Precise measurement of Σ beam asymmetry for positive pion photoproduction on the proton from 550 to 1100 MeV

被引：41

作者：

Ajaka, J ^{[1
]}

Bartalini, O

Battaglieri, M

Bellini, V

Bocquet, JP

Calvat, PM

Capogni, M

Castoldi, M

Ciciani, L

D'Angelo, A

Didelez, JP

Di Salvo, R

Duval, MA

Gaulard, C

Gervino, G

Ghio, F

Girolami, B

Guidal, M

Guinault, E

Hourany, E

Jejcic, A

Kilvington, I

Kouznetsov, V

Lapik, A

Sandri, PL

Lleres, A

Morriciani, D

Nedorezov, V

Nicoletti, L

Rebreyend, D

Renard, F

Ripani, M

Rudnev, N

Schaerf, C

Turinge, A

Zucchiatti, A

机构：

[1] IN2P3, Inst Phys Nucl, F-91406 Orsay, France

[2] Univ Roma Tor Vergata, I-00133 Rome, Italy

[3] Ist Nazl Fis Nucl, I-00133 Rome, Italy

[4] Univ Genoa, I-16146 Genoa, Italy

[5] Ist Nazl Fis Nucl, I-16146 Genoa, Italy

[6] Ist Nazl Fis Nucl, Lab Nazl Sud, I-95123 Catania, Italy

[7] Catania Univ, I-95123 Catania, Italy

[8] IN2P3, Inst Sci Nucl, F-38026 Grenoble, France

[9] Ist Nazl Fis Nucl, Nazl Frascati Lab, I-00044 Frascati, Italy

[10] Ist Nazl Fis Nucl, Sez Torino, I-10125 Turin, Italy

[11] Univ Turin, I-10125 Turin, Italy

[12] Ist Nazl Fis Nucl, Sez Sanita, I-00161 Rome, Italy

[13] Ist Super Sanita, I-00161 Rome, Italy

[14] European Synchrotron Radiat Facil, F-38026 Grenoble, France

[15] Nucl Res Inst, Moscow 117312, Russia

[16] Ctr Siciliano Fis Nucl & Struttura Mat, I-95125 Catania, Italy

[17] Inst Theoret & Expt Phys, Moscow 117259, Russia

[18] RRC, Kurchatov Inst, Moscow, Russia

来源：

PHYSICS LETTERS B | 2000年 / 475卷 / 3-4期

关键词：

pi(+) photoproduction; Baryon resonances; polarization observables; photon beam asymmetry; partial wave analysis;

D O I：

10.1016/S0370-2693(99)01396-9

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Sigma beam asymmetries for pi(+) photoproduction on the proton have been measured in the energy range 550-1100 MeV over a wide angular range. The statistical and systematic errors of the data are much lower than in previous measurements, due to the high polarization of the photon beam and the cylindrical geometry of the 4 pi detector. Our results confirm the predictions W198 and SM95 of the VPI partial-wave analysis at the energies below 850 MeV and at 1050 MeV while, between these two regions, they differ at backward angles. It may indicate the smaller contribution of S-11,,(1650) resonance, than it was quoted previously by the VPI and PDG groups. A newly developed unitary isobar model reproduces our data up to 950 MeV. (C) 2000 Elsevier Science B.V. All rights reserved.

引用

页码：372 / 377

页数：6

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