6533b833fe1ef96bd129b931
RESEARCH PRODUCT
Measurement of the p(e,e′π+)n reaction close to threshold and at low Q2
D. BaumannAnselm EsserPatrick AchenbachB. S. SchlimmeTh. WalcherS. ŠIrcaS. ŠIrcaIvica FriščićU. MüllerC. Ayerbe GayosoDamir BosnarMichaela ThielM. MihovilovičM. MihovilovičM. SchothL. DebenjakF. SchulzD. G. MiddletonM. O. DistlerJ. PochodzallaR. BöhmA. G. DenigHarald MerkelConcettina SfientiM. Dingsubject
Particle physicsNuclear and High Energy Physicsmedia_common.quotation_subjectKinematicsInterference (wave propagation)01 natural sciencesAsymmetryNuclear physicsCross section (physics)Low-energy pionsPion0103 physical sciencesInvariant mass010306 general physicsNuclear ExperimentNuclear Experimentmedia_commonPhysicsSpectrometer010308 nuclear & particles physicslcsh:QC1-999NATURAL SCIENCES. Physics.PRIRODNE ZNANOSTI. Fizika.Electroproduction experimentsTransverse planeShort-orbit spectrometer ; Low-energy pions ; Electroproduction experimentsShort-orbit spectrometerlcsh:Physicsdescription
The cross section of the $p(e,e'\pi^+)n$ reaction has been measured for five kinematic settings at an invariant mass of $W = 1094$ MeV and for a four-momentum transfer of $Q^2 = 0.078$ (GeV/$c$)$^2$. The measurement has been performed at MAMI using a new short-orbit spectrometer (SOS) of the A1 collaboration, intended for detection of low-energy pions. The transverse and longitudinal cross section terms were separated using the Rosenbluth method and the transverse-longitudinal interference term has been determined from the left-right asymmetry. The experimental cross section terms are compared with the calculations of three models: DMT2001, MAID2007 and $\chi$MAID. The results show that we do not yet understand the dynamics of the fundamental pion.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2017-03-01 |