# WA89 experiment
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{{short description|Physics experiment}}
thumb|WA89 experiment equipment at CERN
The '''WA89 experiment (Omega/Hyperon)''' was a [particle physics](/source/particle_physics) experiment operating from 1989 to 1994 in the West Area of the [SPS accelerator](/source/Super_Proton_Synchrotron) at [CERN](/source/CERN).[{{Cite journal |last1=Alexandrov |first1=Yu. A |last2=Clement |first2=M |last3=Dropmann |first3=F |last4=Fournier |first4=A |last5=Grafström |first5=P |last6=Hubbard |first6=E |last7=Paul |first7=S |last8=Siebert |first8=H. W |last9=Trombini |first9=A |last10=Zavertiaev |first10=M |date=1998-05-11 |title=The high-intensity hyperon beam at CERN |url=https://www.sciencedirect.com/science/article/pii/S0168900298002289 |journal=Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment |language=en |volume=408 |issue=2 |pages=359–372 |doi=10.1016/S0168-9002(98)00228-9 |issn=0168-9002|arxiv=physics/9801006 |bibcode=1998NIMPA.408..359A }}][{{Cite web |last= |first= |date= |title=Experiments at CERN: WA89/Omega/Hyperon—Hyperon beam experiment |url=https://greybook.cern.ch/greybook/experiment/detail?id=WA89 |archive-url= |archive-date= |access-date=2020-05-15 |website=}}] It was a large acceptance forward spectrometer dedicated to the [spectroscopy](/source/spectroscopy) of charmed strange baryons and exotic multiquark states produced by a hyperon beam.
The initial aims of the hyperon beam experiment were to investigate charmed-strange quark baryons, verify and investigate the U(3100) and study baryonic resonances and decays whilst searching for the double-strange dibaryon H.[{{Cite journal |last1=Forino |first1=A |last2=Gessaroli |first2=R |last3=Quareni-Vignudelli |first3=A |last4=Viaggi |first4=F |last5=Barberis |first5=D |date=1987 |title=Proposal for a new hyperon beam experiment at the CERN-SPS using the Omega facility |url=https://cds.cern.ch/record/301194?ln=en |journal=CERN. Geneva. SPS Experiments Committee}}]
== Experimental setup ==
The WA89 experiment consisted of a [beamline](/source/beamline) and a forward [spectrometer](/source/spectrometer). The beamline contained the [proton beam](/source/Charged_particle_beam) hitting the hyperon production target which was followed by a {{cvt|13|m|ft|adj=mid|-long}} hyperon channel. Three [dipoles](/source/Dipole) were used to provide a bending power of 8.4 [Tesla](/source/Tesla_(unit))-[meter](/source/meter)s. The target region consisted of two adjacent targets surrounded by [muon](/source/muon) strip detectors. Following this, a {{cvt|15|m|ft|adj=mid|-long}} [Λ](/source/Lambda_baryon) decay region was filled with six [drift chamber](/source/drift_chamber) sets and a spectrometer magnet.[{{Cite journal |last=Paul |first=S. |date=1989 |title=1. The new hyperon beam experiment at CERN |url=https://doi.org/10.1063/1.38934 |journal=AIP Conference Proceedings |volume=196 |pages=280–284 |publisher=AIP |doi=10.1063/1.38934|bibcode=1989AIPC..196..280P |url-access=subscription }}]
The beam particle trajectories along with their momenta were measured with a scintillating fibre [hodoscope](/source/hodoscope) in the beamline and a silicon [microstrip detector](/source/microstrip_detector) at the end of the line.