6533b826fe1ef96bd1283c2a
RESEARCH PRODUCT
Rosenbluth Separation of the π^{0} Electroproduction Cross Section.
M. BrossardE. LongWilliam A. TobiasA. KelleherA. SahaD. J. MargaziotisPete MarkowitzBogdan WojtsekhowskiD. G. MeekinsR. SubediO. GlamazdinChunhui ChenS. ChandavarC. M. SuteraF. SabatiéR. De LeoOlfred HansenMaxime DefurneJ. P. ChenKiadtisak SaenboonruangL. El FassiW. U. BoeglinN. NuruzzamanB. SawatzkyAbdurahim RakhmanS. GolgeM. MagneM. N. H. RashadJ. HuangG. M. UrciuoliM. FriendS. KoiralaA. Martí Jiménez-argüelloS. RiordanC. W. De JagerK. A. AniolP. Nadel-turonskiYujie QiangH. YaoR. A. LindgrenJ. J. LeroseAndrew PuckettA. DeurC. E. HydeI. KoroverR. MichaelsCynthia KeppelX. ZhanZ. W. ZhaoZ. YeE. FucheyJie ZhangV. A. PunjabiP.y. BertinC. DesnaultH. AlbatainehP. ZhuM. MazouzZ. AhmedHo. KangG.v. RussoL. SelvyR. ParemuzyanD. FlayX. ZhengS. FrullaniV. BelliniL. ZanaM. HuangSimon ŠIrcaG. M. HuberF. GaribaldiH. KangM. BenaliA. CamsonneVincent SulkoskyJuliette MammeiFranco MeddiRolf EntJ. RocheD. GaskellJ. GomezM. L. SperdutoA. ShahinyanP. SolvignonMustafa CananKalyan AlladaM. MihovilovicN. MuangmaS. IqbalD. WangDouglas HiginbothamF. ItardT. HolmstromC. Muñoz CamachoB. ZhaoA. GiusaTanja Hornsubject
Particle physicslongitudinalinterferenceGeneral Physics and Astronomyparton: distribution functionPartonhard exclusive electroproduction; mesons[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]01 natural sciencesHigh Energy Physics - ExperimentNuclear physicspi: distribution amplitudegeneralized parton distribution: transversityPiondeep inelastic scattering0103 physical scienceshard exclusive electroproduction[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]quantum chromodynamics: perturbation theory010306 general physicsNuclear ExperimentNuclear ExperimentmesonsQuantum chromodynamicsPhysics010308 nuclear & particles physicsscattering amplitudemomentum transferSigmanucleon: generalized parton distributionScattering amplitudetransverseDistribution (mathematics)Amplitudepi0: electroproductiontwistHigh Energy Physics::ExperimentNucleonchannel cross section: measuredJefferson Labexperimental resultsdescription
We present deeply virtual $\pi^0$ electroproduction cross-section measurements at $x_B$=0.36 and three different $Q^2$--values ranging from 1.5 to 2 GeV$^2$, obtained from experiment E07-007 that ran in the Hall A at Jefferson Lab. The Rosenbluth technique was used to separate the longitudinal and transverse responses. Results demonstrate that the cross section is dominated by its transverse component, and thus is far from the asymptotic limit predicted by perturbative Quantum Chromodynamics. An indication of a non-zero longitudinal contribution is provided by the interference term $\sigma_{LT}$ also measured. Results are compared with several models based on the leading twist approach of Generalized Parton Distributions (GPDs). In particular, a fair agreement is obtained with models where the scattering amplitude is described by a convolution of chiral-odd (transversity) GPDs of the nucleon with the twist-3 pion distribution amplitude. Therefore, neutral pion electroproduction may offer the exciting possibility of accessing transversity GPDs through experiment.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2016-08-02 | Physical review letters |