| Title | Claps | Level | Year | L/Y |
|---|---|---|---|---|
|
Fermi National Accelerator Laboratory FERMILAR-Pub-95 / 035-E CDF Measurement of the W Boson Mass
108 auth. D. Amidei, J. Antes, C. Anway-Wiese, P. Auchincloss, F. Azfar, .. s, P. Azzi, N. Bacchetta, W. Badgett, M. Bailey, s’P. de Barbaro, A. Barbaro-Galtieri, V. Barnes, B. Barnett, P. Bartalini, ...
We present a measurement of the mass of the W boson using data collected with the CDF detector during the 1992-93 collider run at the Fermilab Tevatron. A fit to the transverse mass spectrum of a sample of 3268 W -t pv events recorded in an integrat…
We present a measurement of the mass of the W boson using data collected with the CDF detector during the 1992-93 collider run at the Fermilab Tevatron. A fit to the transverse mass spectrum of a sample of 3268 W -t pv events recorded in an integrated luminosity of 19.7 pb-’ gives a mass df& = 80.310 f 0.205 (stat.) f 0.130 (syst.) GeV/c2. A fit to the transverse mass spectrum of a sample of 5716 W + CY events recorded in 18.2 pb-’ gives a mass M& = 80.490f0.145 (stat.)&0.175 (syst.) GeV/c’. Combining the electron and muon results, accounting for correlated uncertainties, yields a mass MW = 80.410 f 0.180 GeV/c’. PACS numbers: 13.38R, 12.15C, 14.80E The relations between gauge boson mssses and the couplings of gauge bosons sdlow incisive tests of the standard model of the electroweak interactions [l]. The relationships are precisely specified at Born level; higher-order radiative corrections, which are sensitive to the top quark mass, Afttop, and the Riggs boson mass, Mnim, have also been calculated [2]. Measurements of the properties of the 2 boson, as well as measurements in atomic transitions, muon decay, and deep-inelastic scattering, tightly constrain the relationship between allowed v&es of the W mass, Mw, and A&, [3]. Precise measurements of A& and INtop, if inconsistent with the allowed range of predictions, could indicate the existence of new phenomena at or above the electroweak scale. Alternatively, within the confines of the standard model, such measurement8 predict M&w* The measurement of the W mass is unique among electroweak measurements in its sensitivity to charged currents at large momentum transfer. This paper summarizes [4] a measurement of the W mass using W -+ pv and W + Ed decays observed in antiproton-proton (tip) collisions produced at the Fermilab Tewtron with a center-of-mass energy of 1800 GeV. The results are from a data sample with an integrated luminosity of 19.7 pb-‘, collected by the Collider Detector at Fermilab (CDF) during the period from August 1992 to May 1993 [5]. The CDF [6] is an azimuthally and forward-backward symmetric magnetic detector designed to study j$~ collisions at the Tevatron. We briefly describe here those aspects of the detector relevant to this analysis. The magnetic spectrometer consists of tracking devices inside a 3-m diameter, 5-m long superconducting solenoidal magnet which operates at 1.4 T. A four-layer silicon microstrip vertex detector (SVX) [7], located directly outside the beryllium beampipe, is used to provide a precision measurement of the beam axis. Outside the SVX is a set of vertex time projection chambers (VTX), which provides ~-t [S] tracking, used to find the z position of the pp interaction (event vertex). Outside the VTX is the central tracking chamber (CTC), a 3.2-m long drift chamber used to measure the momentum of muons and electrons with up to 84 position measurements per track. The calorimeter is divided into
|
0
|
0 | 1998 |
Social Media Posts