Measurement of the Charged-Pion Polarizability

被引：38

作者：

Adolph, C. ^{[8
]}

Akhunzyanov, R. ^{[7
]}

Alexeev, M. C. ^{[7
,27
]}

Alexeev, C. D. ^{[7
]}

Amoroso, A. ^{[27
,29
]}

Andrieux, V. V. ^{[22
]}

Anosov, V. ^{[7
]}

Austregesilo, A. ^{[10
,17
]}

Badelek, B. ^{[31
]}

Balestra, F. ^{[27
,29
]}

Barth, J. ^{[4
]}

Baum, G. ^{[1
]}

Beck, R. ^{[3
]}

Bedfer, Y. ^{[22
]}

Berlin, A. ^{[2
]}

Bernhard, J. ^{[13
]}

Bicker, K. ^{[10
,17
]}

Bieling, J. ^{[4
]}

Birsa, R. ^{[25
]}

Bisplinghoff, J. ^{[3
]}

Bodlak, M. ^{[19
]}

Boer, M. ^{[22
]}

Bordalo, P. ^{[12
,34
]}

Bradamante, F. ^{[24
,25
]}

Braun, C. ^{[8
]}

Bressan, A. ^{[24
,25
]}

Buechele, M. ^{[9
]}

Burtin, E. ^{[22
]}

Capozza, L. ^{[22
]}

Chiosso, M. ^{[27
,29
]}

Chung, S. U. ^{[17
]}

Cicuttin, A. ^{[25
,26
]}

Colantoni, M. ^{[29
]}

Crespo, M. L. ^{[25
,26
]}

Curie, Q. ^{[22
]}

Dalla Torre, S. ^{[25
]}

Dasgupta, S. S. ^{[6
]}

Dasgupta, S. ^{[25
]}

Denisov, O. Yu. ^{[29
]}

Dinkelbach, A. M. ^{[17
]}

Donskov, S. V. ^{[21
]}

Doshita, N. ^{[33
]}

Duic, V. ^{[24
]}

Duennweber, W. ^{[16
]}

Dziewiecki, M. ^{[32
]}

Efremov, A. ^{[7
]}

Elia, C. ^{[24
,25
]}

Eversheim, P. D. ^{[3
]}

Eyrich, W. ^{[8
]}

Faessler, M. ^{[16
]}

机构：

[1] Univ Bielefeld, Fak Phys, D-33501 Bielefeld, Germany

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

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

[4] Univ Bonn, Inst Phys, D-53115 Bonn, Germany

[5] AS CR, Inst Sci Instruments, Brno 61264, Czech Republic

[6] Matrivani Inst Expt Res & Educ, Kolkata 700030, W Bengal, India

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

[8] Univ Erlangen Nurnberg, Inst Phys, D-91054 Erlangen, Germany

[9] Univ Freiburg, Inst Phys, D-79104 Freiburg, Germany

[10] CERN, CH-1211 Geneva 23, Switzerland

[11] Tech Univ Liberec, Liberec, Czech Republic

[12] LIP, P-1000149 Lisbon, Portugal

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

[14] Miyazaki Univ, Miyazaki 8892192, Japan

[15] PN Lebedev Phys Inst, Moscow 119991, Russia

[16] Univ Munich, Dept Phys, D-80799 Munich, Germany

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

[18] Nagoya Univ, Nagoya, Aichi 464, Japan

[19] Charles Univ Prague, Fac Math & Phys, CR-18000 Prague, Czech Republic

[20] Czech Tech Univ, Prague 16636, Czech Republic

[21] Natl Res Ctr, Kurchatov Inst, State Sci Ctr, Inst High Energy Phys, Proivino 142281, Russia

[22] CEA IRFU SPhN Saclay, F-91191 Gif Sur Yvette, France

[23] Tel Aviv Univ, Sch Phys & Astron, IL-69978 Tel Aviv, Israel

[24] Univ Trieste, Dept Phys, I-34127 Trieste, Italy

[25] Ist Nazl Fis Nucl, Trieste Sect, I-34127 Trieste, Italy

[26] Abdus Salam Int Ctr Theoret Phys, I-34151 Trieste, Italy

[27] Univ Turin, Dept Phys, I-10125 Turin, Italy

[28] Univ Piemonte Orientale, I-15100 Alessandria, Italy

[29] Ist Nazl Fis Nucl, Torino Sect, I-10125 Turin, Italy

[30] Natl Ctr Nucl Res, PL-00681 Warsaw, Poland

[31] Univ Warsaw, Fac Phys, PL-00681 Warsaw, Poland

[32] Warsaw Univ Technol, Inst Radioelect, PL-00665 Warsaw, Poland

[33] Yamagata Univ, Yamagata 9928510, Japan

[34] Univ Lisbon, Inst Super Tecn, P-1699 Lisbon, Portugal

来源：

PHYSICAL REVIEW LETTERS | 2015年 / 114卷 / 06期

关键词：

COMPTON-SCATTERING;

D O I：

10.1103/PhysRevLett.114.062002

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The COMPASS collaboration at CERN has investigated pion Compton scattering, pi(-)gamma -> pi(-)gamma, at centerof-mass energy below 3.5 pion masses. The process is embedded in the reaction pi Ni- -> pi(-)gamma Ni, which is initiated by 190 GeV pions impinging on a nickel target. The exchange of quasireal photons is selected by isolating the sharp Coulomb peak observed at smallest momentum transfers, Q(2) < 0.0015 (GeV/c)(2). From a sample of 63 000 events, the pion electric polarizability is determined to be alpha(pi) = (2.0 +/- 0.6(stat) +/- 0.7(syst)) x 10(-4) fm(3) under the assumption alpha(pi) = -beta(pi) which relates the electric and magnetic dipole polarizabilities. It is the most precise measurement of this fundamental low-energy parameter of strong interaction that has been addressed since long by various methods with conflicting outcomes. While this result is in tension with previous dedicated measurements, it is found in agreement with the expectation from chiral perturbation theory. An additional measurement replacing pions by muons, for which the crosssection behavior is unambiguously known, was performed for an independent estimate of the systematic uncertainty.

引用

页数：6

共 17 条

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