Clas på Hörnet Clas på Hörnet Clas på Hörnet is a hotel and restaurant on Surbrunnsgatan in Vasastan, Stockholm, Sweden, located to the northeast of the Stockholm School of Economics. It was founded by restaurateur Christer von Arnold in 1984. The building itself was originally the Browallshof inn, founded by Clas Browall in 1731. The 18th-century inn is famous in history as it is frequently mentioned in the poetry of Carl Michael Bellman. In 1731, Clas Browall (d. 1742) and his spouse Annika Browall (d. 1749) bought the building called "Hjärpes gård" (Hjärpe farm) for their mutual savings from the inn "Ingemarshof", where
CLAS detector at the center of CLAS. These collisions generally produce new particles, often after the target nucleons (protons and neutrons) are briefly excited to heavier-mass versions of the familiar protons and neutrons. A whole variety of intermediate-mass short-lived particles called "mesons" can be created. Scattered electron as well as the longer-lived produced particles travel through the CLAS detector, where they are measured. Particle physicists use these measurements to deduce the underlying structure of protons and neutrons and to better understand the interactions that create these new particles. The CLAS detector system was operational from 1998 until May 2012. From that time