/10.1103/PhysRevLett.102.222301

TY - JOUR

T1 - First Results on Angular Distributions of Thermal Dileptons in Nuclear Collisions

AU - Arnaldi, R

AU - Banicz, K

AU - Castor, J

AU - Chaurand, B

AU - Cicalo, C

AU - Colla, A

AU - CORTESE, Pietro

AU - Damjanovic, S

AU - David, A

AU - de Falco, A

AU - Devaux, A

AU - Ducroux, L

AU - En'yo, H

AU - Fargeix, J

AU - Ferretti, A

AU - Floris, M

AU - Forster, A

AU - Force, P

AU - Guettet, N

AU - Guichard, A

AU - Gulkanian, H

AU - JM, Heuser

AU - Keil, M

AU - Kluberg, L

AU - Lourenco, C

AU - Lozano, J

AU - Manso, F

AU - Martins, P

AU - Masoni, A

AU - Neves, A

AU - Ohnishi, H

AU - Oppedisano, C

AU - Parracho, P

AU - Pillot, P

AU - Poghosyan, T

AU - Puddu, G

AU - Radermacher, E

AU - Ramalhete, P

AU - Rosinsky, P

AU - Scomparin, E

AU - Seixas, J

AU - Serci, S

AU - Shahoyan, R

AU - Sonderegger, P

AU - HJ, Specht

AU - Tieulent, R

AU - Usai, G

AU - Veenhof, R

AU - HK, Wohri

PY - 2009

Y1 - 2009

N2 - The NA60 experiment at the CERN Super Proton Synchrotron 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.

AB - The NA60 experiment at the CERN Super Proton Synchrotron 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.

UR - https://iris.uniupo.it/handle/11579/34479

U2 - 10.1103/PhysRevLett.102.222301

DO - 10.1103/PhysRevLett.102.222301

M3 - Article

SN - 0031-9007

VL - 102

JO - Physical Review Letters

JF - Physical Review Letters

IS - 22

ER -

First Results on Angular Distributions of Thermal Dileptons in Nuclear Collisions

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