Measurement of ep→epπ0 beam spin asymmetries above the resonance region

R. DeMasi; Angela Biselli

doi:10.1103/PhysRevC.77.042201

Measurement of ep→epπ0 beam spin asymmetries above the resonance region

R. DeMasi, Angela Biselli

Fairfield University

Research output: Contribution to journal › Article › peer-review

Abstract

<p> The beam spin asymmetry (BSA) in the exclusive reaction e→p→epπ0 was measured with the CEBAF 5.77 GeV polarized electron beam and Large Acceptance Spectrometer (CLAS). The xB,Q2,t, and ϕ dependences of the π0 BSA are presented in the deep inelastic regime. The asymmetries are fitted with a sinϕ function and their amplitudes are extracted. Overall, they are of the order of 0.04–0.11 and roughly independent of t. This is the signature of a nonzero longitudinal-transverse interference. The implications concerning the applicability of a formalism based on generalized parton distributions, as well as the extension of a Regge formalism at high photon virtualities, are discussed.</p>

Original language	American English
Journal	Physical Review C
Volume	77
DOIs	https://doi.org/10.1103/PhysRevC.77.042201
State	Published - Jan 1 2008

Disciplines

Physical Sciences and Mathematics
Physics

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Measurement of ep ep 0 beam spin asymmetries above the resonanceFinal published version, 233 KBLicense: CC BY

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title = "Measurement of ep→epπ0 beam spin asymmetries above the resonance region",

abstract = " The beam spin asymmetry (BSA) in the exclusive reaction e\→p\→ep\π0 was measured with the CEBAF 5.77 GeV polarized electron beam and Large Acceptance Spectrometer (CLAS). The xB,Q2,t, and \ϕ dependences of the \π0 BSA are presented in the deep inelastic regime. The asymmetries are fitted with a sin\ϕ function and their amplitudes are extracted. Overall, they are of the order of 0.04\–0.11 and roughly independent of t. This is the signature of a nonzero longitudinal-transverse interference. The implications concerning the applicability of a formalism based on generalized parton distributions, as well as the extension of a Regge formalism at high photon virtualities, are discussed.",

author = "R. DeMasi and Angela Biselli",

year = "2008",

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doi = "10.1103/PhysRevC.77.042201",

language = "American English",

volume = "77",

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TY - JOUR

T1 - Measurement of ep→epπ0 beam spin asymmetries above the resonance region

AU - DeMasi, R.

AU - Biselli, Angela

PY - 2008/1/1

Y1 - 2008/1/1

N2 - The beam spin asymmetry (BSA) in the exclusive reaction e→p→epπ0 was measured with the CEBAF 5.77 GeV polarized electron beam and Large Acceptance Spectrometer (CLAS). The xB,Q2,t, and ϕ dependences of the π0 BSA are presented in the deep inelastic regime. The asymmetries are fitted with a sinϕ function and their amplitudes are extracted. Overall, they are of the order of 0.04–0.11 and roughly independent of t. This is the signature of a nonzero longitudinal-transverse interference. The implications concerning the applicability of a formalism based on generalized parton distributions, as well as the extension of a Regge formalism at high photon virtualities, are discussed.

AB - The beam spin asymmetry (BSA) in the exclusive reaction e→p→epπ0 was measured with the CEBAF 5.77 GeV polarized electron beam and Large Acceptance Spectrometer (CLAS). The xB,Q2,t, and ϕ dependences of the π0 BSA are presented in the deep inelastic regime. The asymmetries are fitted with a sinϕ function and their amplitudes are extracted. Overall, they are of the order of 0.04–0.11 and roughly independent of t. This is the signature of a nonzero longitudinal-transverse interference. The implications concerning the applicability of a formalism based on generalized parton distributions, as well as the extension of a Regge formalism at high photon virtualities, are discussed.

UR - https://digitalcommons.fairfield.edu/physics-facultypubs/62

U2 - 10.1103/PhysRevC.77.042201

DO - 10.1103/PhysRevC.77.042201

M3 - Article

VL - 77

JO - Physical Review C

JF - Physical Review C

ER -

Measurement of ep→epπ0 beam spin asymmetries above the resonance region

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