First measurement of proton-induced low-momentum dielectron radiation off cold nuclear matter

G. Agakishiev; A. Balanda; D. Belver; A. Belyaev; J. C. Berger-Chen; A. Blanco; M. Böhmer; J. L. Boyard; P. Cabanelas; S. Chernenko; A. Dybczak; E. Epple; L. Fabbietti; O. Fateev; P. Finocchiaro; P. Fonte; J. Friese; I. Fröhlich; T. Galatyuk; J. A. Garzón; R. Gernhäuser; K. Göbel; M. Golubeva; D. González-Díaz; F. Guber; M. Gumberidze; T. Heinz; T. Hennino; R. Holzmann; A. Ierusalimov; I. Iori; A. Ivashkin; M. Jurkovic; B. Kämpfer; T. Karavicheva; I. Koenig; W. Koenig; B. W. Kolb; G. Kornakov; R. Kotte; A. Krása; F. Krizek; R. Krücken; H. Kuc; W. Kühn; A. Kugler; A. Kurepin; V. Ladygin; R. Lalik; S. Lang; K. Lapidus; A. Lebedev; T. Liu; L. Lopes; M. Lorenz; L. Maier; A. Mangiarotti; J. Markert; V. Metag; B. Michalska; J. Michel; D. Mishra; C. Müntz; L. Naumann; Y. C. Pachmayer; M. Palka; Y. Parpottas; V. Pechenov; O. Pechenova; J. Pietraszko; W. Przygoda; B. Ramstein; A. Reshetin; A. Rustamov; A. Sadovsky; P. Salabura; A. Schmah; E. Schwab; J. Siebenson; Yu G. Sobolev; S. Spataro; B. Spruck; H. Ströbele; J. Stroth; C. Sturm; A. Tarantola; K. Teilab; P. Tlusty; M. Traxler; R. Trebacz; H. Tsertos; T. Vasiliev; V. Wagner; M. Weber; C. Wendisch; J. Wüstenfeld; S. Yurevich; Y. Zanevsky

doi:10.1016/j.physletb.2012.08.004

First measurement of proton-induced low-momentum dielectron radiation off cold nuclear matter

G. Agakishiev
, A. Balanda
, D. Belver
, A. Belyaev
, J. C. Berger-Chen
, A. Blanco
, M. Böhmer
, J. L. Boyard
, P. Cabanelas
, S. Chernenko
, A. Dybczak
, E. Epple
, L. Fabbietti
, O. Fateev
, P. Finocchiaro
, P. Fonte
, J. Friese
, I. Fröhlich
, T. Galatyuk
, J. A. Garzón

R. Gernhäuser, K. Göbel, M. Golubeva, D. González-Díaz, F. Guber, M. Gumberidze, T. Heinz, T. Hennino, R. Holzmann, A. Ierusalimov, I. Iori, A. Ivashkin, M. Jurkovic, B. Kämpfer, T. Karavicheva, I. Koenig, W. Koenig, B. W. Kolb, G. Kornakov, R. Kotte, A. Krása, F. Krizek, R. Krücken, H. Kuc, W. Kühn, A. Kugler, A. Kurepin, V. Ladygin, R. Lalik, S. Lang, K. Lapidus, A. Lebedev, T. Liu, L. Lopes, M. Lorenz, L. Maier, A. Mangiarotti, J. Markert, V. Metag, B. Michalska, J. Michel, D. Mishra, C. Müntz, L. Naumann, Y. C. Pachmayer, M. Palka, Y. Parpottas, V. Pechenov, O. Pechenova, J. Pietraszko, W. Przygoda, B. Ramstein, A. Reshetin, A. Rustamov, A. Sadovsky, P. Salabura, A. Schmah, E. Schwab, J. Siebenson, Yu G. Sobolev, S. Spataro, B. Spruck, H. Ströbele, J. Stroth, C. Sturm, A. Tarantola, K. Teilab, P. Tlusty, M. Traxler, R. Trebacz, H. Tsertos, T. Vasiliev, V. Wagner, M. Weber, C. Wendisch, J. Wüstenfeld, S. Yurevich, Y. Zanevsky

