Dielectron production in C12+C12 collisions at 2AGeV with the HADES spectrometer

G. Agakichiev; C. Agodi; H. Alvarez-Pol; A. Bałanda; D. Bertini; J. Bielcik; G. Bellia; M. Böhmer; H. Bokemeyer; J. L. Boyard; P. Braun-Munzinger; P. Cabanelas; S. Chernenko; T. Christ; R. Coniglione; L. Cosentino; J. Díaz; F. Dohrmann; I. Durán; T. Eberl; W. Enghardt; L. Fabbietti; O. Fateev; C. Fernandez; P. Finocchiaro; J. Friese; I. Fröhlich; B. Fuentes; C. Garabatos; J. A. Garzón; R. Gernhäuser; C. Gilardi; M. Golubeva; D. González-Díaz; E. Grosse; F. Guber; T. Hennino; S. Hlavac; R. Holzmann; J. Homolka; A. Ierusalimov; I. Iori; A. Ivashkin; M. Jaskuła; M. Jurkovic; M. Kagarlis; M. Kajetanowicz; B. Kämpfer; K. Kanaki; T. Karavicheva; A. Kastenmüller; L. Kidoń; P. Kienle; I. Koenig; W. Koenig; H. J. Körner; B. W. Kolb; R. Kotte; R. Krücken; A. Kugler; W. Kühn; R. Kulessa; A. Kurepin; S. Lang; S. Lange; J. Lehnert; E. Lins; D. Magestro; C. Maiolino; A. Malarz; J. Markert; V. Metag; J. Mousa; M. Münch; C. Müntz; L. Naumann; A. Nekhaev; J. Novotny; J. Otwinowski; Y. C. Pachmayer; V. Pechenov; T. Pérez; P. Piattelli; J. Pietraszko; R. Pleskac; M. Płoskoń; V. Pospísil; W. Prokopowicz; W. Przygoda; B. Ramstein; A. Reshetin; J. Ritman; M. Roy-Stephan; A. Rustamov; A. Sadovsky; B. Sailer; P. Salabura; M. Sánchez; P. Sapienza; A. Schmah; H. Schön; W. Schön; C. Schröder; E. Schwab; R. S. Simon; V. Smolyankin; L. Smykov; S. Spataro; B. Spruck; H. Ströbele; J. Stroth; C. Sturm; M. Sudoł; M. Suk; A. Taranenko; P. Tlusty; A. Toia; M. Traxler; H. Tsertos; D. Vassiliev; A. Vázquez; V. Wagner; W. Waluś; M. Wiśniowski; T. Wójcik; J. Wüstenfeld; Y. Zanevsky; K. Zeitelhack; D. Zovinec; P. Zumbruch

doi:10.1103/PhysRevLett.98.052302

Dielectron production in C12+C12 collisions at 2AGeV with the HADES spectrometer

G. Agakichiev, C. Agodi, H. Alvarez-Pol, A. Bałanda, D. Bertini, J. Bielcik, G. Bellia, M. Böhmer, H. Bokemeyer, J. L. Boyard, P. Braun-Munzinger, P. Cabanelas, S. Chernenko, T. Christ, R. Coniglione, L. Cosentino, J. Díaz, F. Dohrmann, I. Durán, T. EberlW. Enghardt, L. Fabbietti, O. Fateev, C. Fernandez, P. Finocchiaro, J. Friese, I. Fröhlich, B. Fuentes, C. Garabatos, J. A. Garzón, R. Gernhäuser, C. Gilardi, M. Golubeva, D. González-Díaz, E. Grosse, F. Guber, T. Hennino, S. Hlavac, R. Holzmann, J. Homolka, A. Ierusalimov, I. Iori, A. Ivashkin, M. Jaskuła, M. Jurkovic, M. Kagarlis, M. Kajetanowicz, B. Kämpfer, K. Kanaki, T. Karavicheva, A. Kastenmüller, L. Kidoń, P. Kienle, I. Koenig, W. Koenig, H. J. Körner, B. W. Kolb, R. Kotte, R. Krücken, A. Kugler, W. Kühn, R. Kulessa, A. Kurepin, S. Lang, S. Lange, J. Lehnert, E. Lins, D. Magestro, C. Maiolino, A. Malarz, J. Markert, V. Metag, J. Mousa, M. Münch, C. Müntz, L. Naumann, A. Nekhaev, J. Novotny, J. Otwinowski, Y. C. Pachmayer, V. Pechenov, T. Pérez, P. Piattelli, J. Pietraszko, R. Pleskac, M. Płoskoń, V. Pospísil, W. Prokopowicz, W. Przygoda, B. Ramstein, A. Reshetin, J. Ritman, M. Roy-Stephan, A. Rustamov, A. Sadovsky, B. Sailer, P. Salabura, M. Sánchez, P. Sapienza, A. Schmah, H. Schön, W. Schön, C. Schröder, E. Schwab, R. S. Simon, V. Smolyankin, L. Smykov, S. Spataro, B. Spruck, H. Ströbele, J. Stroth, C. Sturm, M. Sudoł, M. Suk, A. Taranenko, P. Tlusty, A. Toia, M. Traxler, H. Tsertos, D. Vassiliev, A. Vázquez, V. Wagner, W. Waluś, M. Wiśniowski, T. Wójcik, J. Wüstenfeld, Y. Zanevsky, K. Zeitelhack, D. Zovinec, P. Zumbruch

