منابع مشابه
Polarized Protons in HERA
Polarized proton beams at HERA can currently only be produced by extracting a beam from a polarized source and then accelerating it in the three synchrotrons at DESY. In this paper, the processes which can depolarize a proton beam in circular accelerators are explained, devices which could avoid this depolarization in the DESY accelerator chain are described, and specific problems which become ...
متن کاملExpanding Protons Seen by Hera
We show that the rising total photoproduction cross section recently observed at HERA is entirely consistant with the impact-picture in the theory of expanding protons which was proposed more than twenty years ago. More accurate data, which is expected to be forthcoming soon, will give this prediction a stringent test. Key-Words : Total photon cross section, impact-picture. Number of figures : ...
متن کاملHadron Spectroscopy in Electrons-protons Collisions at Hera
Experimental evidence for an exotic baryon first came in 2003 from the observation of a S = +1 narrow resonance 1 at 1540± 10 MeV which can be associated with an exotic pentaquark state with content uudds̄. Confirmation came quickly from a series of experiments, with the observation of sharp peaks 2,3,4,5 in the nK and pK S invariant mass spectrum near 1540 MeV, in each case with a width limited...
متن کاملLongitudinal Shottky Signal Monitoring for Protons in Hera
Stable longitudinal behavior of the protons is an important feature for future HERA operation. Specific diagnostic tools must be developed for this reason. In this case a standard wall current monitor is used to detect a beam signal from the incoherent motion of the protons due to both coasting beam and synchrotron oscillations during luminosity operation. This will be helpful to understand the...
متن کاملProduction of Protons in Photoproduction at Hera * on Behalf on the H1 Collaboration
A measurement of the inclusive cross-section for the photoproduction of protons in the central fragmentation region at HERA is presented. The measured cross-section is compared with the prediction of the PYTHIA MC model. The obtained value of the diquark suppression factor in the Lund string model is different from that obtained in ee data. The dependence of the cross-section as a function of t...
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ژورنال
عنوان ژورنال: Nature
سال: 1991
ISSN: 0028-0836,1476-4687
DOI: 10.1038/351261b0