Joint Inst. for Nuclear Research
Jagiellonian University
Universidad de Santiago de Compostela
Cluster of Excellence E-conversion
LIP - Lisboa
Technical University of Munich
CNRS/IN2P3 and Université Paris 11
Laboratori Nazionali Del Sud
Coimbra Polytechnic - ISEC
Johann Wolfgang Goethe University
GSI Helmholtz Center
Institute for Nuclear Research of the Russian Academy of Sciences
Technische Universität Darmstadt
INFN Sezione di Milano
University of Milan
HelmholtzZentrum Dresden-Rossendorf
Technische Universität Dresden
Nuclear Physics Institute of the Cas
Justus-Liebig-Universität Gießen
ITEP
Frederick University
University of Cyprus
Lawrence Berkeley National Laboratory
University of Torino
University of Houston

Research output: Contribution to journal › Article › peer-review

55 Scopus citations

Abstract

We present data on dielectron emission in proton induced reactions on a Nb target at 3.5 GeV kinetic beam energy measured with HADES installed at GSI. The data represent the first high statistics measurement of proton-induced dielectron radiation from cold nuclear matter in a kinematic regime, where strong medium effects are expected. Combined with the good mass resolution of 2%, it is the first measurement sensitive to changes of the spectral functions of vector mesons, as predicted by models for hadrons at rest or small relative momenta. Comparing the e ⁺e ^- invariant mass spectra to elementary p+p data, we observe for e ⁺e ^- momenta P _ee<0.8 GeV/c a strong modification of the shape of the spectrum, which we attribute to an additional ρ-like contribution and a decrease of ω yield. These opposite trends are tentatively interpreted as a strong coupling of the ρ meson to baryonic resonances and an absorption of the ω meson, which are two aspects of in-medium modification of vector mesons.

Original language	English
Pages (from-to)	304-309
Number of pages	6
Journal	Physics Letters B
Volume	715
Issue number	4-5
DOIs	https://doi.org/10.1016/j.physletb.2012.08.004
State	Published - 10 Sep 2012
Externally published	Yes

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10.1016/j.physletb.2012.08.004

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Agakishiev, G., Balanda, A., Belver, D., Belyaev, A., Berger-Chen, J. C., Blanco, A., Böhmer, M., Boyard, J. L., Cabanelas, P., Chernenko, S., Dybczak, A., Epple, E., Fabbietti, L., Fateev, O., Finocchiaro, P., Fonte, P., Friese, J., Fröhlich, I., Galatyuk, T., ... Zanevsky, Y. (2012). First measurement of proton-induced low-momentum dielectron radiation off cold nuclear matter. Physics Letters B, 715(4-5), 304-309. https://doi.org/10.1016/j.physletb.2012.08.004

@article{2833d0b0de5947758f7bc821437560f6,

title = "First measurement of proton-induced low-momentum dielectron radiation off cold nuclear matter",

abstract = "We present data on dielectron emission in proton induced reactions on a Nb target at 3.5 GeV kinetic beam energy measured with HADES installed at GSI. The data represent the first high statistics measurement of proton-induced dielectron radiation from cold nuclear matter in a kinematic regime, where strong medium effects are expected. Combined with the good mass resolution of 2\%, it is the first measurement sensitive to changes of the spectral functions of vector mesons, as predicted by models for hadrons at rest or small relative momenta. Comparing the e +e - invariant mass spectra to elementary p+p data, we observe for e +e - momenta P ee<0.8 GeV/c a strong modification of the shape of the spectrum, which we attribute to an additional ρ-like contribution and a decrease of ω yield. These opposite trends are tentatively interpreted as a strong coupling of the ρ meson to baryonic resonances and an absorption of the ω meson, which are two aspects of in-medium modification of vector mesons.",