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Abstract

The invariant-mass spectrum of e+e- pairs produced in C12+C12 collisions at an incident energy of 2 GeV per nucleon has been measured for the first time. The measured pair production probabilities span over 5 orders of magnitude from the π0-Dalitz to the ρ/ω invariant-mass region. Dalitz decays of π0 and η account for all the yield up to 0.15GeV/c2, but for only about 50% above this mass. A comparison with model calculations shows that the excess pair yield is likely due to baryon-resonance and vector-meson decays. Transport calculations based on vacuum spectral functions fail, however, to describe the entire mass region.

Original language	English
Article number	052302
Journal	Physical Review Letters
Volume	98
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevLett.98.052302
State	Published - 1 Feb 2007

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10.1103/PhysRevLett.98.052302

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Agakichiev, G., Agodi, C., Alvarez-Pol, H., Bałanda, A., Bertini, D., Bielcik, J., Bellia, G., Böhmer, M., Bokemeyer, H., Boyard, J. L., Braun-Munzinger, P., Cabanelas, P., Chernenko, S., Christ, T., Coniglione, R., Cosentino, L., Díaz, J., Dohrmann, F., Durán, I., ... Zumbruch, P. (2007). Dielectron production in C12+C12 collisions at 2AGeV with the HADES spectrometer. Physical Review Letters, 98(5), Article 052302. https://doi.org/10.1103/PhysRevLett.98.052302

@article{1e7d6303de1c4c23a6b05746ff425571,

title = "Dielectron production in C12+C12 collisions at 2AGeV with the HADES spectrometer",

abstract = "The invariant-mass spectrum of e+e- pairs produced in C12+C12 collisions at an incident energy of 2 GeV per nucleon has been measured for the first time. The measured pair production probabilities span over 5 orders of magnitude from the π0-Dalitz to the ρ/ω invariant-mass region. Dalitz decays of π0 and η account for all the yield up to 0.15GeV/c2, but for only about 50% above this mass. A comparison with model calculations shows that the excess pair yield is likely due to baryon-resonance and vector-meson decays. Transport calculations based on vacuum spectral functions fail, however, to describe the entire mass region.",

author = "G. Agakichiev and C. Agodi and H. Alvarez-Pol and A. Ba{\l}anda and D. Bertini and J. Bielcik and G. Bellia and M. B{\"o}hmer and H. Bokemeyer and Boyard, {J. L.} and P. Braun-Munzinger and P. Cabanelas and S. Chernenko and T. Christ and R. Coniglione and L. Cosentino and J. D{\'i}az and F. Dohrmann and I. Dur{\'a}n and T. Eberl and W. Enghardt and L. Fabbietti and O. Fateev and C. Fernandez and P. Finocchiaro and J. Friese and I. Fr{\"o}hlich and B. Fuentes and C. Garabatos and Garz{\'o}n, {J. A.} and R. Gernh{\"a}user and C. Gilardi and M. Golubeva and D. Gonz{\'a}lez-D{\'i}az and E. Grosse and F. Guber and T. Hennino and S. Hlavac and R. Holzmann and J. Homolka and A. Ierusalimov and I. Iori and A. Ivashkin and M. Jasku{\l}a and M. Jurkovic and M. Kagarlis and M. Kajetanowicz and B. K{\"a}mpfer and K. Kanaki and T. Karavicheva and A. Kastenm{\"u}ller and L. Kido{\'n} and P. Kienle and I. Koenig and W. Koenig and K{\"o}rner, {H. J.} and Kolb, {B. W.} and R. Kotte and R. Kr{\"u}cken and A. Kugler and W. K{\"u}hn and R. Kulessa and A. Kurepin and S. Lang and S. Lange and J. Lehnert and E. Lins and D. Magestro and C. Maiolino and A. Malarz and J. Markert and V. Metag and J. Mousa and M. M{\"u}nch and C. M{\"u}ntz and L. Naumann and A. Nekhaev and J. Novotny and J. Otwinowski and Pachmayer, {Y. C.} and V. Pechenov and T. P{\'e}rez and P. Piattelli and J. Pietraszko and R. Pleskac and M. P{\l}osko{\'n} and V. Posp{\'i}sil and W. Prokopowicz and W. Przygoda and B. Ramstein and A. Reshetin and J. Ritman and M. Roy-Stephan and A. Rustamov and A. Sadovsky and B. Sailer and P. Salabura and M. S{\'a}nchez and P. Sapienza and A. Schmah and H. Sch{\"o}n and W. Sch{\"o}n and C. Schr{\"o}der and E. Schwab and Simon, {R. S.} and V. Smolyankin and L. Smykov and S. Spataro and B. Spruck and H. Str{\"o}bele and J. Stroth and C. Sturm and M. Sudo{\l} and M. Suk and A. Taranenko and P. Tlusty and A. Toia and M. Traxler and H. Tsertos and D. Vassiliev and A. V{\'a}zquez and V. Wagner and W. Walu{\'s} and M. Wi{\'s}niowski and T. W{\'o}jcik and J. W{\"u}stenfeld and Y. Zanevsky and K. Zeitelhack and D. Zovinec and P. Zumbruch",

