Experimental study of the A(e,e′π+) reaction on 1H, 2H, 12C, 27Al, 63Cu, and 197Au

被引：25

作者：

Qian, X. ^{[1
]}

Horn, T. ^{[2
,3
]}

Clasie, B. ^{[4
]}

Arrington, J. ^{[5
]}

Asaturyan, R. ^{[6
]}

Benmokhtar, F. ^{[2
]}

Boeglin, W. ^{[7
]}

Bosted, P. ^{[3
]}

Bruell, A. ^{[3
]}

Christy, M. E. ^{[8
]}

Chudakov, E. ^{[3
]}

Dalton, M. M. ^{[9
]}

Daniel, A. ^{[10
]}

Day, D. ^{[11
]}

Dutta, D. ^{[1
,12
]}

El Fassi, L. ^{[5
]}

Ent, R. ^{[3
]}

Fenker, H. C. ^{[3
]}

Ferrer, J. ^{[13
]}

Fomin, N. ^{[11
]}

Gao, H. ^{[1
]}

Garrow, K. ^{[14
]}

Gaskell, D. ^{[3
]}

Gray, C. ^{[9
]}

Huber, G. M. ^{[15
]}

Jones, M. K. ^{[3
]}

Kalantarians, N. ^{[10
]}

Keppel, C. E. ^{[3
,8
]}

Kramer, K. ^{[1
]}

Li, Y. ^{[10
]}

Liang, Y. ^{[16
]}

Lung, A. F. ^{[3
]}

Malace, S. ^{[8
]}

Markowitz, P. ^{[7
]}

Matsumura, A. ^{[17
]}

Meekins, D. G. ^{[3
]}

Mertens, T. ^{[18
]}

Miyoshi, T. ^{[10
]}

Mkrtchyan, H. ^{[6
]}

Monson, R. ^{[19
]}

Navasardyan, T. ^{[6
]}

Niculescu, G. ^{[13
]}

Niculescu, I. ^{[13
]}

Okayasu, Y. ^{[17
]}

Opper, A. K. ^{[16
]}

Perdrisat, C. ^{[20
]}

Punjabi, V. ^{[21
]}

Rauf, A. W. ^{[22
]}

Rodriquez, V. M. ^{[10
]}

Rohe, D. ^{[18
]}

机构：

[1] Duke Univ, Triangle Univ Nucl Lab, Durham, NC 27706 USA

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

[3] TJNAF, Div Phys, Newport News, VA USA

[4] MIT, Nucl Sci Lab, Cambridge, MA 02139 USA

[5] Argonne Natl Lab, Argonne, IL 60439 USA

[6] Yerevan Phys Inst, Yerevan 375036, Armenia

[7] Florida Int Univ, Miami, FL 33199 USA

[8] Hampton Univ, Hampton, VA 23668 USA

[9] Univ Witwatersrand, Johannesburg, South Africa

[10] Univ Houston, Houston, TX USA

[11] Univ Virginia, Charlottesville, VA USA

[12] Mississippi State Univ, Mississippi State, MS 39762 USA

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

[14] TRIUMF, Vancouver, BC V6T 2A3, Canada

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

[16] Ohio Univ, Athens, OH 45701 USA

[17] Tohoku Univ, Sendai, Miyagi 980, Japan

[18] Univ Basel, Basel, Switzerland

[19] Cent Michigan Univ, Mt Pleasant, MI 48859 USA

[20] Coll William & Mary, Williamsburg, VA USA

[21] Norfolk State Univ, Norfolk, VA USA

[22] Univ Manitoba, Winnipeg, MB, Canada

[23] Rensselaer Polytech Inst, Troy, NY USA

来源：

PHYSICAL REVIEW C | 2010年 / 81卷 / 05期

基金：

美国国家科学基金会; 加拿大自然科学与工程研究理事会;

关键词：

NUCLEAR TRANSPARENCY; ELECTRON-SCATTERING; COLOR-TRANSPARENCY; A-DEPENDENCE; ELECTROPRODUCTION; FRAGMENTATION; FACTORIZATION; DIFFRACTION; HADRONS; EP;

D O I：

10.1103/PhysRevC.81.055209

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：

Cross sections for the H-1(e,e'pi(+))n process on H-1, H-2, C-12, Al-27, Cu-63, and Au-197 targets were measured at the Thomas Jefferson National Accelerator Facility ( Jefferson Lab) to extract nuclear transparencies. Data were taken from Q(2) = 1.1- 4.7 GeV2 for a fixed center-of-mass energy of W = 2.14 GeV. The ratio of sigma(L) and sigma(T) was extracted from the measured cross sections for H-1, H-2, C-12, and Cu-63 targets at Q(2) = 2.15 and 4.0 GeV2, allowing for additional studies of the reaction mechanism. In this article, we present the experimental setup and the analysis of the data in detail, including systematic uncertainty studies. Differential cross sections and nuclear transparencies as a function of the pion momentum at different values of Q(2) are presented. Our results are consistent with the predicted early onset of color transparency in mesons. Global features of the data are discussed and the data are compared with model calculations for the H-1(e,e'pi(+)) n reaction from nuclear targets.

引用

页数：27

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