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| NA48/1 | |
|---|---|
| Name | NA48/1 |
| Experiment | Fixed-target |
| Location | CERN |
| Collaboration | NA48 Collaboration |
| Period | 2002 |
| Facility | Super Proton Synchrotron |
| Spokesperson | Chris F. �� (example) |
NA48/1 NA48/1 was a particle physics fixed-target experiment at CERN using the Super Proton Synchrotron beamline to study rare decays of neutral kaons and hyperons. The run in 2002 complemented measurements by experiments such as KTeV, NA31, NA48, and E787 while interfacing with accelerator operations like SPS cycles and coordinating with detector groups at CERN Meyrin and institutions including University of Zurich, ETH Zurich, University of Manchester, INFN, and University of Birmingham.
NA48/1 operated within the research environment shaped by projects such as CERN SPS, CERN PS, CERN LHC planning, and international programs like Particle Data Group reviews and PDG summaries. The experiment fit into a lineage of kaon physics efforts including CP Violation studies performed by NA31 and NA48 and rare-decay searches conducted by KOTO and KTeV. Institutional participation mirrored collaborations seen in INFN Sezione di Roma, CERN Detector Technologies groups, and university laboratories in United Kingdom, Switzerland, Germany, and Italy.
NA48/1 used a high-intensity neutral beam produced by protons from the Super Proton Synchrotron striking a beryllium target in the North Area complex, similar to techniques employed in NA48 and earlier fixed-target experiments like NA14 and NA27. The physics program targeted rare decays of the K0_L and K0_S systems and hyperon channels related to Λ and Ξ decays, complementing searches by E787 and E949. Run coordination required interaction with accelerator groups such as SPS Division, data acquisition teams from CERN EP, and simulation efforts referencing frameworks like GEANT and ROOT.
The detector suite combined elements derived from apparatus used in experiments such as NA48 and KTeV, including an electromagnetic calorimeter inspired by Liquid Krypton calorimeter designs, magnetic spectrometers akin to systems used in NA31, and tracking chambers reminiscent of drift chamber technologies from CERN PS experiments. Particle identification relied on Cherenkov counters similar to devices in RICH detectors developed by groups at CERN and INFN, while muon identification used absorber and scintillator stacks akin to modules used in LHCb prototypes. Readout electronics integrated components from projects such as ALICE, ATLAS, and CMS R&D programs, and calibration strategies referenced techniques from NA48 calibrations and KTeV laser systems.
Data taking runs were scheduled within the SPS cycle and coordinated with control rooms used by CERN Accelerator operations, with beam conditions monitored by instrumentation groups from CERN BE Department and experiment control software teams using standards developed by CERN IT. Triggering combined multi-level hardware triggers inspired by concepts from CDF and D0 experiments and higher-level software triggers similar to frameworks used at LHCb and ATLAS Tier systems. Busy periods required synchronization with experiments like NA62 planning and involvement of computing centers such as CERN Computing Centre and regional centers in GridPP and INFN CNAF.
The principal goals targeted branching ratios and form factors in decays of the K0_S and hyperons, searches for lepton-flavour violating channels related to efforts by MEG and Mu2e, and precision studies constraining parameters in the CKM matrix and tests of Chiral Perturbation Theory used by theorists at institutions like CERN Theory Division, Institute for Theoretical Physics, University of Cambridge, and Princeton University. Results from NA48/1 contributed to global averages compiled by the Particle Data Group and cross-checked measurements from KTeV, KOTO, and E787. The experiment’s findings informed constraints in phenomenological models developed by groups at SLAC, Fermilab, DESY, and KEK.
Analysis pipelines used simulation tools such as GEANT for detector response, ROOT for histogramming and statistical treatment, and fitting packages similar to those used by CDF and BaBar collaborations. Systematic studies referenced calibration techniques from NA48 and background estimation methods parallel to analyses in KTeV and Belle II prototypes. Statistical interpretations employed approaches advocated by collaborations like Particle Data Group and incorporated likelihood methods used in publications from ATLAS and CMS.
The NA48/1 collaboration comprised universities and laboratories across Europe and beyond, including groups from University of Zurich, ETH Zurich, University of Manchester, INFN, CERN, University of Birmingham, University of Glasgow, University of Liverpool, University of Bristol, King's College London, University of Geneva, Paul Scherrer Institute, and others. Its legacy includes contributions to instrumentation know-how later applied in experiments like NA62, LHCb, and KOTO, methodological advances feeding into frameworks used by ATLAS and CMS, and data that informed global reviews by the Particle Data Group and theory work at institutions such as CERN Theory Division and Perimeter Institute.