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Measurement of semi-inclusive pi+ electroproduction off the proton
- Source :
- Physical Review D, Physical Review D, American Physical Society, 2009, 80, pp.032004. ⟨10.1103/PhysRevD.80.032004⟩, Osipenko, M, Ripani, M, Ricco, G, Avakian, H, De Vita, R, Adams, G, Amaryan, M J, Ambrozewicz, P, Anghinolfi, M, Asryan, G, Bagdasaryan, H, Baillie, N, Ball, J P, Baltzell, N A, Barrow, S, Battaglieri, M, Bedlinskiy, I, Bektasoglu, M, Bellis, M, Benmouna, N, Berman, B L, Biselli, A S, Blaszczyk, L, Bonner, B E, Bouchigny, S, Boiarinov, S, Bradford, R, Branford, D, Briscoe, W J, Brooks, W K, Bueltmann, S, Burkert, V D, Butuceanu, C, Calarco, J R, Careccia, S L, Carman, D S, Cazes, A, Ceccopieri, F, Chen, S, Cole, P L, Collins, P, Coltharp, P, Corvisiero, P, Crabb, D, Crede, V, Cummings, J P, Dashyan, N, De Masi, R, De Sanctis, E, Watts, D P 2009, ' Measurement of semi-inclusive pi(+) electroproduction off the proton ', Physical Review D-Particles, Fields, Gravitation and Cosmology, vol. 80, no. 3, 032004, pp.-. https://doi.org/10.1103/PhysRevD.80.032004, Physical Review D, 2009, 80, pp.032004. ⟨10.1103/PhysRevD.80.032004⟩
- Publication Year :
- 2009
-
Abstract
- Semi-inclusive {pi}{sup +} electroproduction on protons has been measured with the CLAS detector at Jefferson Lab. The measurement was performed on a liquid-hydrogen target using a 5.75 GeV electron beam. The complete five-fold differential cross sections were measured over a wide kinematic range including the complete range of azimuthal angles between hadronic and leptonic planes, {phi}, enabling us to separate the {phi}-dependent terms. Our measurements of the {phi}-independent term of the cross section at low Bjorken x were found to be in fairly good agreement with pQCD calculations. Indeed, the conventional current fragmentation calculation can account for almost all of the observed cross section, even at small {pi}{sup +} momentum. The measured center-of-momentum spectra are in qualitative agreement with high-energy data, which suggests a surprising numerical similarity between the spectator diquark fragmentation in the present reaction and the antiquark fragmentation measured in e{sup +}e{sup -} collisions. We have observed that the two {phi}-dependent terms of the cross section are small. Within our precision the cos2{phi} term is compatible with zero, except for the low-z region, and the measured cos{phi} term is much smaller in magnitude than the sum of the Cahn and Berger effects.
- Subjects :
- Particle physics
Nuclear and High Energy Physics
Proton
DEEP-INELASTIC-SCATTERING, TARGET FRAGMENTATION REGION, TRANSVERSE-MOMENTUM, PARTON DISTRIBUTIONS, AZIMUTHAL ASYMMETRY, PION ELECTROPRODUCTION, CHARGED HADRONS, HARD PROCESSES, LEADING ORDER, CROSS-SECTION
TARGET FRAGMENTATION REGION
Hadron
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
01 natural sciences
Spectral line
Nuclear physics
Pion
Factorization
0103 physical sciences
010306 general physics
Nuclear Experiment
PION ELECTROPRODUCTION
Physics
DEEP-INELASTIC-SCATTERING
010308 nuclear & particles physics
LEADING ORDER
TRANSVERSE-MOMENTUM
Azimuth
Diquark
CHARGED HADRONS
HARD PROCESSES
PARTON DISTRIBUTIONS
Cathode ray
AZIMUTHAL ASYMMETRY
High Energy Physics::Experiment
CROSS-SECTION
Subjects
Details
- Language :
- English
- ISSN :
- 15507998 and 15502368
- Database :
- OpenAIRE
- Journal :
- Physical Review D, Physical Review D, American Physical Society, 2009, 80, pp.032004. ⟨10.1103/PhysRevD.80.032004⟩, Osipenko, M, Ripani, M, Ricco, G, Avakian, H, De Vita, R, Adams, G, Amaryan, M J, Ambrozewicz, P, Anghinolfi, M, Asryan, G, Bagdasaryan, H, Baillie, N, Ball, J P, Baltzell, N A, Barrow, S, Battaglieri, M, Bedlinskiy, I, Bektasoglu, M, Bellis, M, Benmouna, N, Berman, B L, Biselli, A S, Blaszczyk, L, Bonner, B E, Bouchigny, S, Boiarinov, S, Bradford, R, Branford, D, Briscoe, W J, Brooks, W K, Bueltmann, S, Burkert, V D, Butuceanu, C, Calarco, J R, Careccia, S L, Carman, D S, Cazes, A, Ceccopieri, F, Chen, S, Cole, P L, Collins, P, Coltharp, P, Corvisiero, P, Crabb, D, Crede, V, Cummings, J P, Dashyan, N, De Masi, R, De Sanctis, E, Watts, D P 2009, ' Measurement of semi-inclusive pi(+) electroproduction off the proton ', Physical Review D-Particles, Fields, Gravitation and Cosmology, vol. 80, no. 3, 032004, pp.-. https://doi.org/10.1103/PhysRevD.80.032004, Physical Review D, 2009, 80, pp.032004. ⟨10.1103/PhysRevD.80.032004⟩
- Accession number :
- edsair.doi.dedup.....50f7418453460f0aaa27c14cbdd6265c