year = "2007",

month = feb,

day = "1",

doi = "10.1103/PhysRevLett.98.052302",

language = "English",

volume = "98",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "5",

}

Agakichiev, G, Agodi, C, Alvarez-Pol, H, Bałanda, A, Bertini, D, Bielcik, J, Bellia, G, Böhmer, M, Bokemeyer, H, Boyard, JL, Braun-Munzinger, P, Cabanelas, P, Chernenko, S, Christ, T, Coniglione, R, Cosentino, L, Díaz, J, Dohrmann, F, Durán, I, Eberl, T, Enghardt, W, Fabbietti, L, Fateev, O, Fernandez, C, Finocchiaro, P, Friese, J, Fröhlich, I, Fuentes, B, Garabatos, C, Garzón, JA, Gernhäuser, R, Gilardi, C, Golubeva, M, González-Díaz, D, Grosse, E, Guber, F, Hennino, T, Hlavac, S, Holzmann, R, Homolka, J, Ierusalimov, A, Iori, I, Ivashkin, A, Jaskuła, M, Jurkovic, M, Kagarlis, M, Kajetanowicz, M, Kämpfer, B, Kanaki, K, Karavicheva, T, Kastenmüller, A, Kidoń, L, Kienle, P, Koenig, I, Koenig, W, Körner, HJ, Kolb, BW, Kotte, R, Krücken, R, Kugler, A, Kühn, W, Kulessa, R, Kurepin, A, Lang, S, Lange, S, Lehnert, J, Lins, E, Magestro, D, Maiolino, C, Malarz, A, Markert, J, Metag, V, Mousa, J, Münch, M, Müntz, C, Naumann, L, Nekhaev, A, Novotny, J, Otwinowski, J, Pachmayer, YC, Pechenov, V, Pérez, T, Piattelli, P, Pietraszko, J, Pleskac, R, Płoskoń, M, Pospísil, V, Prokopowicz, W, Przygoda, W, Ramstein, B, Reshetin, A, Ritman, J, Roy-Stephan, M, Rustamov, A, Sadovsky, A, Sailer, B, Salabura, P, Sánchez, M, Sapienza, P, Schmah, A, Schön, H, Schön, W, Schröder, C, Schwab, E, Simon, RS, Smolyankin, V, Smykov, L, Spataro, S, Spruck, B, Ströbele, H, Stroth, J, Sturm, C, Sudoł, M, Suk, M, Taranenko, A, Tlusty, P, Toia, A, Traxler, M, Tsertos, H, Vassiliev, D, Vázquez, A, Wagner, V, Waluś, W, Wiśniowski, M, Wójcik, T, Wüstenfeld, J, Zanevsky, Y, Zeitelhack, K, Zovinec, D & Zumbruch, P 2007, 'Dielectron production in C12+C12 collisions at 2AGeV with the HADES spectrometer', Physical Review Letters, vol. 98, no. 5, 052302. https://doi.org/10.1103/PhysRevLett.98.052302

TY - JOUR

T1 - Dielectron production in C12+C12 collisions at 2AGeV with the HADES spectrometer

AU - Agakichiev, G.

AU - Agodi, C.

AU - Alvarez-Pol, H.

AU - Bałanda, A.

AU - Bertini, D.

AU - Bielcik, J.

AU - Bellia, G.

AU - Böhmer, M.

AU - Bokemeyer, H.

AU - Boyard, J. L.

AU - Braun-Munzinger, P.

AU - Cabanelas, P.

AU - Chernenko, S.

AU - Christ, T.

AU - Coniglione, R.

AU - Cosentino, L.

AU - Díaz, J.

AU - Dohrmann, F.

AU - Durán, I.

AU - Eberl, T.

AU - Enghardt, W.

AU - Fabbietti, L.

AU - Fateev, O.

AU - Fernandez, C.

