T. W. L. Sanford

Observation of double ø-meson production in 100 and 175 GeV π−-Be interactions

Abstract Inclusive oo production has been studied in π−-Be interactions for 100 and 175 GeV incident momentum. An upper limit of 72 nb has been set for σ(π − Be → η c (2980) + X ) s BR (η c → oo) at 175 GeV . At both momenta the number of oo events is larger than expected for uncorrelated o pairs. A narrow width enhancement is observed at Moo≈2100 MeV with a 4 standard deviation significance.

Production and decay properties of D and D∗ mesons in π−Be interactions

Abstract D ∗± , D ± , D 0 , and D 0 production has been observed in π −Be interactions at 120, 175, and 200 GeV. The dependence of the D cross section on transverse and longitudinal momentum is presented. The ratio of D∗ to D and charged to neutral D production is determined. Leading particle effects in D production are investigated. Relative branching ratios for several D decay modes are evaluated. A limit on D 0 − D 0 mixing is given.

Observation of D∗± and production in high-energy π−Be interactions at the SPS

Abstract An experiment has been performed to search for associated hadronic production of charmed mesons, using a large-aperture forward magnetic spectrometer setup in a π− beam at the CERN SPS. A prompt electron trigger was used to select events containing a pair by charmed particles. D mesons have been identified by reconstruction of hadronic decay modes such as Kπ, Kππ. Data have been taken at 120, 175, and 200 GeV, The D D cross section measured at 175 200 GeV is σ( D D ) = (48 ± 15) μ b with a systematic uncertainty of ±50%. The energy dependence of the cross section is measured to be σ( D D ) [120 GeV )/σ( D D [175/200 GeV ] = 0.62 ± 0.34 .

A search for the S(1936) in 100 GeV pBe interactions

Abstract A search for the S(1936) has been made in the invariant mass spectrum of pp-pairs produced inclusively in proton-beryllium interactions at 100 GeV incident momentum. No enhancement is observed, giving a 3 standard deviation upper limit on the cross section of 220 nb/nucleon for production of a narrow pp state around ≈ 1940 MeV in the x F range 0.18 x F

Construction and performance of a small drift chamber with 23 μm spatial resolution

Abstract A pressurized drift chamber is described which measured particle tracks at 10 points. For particles in a beam of low intensity, an accuracy of 23μm per point is obtained. Downstream of a target in a high-intensity beam, events are reconstructed with an accuracy of 30 μm per point.

Inclusive Λ(1,520) production in 100 GeVp Be interactions

AbstractThe reactionpBe→Λ(1,520)X has been measured at 100 GeV incident momentum in the kinematic range 0.15<x<0.35

Inclusive ?-meson production in K - , <img src="/fulltext-image.asp?format=htmlnonpag

(x = 2p_\parallel ^{c.m} /\sqrt s )

Inclusive Lambda(1,520) production in 100 GeV p Be interactions

andPT<1 GeV. The invariant cross section is compatible with that measured forpp interactions at the CERN-ISR. The differential cross sectiondσ/dpT2 is fitted to an exponentiale−αpT2 with α=2.7 GeV−2.