Helicity dependent cross sections for the photoproduction of π0π ± pairs from quasi-free nucleons

被引：0

作者：

Ghosal, D. ^{[1
,20
]}

Sokhoyan, V. ^{[2
]}

Fix, A. ^{[3
]}

Lutterer, S. ^{[1
]}

Abt, S. ^{[1
]}

Achenbach, P. ^{[2
]}

Afzal, F. ^{[4
]}

Ahmed, Z. ^{[5
]}

Annand, J. R. M. ^{[6
]}

Bashkanov, M. ^{[7
]}

Beck, R. ^{[4
]}

Biroth, M. ^{[2
]}

Borisov, N. ^{[8
]}

Braghieri, A. ^{[9
]}

Briscoe, W. J. ^{[11
]}

Cividini, F. ^{[2
]}

Collicot, C. ^{[12
]}

Costanza, S. ^{[9
,10
]}

Denig, A. ^{[2
]}

Dieterle, M. ^{[1
]}

Dolzhikov, A. S. ^{[8
]}

Downie, E. J. ^{[11
]}

Drexler, P. ^{[2
]}

Fegan, S. ^{[7
]}

Gardner, S. ^{[6
]}

Glazier, D. I. ^{[6
]}

Gorodnov, I. ^{[8
]}

Gradl, W. ^{[2
]}

Gunther, M. ^{[1
]}

Gurevich, D. ^{[13
]}

Heijkenskjoeld, L. ^{[2
]}

Hornidge, D. ^{[14
]}

Huber, G. M. ^{[5
]}

Jermann, N. ^{[1
]}

Kaser, A. ^{[1
]}

Kashevarov, V. L. ^{[2
,15
]}

Korolija, M. ^{[16
]}

Krusche, B. ^{[1
]}

Lazarev, A. ^{[8
]}

Livingston, K. ^{[6
]}

MacGregor, I. J. D. ^{[6
]}

Manley, D. M. ^{[17
]}

Martel, P. P. ^{[2
]}

Meier, Ch. ^{[1
]}

Miskimen, R. ^{[19
]}

Mocanu, M. ^{[7
]}

Mornacchi, E. ^{[2
]}

Mullen, C. ^{[6
]}

Neganov, A. ^{[8
]}

Neiser, A. ^{[2
]}

机构：

[1] Univ Basel, Dept Phys, CH-4056 Basel, Switzerland

[2] Johannes Gutenberg Univ Mainz, Inst Kernphys, D-55099 Mainz, Germany

[3] Tomsk Polytech Univ, Tomsk, Russia

[4] Univ Bonn, Helmholtz Inst Strahlen & Kernphys, D-53115 Bonn, Germany

[5] Univ Regina, Regina, SK S4S 0A2, Canada

[6] Univ Glasgow, SUPA Sch Phys & Astron, Glasgow G12 8QQ, Lanark, Scotland

[7] Univ York, Dept Phys, York Y010 5DD, N Yorkshire, England

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

[9] Ist Nazl Fis Nucl, Sez Pavia, I-27100 Pavia, Italy

[10] Univ Pavia, Dipartimento Fis, Pavia, Italy

[11] George Washington Univ, Ctr Nucl Studies, Washington, DC 20052 USA

[12] St Marys Univ, Dept Phys & Astron, Halifax, NS E4L 1E6, Canada

[13] Inst Nucl Res, RU-125047 Moscow, Russia

[14] Mt Allison Univ, Sackville, NB E4L 1E6, Canada

[15] Lebedev Phys Inst, RU-119991 Moscow, Russia

[16] Rudjer Boskovic Inst, HR-10000 Zagreb, Croatia

[17] Kent State Univ, Kent, OH 44242 USA

[18] Ruhr Univ, Inst Expt Phys, D-44780 Bochum, Germany

[19] Univ Massachusetts, Amherst, MA 01003 USA

[20] Univ Liverpool, Liverpool, Merseyside, England

来源：

PHYSICS LETTERS B | 2023年 / 847卷

基金：

俄罗斯科学基金会; 美国国家科学基金会; 加拿大自然科学与工程研究理事会; 英国科学技术设施理事会;

关键词：

DOUBLE-PION-PHOTOPRODUCTION; 1ST MEASUREMENT; POLARIZATION; PHOTON; SINGLE; MAMI;

D O I：

10.1016/j.physletb.2023.138273

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Photoproduction of pi(0)pi(+/-)-pairs from quasifree nucleons bound in the deuteron has been investigated to study the helicity dependence of this reaction. Measurements with a liquid deuterium target were used to extract the unpolarized cross sections for reactions on protons and neutrons. A deuterated, longitudinally polarized solid-butanol target, together with a circularly polarized photon beam, determined the double polarization observable. E. From these results the spin-dependent cross sections sigma(1/2) and sigma(3/2), corresponding to the anti-parallel and parallel spin configurations of the beam photon and target nucleon, have been derived. The measurements were performed at the Mainz MAMI accelerator with tagged, circularly-polarized photon beams produced via bremsstrahlung from longitudinally polarized electron beams. The reaction products were detected with an almost 4 pi solid-angle covering calorimeter composed of the Crystal Ball and TAPS detectors, supplemented by plastic scintillation detectors for charged particle identification. The results are sensitive to sequential decays of nucleon resonances via intermediate states and also to the decay of nucleon resonances by emission of charged rho mesons, and are compared to recent model results.

引用

页数：8

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