136 research outputs found
Search for pair production of massive particles decaying into three quarks with the ATLAS detector in root s=7 TeV pp collisions at the LHC
No full textATLAS Collaboration Contributor: P. JacksonA search is conducted for hadronic three-body decays of a new massive coloured particle in √s=7 TeV pp collisions at the LHC using an integrated luminosity of 4.6 fb−1 collected by the ATLAS detector. Supersymmetric gluino pair production in the context of a model with R-parity violation is used as a benchmark scenario. The analysis is divided into two search channels, each optimised separately for their sensitivity to high-mass and low-mass gluino production. The first search channel uses a stringent selection on the transverse momentum of the six leading jets and is performed as a counting experiment. The second search channel focuses on low-mass gluinos produced with a large boost. Large-radius jets are selected and the invariant mass of each of the two leading jets is used as a discriminant between the signal and the background. The results are found to be consistent with Standard Model expectations and limits are set on the allowed gluino mass.The ATLAS collaboratio
THE SLOW POSITION-SENSITIVE TIME-OF-FLIGHT DETECTOR OF THE GAMS NA 12/2 EXPERIMENT OF CERN
No full textA large time-of-flight detector has been built by the GAMS NA12/2 experiment at CERN. It surrounds a 60 cm long liquid hydrogen target. With a time resolution better than sigma = 350 ps, pion/proton separation is achieved up to a 800 MeV/c momentum
OBSERVATION OF THE TENSOR X(1810) MESON IN THE CENTRAL REGION OF PI-N INTERACTIONS AT ENERGY 300 GEV
No full text
Study of the pi(0)pi(0) system in pp central collisions at 450 GeV/c
No full textThe effective mass spectrum of pi(0) pairs produced in pp central collisions (pp --> pf pi(0) pi(0)p(s)) at 450 GeV/c, root s = 29 GeV, below 1 GeV differs from that observed in peripheral charge exchange reactions, In particular, there is a large number of events between pi pi-threshold and 1 GeV, that interfere with f(0)(980) destructively. The possible existence of a broad S-wave state is suggested. (C) 1997 Published by Elsevier Science B.V
GAMS RESULTS ON THE OMEGA-PI(0) SYSTEM
No full textThe first results on the omega-pi-0 system produced in the charge-exchange reaction of pi--p scattering at 38 GeV/c and 100 GeV/c are presented. The omega-pi-0 mass spectrum shows, alongside with the well-known b1(0) (1235) and rho-3(0) (1690) mesons, a new neutral state with mass 2200 +/- 20 MeV and width 260 +/- 50 MeV. This meson, X(2200), is produced like rho-3 through one-pion exchange. X(2200) is a candidate for the 1-- multiplet, and its possible interpretation is a 2(3)D1 excitation of the rho-0. Its production cross section at 3 S GeV/c is equal to sigma(pi--p --> Xn) . BR (X --> omega-pi-0) = 120 +/- 25 nb. Cross sections for b1 and rho-3 have also been measured. The energy dependences have been determined
STUDY OF THE OMEGA-PI(0) SYSTEM AT HIGH MASSES
No full textThe first results are presented on the study of the omega-pi-0 system produced in the charge-exchange reaction of pi-p scattering at the momenta 38 and 100 GeV/c. Together with the well known b1(0) (1235) and rho-3 (1690) mesons, in the mass spectrum of the omega-pi-0 system one observes a new neutral state with mass 2200 +/- 20 MeV and width 260 +/- 50 MeV, produced, like the rho-3, via one-pion exchange. This meson, X(2200), is a candidate for the 1- -multiplet. A possible interpretation is that it is a 2(3)D1 radial excitation of the rho-0 meson. Its production cross section at 38 GeV/c is sigma[pi-p --> X(2200)n]BR[X(2200) --> omega-pi-0] = 120 +/- 25 nb, and it falls off quadratically with increasing energy, which is consistent with one-pion exchange
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