AU - Finocchiaro, P.

AU - Friese, J.

AU - Fröhlich, I.

AU - Fuentes, B.

AU - Garabatos, C.

AU - Garzón, J. A.

AU - Gernhäuser, R.

AU - Gilardi, C.

AU - Golubeva, M.

AU - González-Díaz, D.

AU - Grosse, E.

AU - Guber, F.

AU - Hennino, T.

AU - Hlavac, S.

AU - Holzmann, R.

AU - Homolka, J.

AU - Ierusalimov, A.

AU - Iori, I.

AU - Ivashkin, A.

AU - Jaskuła, M.

AU - Jurkovic, M.

AU - Kagarlis, M.

AU - Kajetanowicz, M.

AU - Kämpfer, B.

AU - Kanaki, K.

AU - Karavicheva, T.

AU - Kastenmüller, A.

AU - Kidoń, L.

AU - Kienle, P.

AU - Koenig, I.

AU - Koenig, W.

AU - Körner, H. J.

AU - Kolb, B. W.

AU - Kotte, R.

AU - Krücken, R.

AU - Kugler, A.

AU - Kühn, W.

AU - Kulessa, R.

AU - Kurepin, A.

AU - Lang, S.

AU - Lange, S.

AU - Lehnert, J.

AU - Lins, E.

AU - Magestro, D.

AU - Maiolino, C.

AU - Malarz, A.

AU - Markert, J.

AU - Metag, V.

AU - Mousa, J.

AU - Münch, M.

AU - Müntz, C.

AU - Naumann, L.

AU - Nekhaev, A.

AU - Novotny, J.

AU - Otwinowski, J.

AU - Pachmayer, Y. C.

AU - Pechenov, V.

AU - Pérez, T.

AU - Piattelli, P.

AU - Pietraszko, J.

AU - Pleskac, R.

AU - Płoskoń, M.

AU - Pospísil, V.

AU - Prokopowicz, W.

AU - Przygoda, W.

AU - Ramstein, B.

AU - Reshetin, A.

AU - Ritman, J.

AU - Roy-Stephan, M.

AU - Rustamov, A.

AU - Sadovsky, A.

AU - Sailer, B.

AU - Salabura, P.

AU - Sánchez, M.

AU - Sapienza, P.

AU - Schmah, A.

AU - Schön, H.

AU - Schön, W.

AU - Schröder, C.

AU - Schwab, E.

AU - Simon, R. S.

AU - Smolyankin, V.

AU - Smykov, L.

AU - Spataro, S.

AU - Spruck, B.

AU - Ströbele, H.

AU - Stroth, J.

AU - Sturm, C.

AU - Sudoł, M.

AU - Suk, M.

AU - Taranenko, A.

AU - Tlusty, P.

AU - Toia, A.

AU - Traxler, M.

AU - Tsertos, H.

AU - Vassiliev, D.

AU - Vázquez, A.

AU - Wagner, V.

AU - Waluś, W.

AU - Wiśniowski, M.

AU - Wójcik, T.

AU - Wüstenfeld, J.

AU - Zanevsky, Y.

AU - Zeitelhack, K.

AU - Zovinec, D.

AU - Zumbruch, P.

PY - 2007/2/1

Y1 - 2007/2/1

N2 - The invariant-mass spectrum of e+e- pairs produced in C12+C12 collisions at an incident energy of 2 GeV per nucleon has been measured for the first time. The measured pair production probabilities span over 5 orders of magnitude from the π0-Dalitz to the ρ/ω invariant-mass region. Dalitz decays of π0 and η account for all the yield up to 0.15GeV/c2, but for only about 50% above this mass. A comparison with model calculations shows that the excess pair yield is likely due to baryon-resonance and vector-meson decays. Transport calculations based on vacuum spectral functions fail, however, to describe the entire mass region.

AB - The invariant-mass spectrum of e+e- pairs produced in C12+C12 collisions at an incident energy of 2 GeV per nucleon has been measured for the first time. The measured pair production probabilities span over 5 orders of magnitude from the π0-Dalitz to the ρ/ω invariant-mass region. Dalitz decays of π0 and η account for all the yield up to 0.15GeV/c2, but for only about 50% above this mass. A comparison with model calculations shows that the excess pair yield is likely due to baryon-resonance and vector-meson decays. Transport calculations based on vacuum spectral functions fail, however, to describe the entire mass region.

UR - http://www.scopus.com/inward/record.url?scp=33846781124&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.98.052302

DO - 10.1103/PhysRevLett.98.052302

M3 - Article

AN - SCOPUS:33846781124

SN - 0031-9007

VL - 98

JO - Physical Review Letters

JF - Physical Review Letters

IS - 5

M1 - 052302

ER -

Dielectron production in C12+C12 collisions at 2AGeV with the HADES spectrometer

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