Induced proton polarization for π0 electroproduction at Q2=0.126 GeV2/c2 around the Δ(1232) resonance

被引：45

作者：

Warren, GA

Alarcon, R

Armstrong, C

Asavapibhop, B

Barkhuff, DH

Bertozzi, W

Burkert, V

Chen, J

Chen, JP

Comfort, JR

Dale, D

Dodson, G

Dolfini, S

Dow, K

Epstein, M

Farkhondeh, M

Finn, JM

Gilad, S

Gothe, RW

Jiang, X

Jones, M

Joo, K

Karabarbounis, A

Kelly, J

Kowalski, S

Kunz, C

Liu, D

Lourie, RW

Madey, R

Margaziotis, D

Markowitz, P

McIntyre, JI

Mertz, C

Milbrath, BD

Miskimen, R

Mitchell, J

Mukhopadhyay, S

Papanicolas, CN

Perdrisat, C

Punjabi, V

Qin, L

Rutt, P

Sarty, A

Shaw, J

Soong, SB

Tieger, D

Tschalaer, C

Turchinetz, W

Ulmer, P

Van Verst, S

机构：

[1] Arizona State Univ, Dept Phys & Astron, Tempe, AZ 85287 USA

[2] Univ Bonn, Dept Phys, D-5300 Bonn, Germany

[3] Calif State Univ Los Angeles, Dept Phys & Astron, Los Angeles, CA 90032 USA

[4] Coll William & Mary, Dept Phys, Williamsburg, VA 23187 USA

[5] Florida State Univ, Dept Phys, Tallahassee, FL 32306 USA

[6] Kent State Univ, Dept Phys, Kent, OH 44242 USA

[7] MIT, Dept Phys, Nucl Sci Lab, Cambridge, MA 02139 USA

[8] MIT, Bates Accelerator Ctr, Cambridge, MA 02139 USA

[9] Norfolk State Univ, Dept Phys & Engn, Norfolk, VA 23504 USA

[10] Old Dominion Univ, Dept Phys, Norfolk, VA 23529 USA

[11] Rutgers State Univ, Dept Phys, Piscataway, NJ 08855 USA

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

[13] Univ Athens, Inst Accelerating Syst & Applicat, Athens, Greece

[14] Univ Athens, Dept Phys, Athens, Greece

[15] Univ Illinois, Dept Phys, Urbana, IL 61801 USA

[16] Univ Kentucky, Dept Phys & Astron, Lexington, KY 40506 USA

[17] Univ Maryland, Dept Phys & Astron, College Pk, MD 20742 USA

[18] Univ Massachusetts, Dept Phys, Amherst, MA 01003 USA

[19] Univ Virginia, Inst Nucl & Particle Phys, Charlottesville, VA 22901 USA

[20] Univ Virginia, Dept Phys, Charlottesville, VA 22901 USA

来源：

PHYSICAL REVIEW C | 1998年 / 58卷 / 06期

关键词：

D O I：

10.1103/PhysRevC.58.3722

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：

We present a measurement of the induced proton polarization P-n in pi(0) electroproduction on the proton around the Delta resonance. The measurement was made at a central invariant mass and a squared four-momentum transfer of W=1231 MeV and Q(2)=0.126 GeV2/c(2), respectively. We measured a large induced polarization, P-n = -0.397 +/- 0.055 +/- 0.009. The data suggest that the scalar background is larger than expected from a recent effective Hamiltonian model. [S0556-2813(98)02012-3].

引用

页码：3722 / 3725

页数：4

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