author = "G. Agakishiev and A. Balanda and D. Belver and A. Belyaev and Berger-Chen, \{J. C.\} and A. Blanco and M. B{\"o}hmer and Boyard, \{J. L.\} and P. Cabanelas and S. Chernenko and A. Dybczak and E. Epple and L. Fabbietti and O. Fateev and P. Finocchiaro and P. Fonte and J. Friese and I. Fr{\"o}hlich and T. Galatyuk and Garz{\'o}n, \{J. A.\} and R. Gernh{\"a}user and K. G{\"o}bel and M. Golubeva and D. Gonz{\'a}lez-D{\'i}az and F. Guber and M. Gumberidze and T. Heinz and T. Hennino and R. Holzmann and A. Ierusalimov and I. Iori and A. Ivashkin and M. Jurkovic and B. K{\"a}mpfer and T. Karavicheva and I. Koenig and W. Koenig and Kolb, \{B. W.\} and G. Kornakov and R. Kotte and A. Kr{\'a}sa and F. Krizek and R. Kr{\"u}cken and H. Kuc and W. K{\"u}hn and A. Kugler and A. Kurepin and V. Ladygin and R. Lalik and S. Lang and K. Lapidus and A. Lebedev and T. Liu and L. Lopes and M. Lorenz and L. Maier and A. Mangiarotti and J. Markert and V. Metag and B. Michalska and J. Michel and D. Mishra and C. M{\"u}ntz and L. Naumann and Pachmayer, \{Y. C.\} and M. Palka and Y. Parpottas and V. Pechenov and O. Pechenova and J. Pietraszko and W. Przygoda and B. Ramstein and A. Reshetin and A. Rustamov and A. Sadovsky and P. Salabura and A. Schmah and E. Schwab and J. Siebenson and Sobolev, \{Yu G.\} and S. Spataro and B. Spruck and H. Str{\"o}bele and J. Stroth and C. Sturm and A. Tarantola and K. Teilab and P. Tlusty and M. Traxler and R. Trebacz and H. Tsertos and T. Vasiliev and V. Wagner and M. Weber and C. Wendisch and J. W{\"u}stenfeld and S. Yurevich and Y. Zanevsky",

note = "Funding Information: We thank our colleagues from theory, in particular Janus Weil for many fruitful discussions. The collaboration gratefully acknowledges the support by CNRS/IN2P3 and IPN Orsay (France) , LIP Coimbra, Coimbra (Portugal) : PTDC/FIS/113339/2009 , SIP JUC Cracow, Cracow (Poland) : N N202 286038 28-NN202198639 , Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Dresden (Germany) : BMBF 06DR9059D , TU Munchen, Garching (Germany) MLLMuenchenDFG EClust : 153VHNG-330 , BMBF 06MT9156 TP5 TP6, GSI TMKrue 1012, NPI AS CR, GSI TMFABI 1012, Rez (Czech Republic) : MSMT LC07050 , GAASCR IAA100480803 , USC-S. de Compostela, Santiago de Compostela (Spain) : CPAN:CSD2007-00042 , Helmholtz Alliance HA216/EMMI .",

