Analysis of the exclusive final state npe+e- in the quasi-free np reaction

被引：12

作者：

Adamczewski-Musch, J. ^{[4
]}

Arnold, O. ^{[9
,10
]}

Atomssa, E. T. ^{[15
]}

Behnke, C. ^{[8
]}

Belounnas, A. ^{[15
]}

Belyaev, A. ^{[7
]}

Berger-Chen, J. C. ^{[9
,10
]}

Biernat, J. ^{[3
]}

Blanco, A. ^{[2
]}

Blume, C. ^{[8
]}

Boehmer, M. ^{[10
]}

Bordalo, P. ^{[2
]}

Chernenko, S. ^{[7
]}

Chlad, L. ^{[16
]}

Deveaux, C. ^{[11
]}

Dreyer, J. ^{[6
]}

Dybczak, A. ^{[3
]}

Epple, E. ^{[9
,10
]}

Fabbietti, L. ^{[9
,10
]}

Fateev, O. ^{[7
]}

Filip, P. ^{[1
]}

Fonte, P. ^{[2
,19
]}

Franco, C. ^{[2
]}

Friese, J. ^{[10
]}

Froehlich, I. ^{[8
]}

Galatyuk, T. ^{[4
,5
]}

Garzon, J. A. ^{[17
]}

Gernhaeuser, R. ^{[10
]}

Golubeva, M. ^{[12
]}

Guber, F. ^{[12
]}

Gumberidze, M. ^{[5
,20
]}

Harabasz, S. ^{[3
,5
]}

Heinz, T. ^{[4
]}

Hennino, T. ^{[15
]}

Hlavac, S. ^{[1
]}

Höhne, C. ^{[11
]}

Holzmann, R. ^{[4
]}

Ierusalimov, A. ^{[7
]}

Ivashkin, A. ^{[12
]}

Kaempfer, B. ^{[6
,21
]}

Karavicheva, T. ^{[12
]}

Kardan, B. ^{[8
]}

Koenig, I. ^{[4
]}

Koenig, W. ^{[4
]}

Kolb, B. W. ^{[4
]}

Korcyl, G. ^{[3
]}

Kornakov, G. ^{[5
]}

Kotte, R. ^{[6
]}

Kuehn, W. ^{[11
]}

Kugler, A. ^{[16
]}

机构：

[1] Slovak Acad Sci, Inst Phys, Bratislava 84228, Slovakia

[2] LIP Lab Instrumentacao & Fis Expt Particulas, P-3004516 Coimbra, Portugal

[3] Jagiellonian Univ Cracow, Smoluchowski Inst Phys, PL-30059 Krakow, Poland

[4] GSI Helmholtzzentrum Schwerionenforsch GmbH, D-64291 Darmstadt, Germany

[5] Tech Univ Darmstadt, D-64289 Darmstadt, Germany

[6] Helmholtz Zentrum Dresden Rossendorf, Inst Strahlenphys, D-01314 Dresden, Germany

[7] Joint Inst Nucl Res, Dubna 141980, Russia

[8] Goethe Univ, Inst Kernphys, D-60438 Frankfurt, Germany

[9] Excellence Cluster Origin & Struct Universe, D-85748 Garching, Germany

[10] Tech Univ Munich, Phys Dept E62, D-85748 Garching, Germany

[11] Justus Liebig Univ Giessen, Phys Inst 2, D-35392 Giessen, Germany

[12] Russian Acad Sci, Inst Nucl Res, Moscow 117312, Russia

[13] Inst Theoret & Expt Phys, Moscow 117218, Russia

[14] Univ Cyprus, Dept Phys, CY-1678 Nicosia, Cyprus

[15] Univ Paris Saclay, Univ Paris Sud, Inst Phys Nucl, CNRS,IN2P3, F-91406 Orsay, France

[16] Czech Acad Sci, Nucl Phys Inst, Rez 25068, Czech Republic

[17] Univ Santiago de Compostela, LabCAF F Fis, Santiago De Compostela 15706, Spain

[18] NRC Kurchatov Inst, PNPI, Gatchina 188300, Russia

[19] ISEC Coimbra, Coimbra, Portugal

[20] ExtreMe Matter Inst EMMI, D-64291 Darmstadt, Germany

[21] Tech Univ Dresden, D-01062 Dresden, Germany

[22] Univ Utrecht, NL-3584 CC Utrecht, Netherlands

[23] State Univ, Moscow Engn Phys Inst, Moscow 115409, Russia

[24] Frederick Univ, CY-1036 Nicosia, Cyprus

[25] Univ Turin, Dipartimento Fis, I-10125 Turin, Italy

[26] Univ Turin, Ist Nazl Fis Nucl, I-10125 Turin, Italy

[27] Univ Bonn, Helmholtz Inst Strahlen & Kernphys, Bonn, Germany

来源：

EUROPEAN PHYSICAL JOURNAL A | 2017年 / 53卷 / 07期

关键词：

PROTON-PROTON COLLISIONS; HEAVY-ION COLLISIONS; PION-PRODUCTION; CROSS-SECTIONS; DILEPTON PRODUCTION; BEAM ENERGIES; PP; RADIATION; HADES;

D O I：

10.1140/epja/i2017-12341-3

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

We report on the investigation of dielectron production in tagged quasi-free neutron-proton collisions by using a deuteron beam of kinetic energy 1.25 GeV/u impinging on a liquid hydrogen target. Our measurements with HADES confirm a significant excess of e(+)e(-) pairs above the pi(0) mass in the exclusive channel dp -> npe(+)e(-)(p(spect)) as compared to the exclusive channel ppe(+)e(-) measured in proton-proton collisions at the same energy. That excess points to different bremsstrahlung production mechanisms. Two models were evaluated for the role of the charged pion exchange between nucleons and double-Delta excitation combined with intermediate rho-meson production. Differential cross sections as a function of the e(+)e(-) invariant mass and of the angles of the virtual photon, proton and electrons provide valuable constraints and encourage further investigations on both experimental and theoretical sides.

引用

页数：12

共 50 条

[1] Analysis of the exclusive final state npe+e- in the quasi-free np reaction
J. Adamczewski-Musch
O. Arnold
E. T. Atomssa
C. Behnke
A. Belounnas
A. Belyaev
J. C. Berger-Chen
J. Biernat
A. Blanco
C. Blume
M. Böhmer
P. Bordalo
S. Chernenko
L. Chlad
C. Deveaux
J. Dreyer
A. Dybczak
E. Epple
L. Fabbietti
O. Fateev
P. Filip
P. Fonte
C. Franco
J. Friese
I. Fröhlich
T. Galatyuk
J. A. Garzón
R. Gernhäuser
M. Golubeva
F. Guber
M. Gumberidze
S. Harabasz
T. Heinz
T. Hennino
S. Hlavac
C. Höhne
R. Holzmann
A. Ierusalimov
A. Ivashkin
B. Kämpfer
T. Karavicheva
B. Kardan
I. Koenig
W. Koenig
B. W. Kolb
G. Korcyl
G. Kornakov
R. Kotte
W. Kühn
A. Kugler
The European Physical Journal A, 2017, 53
[2] Study of the quasi-free np→npπ+π- reaction with a deuterium beam at 1.25 GeV/nucleon
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