Unique Access to u-Channel Physics: Exclusive Backward-Angle Omega Meson Electroproduction

被引：16

作者：

Li, W. B. ^{[1
,2
]}

Huber, G. M. ^{[1
]}

Blok, H. P. ^{[3
,4
]}

Gaskell, D. ^{[5
]}

Horn, T. ^{[6
]}

Semenov-Tian-Shansky, K. ^{[7
,8
]}

Pire, B. ^{[9
]}

Szymanowski, L. ^{[10
]}

Laget, J-M ^{[5
]}

Aniol, K. ^{[11
]}

Arrington, J. ^{[12
]}

Beise, E. J. ^{[13
]}

Boeglin, W. ^{[14
]}

Brash, E. J. ^{[15
]}

Breuer, H. ^{[13
]}

Chang, C. C. ^{[13
]}

Christy, M. E. ^{[16
]}

Ent, R. ^{[5
]}

Gibson, E. F. ^{[17
]}

Holt, R. J. ^{[18
]}

Jin, S. ^{[19
]}

Jones, M. K. ^{[5
]}

Keppel, C. E. ^{[5
,16
]}

Kim, W. ^{[19
]}

King, P. M. ^{[20
]}

Kovaltchouk, V ^{[21
]}

Liu, J. ^{[22
]}

Lolos, G. J. ^{[1
]}

Mack, D. J. ^{[5
]}

Margaziotis, D. J. ^{[11
]}

Markowitz, P. ^{[14
]}

Matsumura, A. ^{[23
]}

Meekins, D. ^{[5
]}

Miyoshi, T. ^{[23
]}

Mkrtchyan, H. ^{[24
]}

Niculescu, I ^{[25
]}

Okayasu, Y. ^{[23
]}

Pentchev, L. ^{[5
]}

Perdrisat, C. ^{[26
]}

Potterveld, D. ^{[12
]}

Punjabi, V ^{[27
]}

Reimer, P. E. ^{[12
]}

Reinhold, J. ^{[14
]}

Roche, J. ^{[20
]}

Roos, P. G. ^{[13
]}

Sarty, A. ^{[28
]}

Smith, G. R. ^{[5
]}

Tadevosyan, V ^{[24
]}

Tang, L. G. ^{[5
,16
]}

Tvaskis, V ^{[3
,4
]}

机构：

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

[2] Colle & William & Mary, Williamsburg, VA 23185 USA

[3] Vrije Univ Amsterdam, NL-1081 HV Amsterdam, Netherlands

[4] NIKHEF, Postbus 41882, NL-1009 DB Amsterdam, Netherlands

[5] Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA

[6] Catholic Univ Amer, Washington, DC 20064 USA

[7] Kurchatov Inst, Petersburg Nucl Phys Inst, Natl Res Ctr, RU-188300 Gatchina, Russia

[8] St Petersburg Natl Res Acad Univ, Russian Acad Sci, RU-194021 St Petersburg, Russia

[9] IP Paris, Ecole Polytech, CNRS, CPHT, F-91128 Palaiseau, France

[10] Natl Ctr Nucl Res NCBJ, PL-02093 Warsaw, Poland

[11] Calif State Univ Los Angeles, Los Angeles, CA 90032 USA

[12] Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA

[13] Univ Maryland, College Pk, MD 20742 USA

[14] Florida Int Univ, Miami, FL 33119 USA

[15] Christocher Newport Univ, Newport News, VA 23606 USA

[16] Hampton Univ, Hampton, VA 23668 USA

[17] Calif State Univ Sacramento, Sacramento, CA 95819 USA

[18] CALTECH, Pasadena, CA 91125 USA

[19] Kyungpook Natl Univ, Daegu 702701, South Korea

[20] Ohio Univ, Athens, OH 45701 USA

[21] Ontario Tech Univ, Oshawa, ON L1G 0C5, Canada

[22] Shanghai Jiao Tong Univ, Shanghai 200240, Peoples R China

[23] Tohoku Univ, Sendai, Miyagi 9808578, Japan

[24] AI Alikhanyan Natl Sci Lab, Yerevan 0036, Armenia

[25] James Madison Univ, Harrisonburg, VA 22807 USA

[26] Coll William & Mary, Williamsburg, VA 23187 USA

[27] Norfolk State Univ, Norfolk, VA 23504 USA

[28] St Marys Univ, Halifax, NS B3H 3C3, Canada

[29] DESY, D-22607 Hamburg, Germany

[30] Pacific Northwest Natl Lab, Richland, WA 99352 USA

[31] Univ Virginia, Charlottesville, VA 22904 USA

来源：

PHYSICAL REVIEW LETTERS | 2019年 / 123卷 / 18期

基金：

加拿大自然科学与工程研究理事会;

关键词：

PHOTOPRODUCTION;

D O I：

10.1103/PhysRevLett.123.182501

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Backward-angle meson electroproduction above the resonance region, which was previously ignored, is anticipated to offer unique access to the three quark plus sea component of the nucleon wave function. In this Letter, we present the first complete separation of the four electromagnetic structure functions above the resonance region in exclusive. electroproduction off the proton, ep -> e'p omega, at central Q(2) values of 1.60, 2.45 GeV2, at W = 2.21 GeV. The results of our pioneering -u approximate to-u(min) study demonstrate the existence of a unanticipated backward-angle cross section peak and the feasibility of full L/T/LT/TT separations in this never explored kinematic territory. At Q(2) = 2.45 GeV2, the observed dominance of sigma(T) over sigma(L), is qualitatively consistent with the collinear QCD description in the near-backward regime, in which the scattering amplitude factorizes into a hard subprocess amplitude and baryon to meson transition distribution amplitudes: universal nonperturbative objects only accessible through backward-angle kinematics.

引用

页数：6

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