year = "2012",

month = sep,

day = "10",

doi = "10.1016/j.physletb.2012.08.004",

language = "English",

volume = "715",

pages = "304--309",

journal = "Physics Letters B",

issn = "0370-2693",

publisher = "Elsevier B.V.",

number = "4-5",

}

Agakishiev, G, Balanda, A, Belver, D, Belyaev, A, Berger-Chen, JC, Blanco, A, Böhmer, M, Boyard, JL, Cabanelas, P, Chernenko, S, Dybczak, A, Epple, E, Fabbietti, L, Fateev, O, Finocchiaro, P, Fonte, P, Friese, J, Fröhlich, I, Galatyuk, T, Garzón, JA, Gernhäuser, R, Göbel, K, Golubeva, M, González-Díaz, D, Guber, F, Gumberidze, M, Heinz, T, Hennino, T, Holzmann, R, Ierusalimov, A, Iori, I, Ivashkin, A, Jurkovic, M, Kämpfer, B, Karavicheva, T, Koenig, I, Koenig, W, Kolb, BW, Kornakov, G, Kotte, R, Krása, A, Krizek, F, Krücken, R, Kuc, H, Kühn, W, Kugler, A, Kurepin, A, Ladygin, V, Lalik, R, Lang, S, Lapidus, K, Lebedev, A, Liu, T, Lopes, L, Lorenz, M, Maier, L, Mangiarotti, A, Markert, J, Metag, V, Michalska, B, Michel, J, Mishra, D, Müntz, C, Naumann, L, Pachmayer, YC, Palka, M, Parpottas, Y, Pechenov, V, Pechenova, O, Pietraszko, J, Przygoda, W, Ramstein, B, Reshetin, A, Rustamov, A, Sadovsky, A, Salabura, P, Schmah, A, Schwab, E, Siebenson, J, Sobolev, YG, Spataro, S, Spruck, B, Ströbele, H, Stroth, J, Sturm, C, Tarantola, A, Teilab, K, Tlusty, P, Traxler, M, Trebacz, R, Tsertos, H, Vasiliev, T, Wagner, V, Weber, M, Wendisch, C, Wüstenfeld, J, Yurevich, S & Zanevsky, Y 2012, 'First measurement of proton-induced low-momentum dielectron radiation off cold nuclear matter', Physics Letters B, vol. 715, no. 4-5, pp. 304-309. https://doi.org/10.1016/j.physletb.2012.08.004

TY - JOUR

T1 - First measurement of proton-induced low-momentum dielectron radiation off cold nuclear matter

AU - Agakishiev, G.

AU - Balanda, A.

AU - Belver, D.

AU - Belyaev, A.

AU - Berger-Chen, J. C.

AU - Blanco, A.

AU - Böhmer, M.

AU - Boyard, J. L.

AU - Cabanelas, P.

AU - Chernenko, S.

AU - Dybczak, A.

AU - Epple, E.

AU - Fabbietti, L.

AU - Fateev, O.

AU - Finocchiaro, P.

AU - Fonte, P.

AU - Friese, J.

AU - Fröhlich, I.

AU - Galatyuk, T.

AU - Garzón, J. A.

AU - Gernhäuser, R.

AU - Göbel, K.

AU - Golubeva, M.

AU - González-Díaz, D.

AU - Guber, F.

AU - Gumberidze, M.

AU - Heinz, T.

AU - Hennino, T.

AU - Holzmann, R.

AU - Ierusalimov, A.

AU - Iori, I.

AU - Ivashkin, A.

AU - Jurkovic, M.

AU - Kämpfer, B.

AU - Karavicheva, T.

AU - Koenig, I.

AU - Koenig, W.

AU - Kolb, B. W.

AU - Kornakov, G.

AU - Kotte, R.

AU - Krása, A.

AU - Krizek, F.

AU - Krücken, R.

AU - Kuc, H.

AU - Kühn, W.

AU - Kugler, A.

AU - Kurepin, A.

AU - Ladygin, V.

AU - Lalik, R.

AU - Lang, S.

AU - Lapidus, K.

AU - Lebedev, A.

AU - Liu, T.

AU - Lopes, L.

AU - Lorenz, M.

AU - Maier, L.

AU - Mangiarotti, A.

AU - Markert, J.

AU - Metag, V.

AU - Michalska, B.

AU - Michel, J.

AU - Mishra, D.

AU - Müntz, C.

AU - Naumann, L.

AU - Pachmayer, Y. C.

AU - Palka, M.

AU - Parpottas, Y.

AU - Pechenov, V.

AU - Pechenova, O.

AU - Pietraszko, J.

AU - Przygoda, W.

AU - Ramstein, B.

AU - Reshetin, A.

AU - Rustamov, A.

AU - Sadovsky, A.

AU - Salabura, P.

AU - Schmah, A.

AU - Schwab, E.

AU - Siebenson, J.

AU - Sobolev, Yu G.

AU - Spataro, S.

AU - Spruck, B.

AU - Ströbele, H.

AU - Stroth, J.

AU - Sturm, C.

AU - Tarantola, A.

AU - Teilab, K.

AU - Tlusty, P.

AU - Traxler, M.

AU - Trebacz, R.

AU - Tsertos, H.

AU - Vasiliev, T.

AU - Wagner, V.

AU - Weber, M.

AU - Wendisch, C.

AU - Wüstenfeld, J.

AU - Yurevich, S.

AU - Zanevsky, Y.

N1 - Funding Information: We thank our colleagues from theory, in particular Janus Weil for many fruitful discussions. The collaboration gratefully acknowledges the support by CNRS/IN2P3 and IPN Orsay (France) , LIP Coimbra, Coimbra (Portugal) : PTDC/FIS/113339/2009 , SIP JUC Cracow, Cracow (Poland) : N N202 286038 28-NN202198639 , Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Dresden (Germany) : BMBF 06DR9059D , TU Munchen, Garching (Germany) MLLMuenchenDFG EClust : 153VHNG-330 , BMBF 06MT9156 TP5 TP6, GSI TMKrue 1012, NPI AS CR, GSI TMFABI 1012, Rez (Czech Republic) : MSMT LC07050 , GAASCR IAA100480803 , USC-S. de Compostela, Santiago de Compostela (Spain) : CPAN:CSD2007-00042 , Helmholtz Alliance HA216/EMMI .

PY - 2012/9/10

Y1 - 2012/9/10

N2 - We present data on dielectron emission in proton induced reactions on a Nb target at 3.5 GeV kinetic beam energy measured with HADES installed at GSI. The data represent the first high statistics measurement of proton-induced dielectron radiation from cold nuclear matter in a kinematic regime, where strong medium effects are expected. Combined with the good mass resolution of 2%, it is the first measurement sensitive to changes of the spectral functions of vector mesons, as predicted by models for hadrons at rest or small relative momenta. Comparing the e +e - invariant mass spectra to elementary p+p data, we observe for e +e - momenta P ee<0.8 GeV/c a strong modification of the shape of the spectrum, which we attribute to an additional ρ-like contribution and a decrease of ω yield. These opposite trends are tentatively interpreted as a strong coupling of the ρ meson to baryonic resonances and an absorption of the ω meson, which are two aspects of in-medium modification of vector mesons.

AB - We present data on dielectron emission in proton induced reactions on a Nb target at 3.5 GeV kinetic beam energy measured with HADES installed at GSI. The data represent the first high statistics measurement of proton-induced dielectron radiation from cold nuclear matter in a kinematic regime, where strong medium effects are expected. Combined with the good mass resolution of 2%, it is the first measurement sensitive to changes of the spectral functions of vector mesons, as predicted by models for hadrons at rest or small relative momenta. Comparing the e +e - invariant mass spectra to elementary p+p data, we observe for e +e - momenta P ee<0.8 GeV/c a strong modification of the shape of the spectrum, which we attribute to an additional ρ-like contribution and a decrease of ω yield. These opposite trends are tentatively interpreted as a strong coupling of the ρ meson to baryonic resonances and an absorption of the ω meson, which are two aspects of in-medium modification of vector mesons.

UR - https://www.scopus.com/pages/publications/84865387035

U2 - 10.1016/j.physletb.2012.08.004

DO - 10.1016/j.physletb.2012.08.004

M3 - Article

AN - SCOPUS:84865387035

SN - 0370-2693

VL - 715

SP - 304

EP - 309

JO - Physics Letters B

JF - Physics Letters B

IS - 4-5

ER -

First measurement of proton-induced low-momentum dielectron radiation off cold nuclear matter

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