Measurement of the total hadronic cross section and determination of gamma-Z interference in e(+)e(-) annihilation

Abstract

The total hadronic cross section in e(+)e(-) annihilation was measured at square root of s = 57.77 GeV to be sigma(sub h) = 143.6 +/- 1.5 (stat) +/- 4.5(sys) pb with only the QED (Quantum Electrodynamics) corrections. The measurement was based on data corresponding to an integrated luminosity of 90.8 pb(exp -1) accumulated by the TOPAZ detector at TRISTAN. The data point put stringent constraints on the size of the gamma-Z(sup 0) interference and the Z(sup 0) mass. Combining the data with the OPAL data at LEP (Large Electron-Positron Collider), the coefficient of the interference and the Z(sup 0) mass to be J(sub had) = 0.10 +/- 0.26 and bar-M(sub z) = 91.151 +/- 0.008 GeV were obtained respectively in a model-independent analysis.

e(+)e(-)消滅における全ハドロン事象断面積を√s=57.77GeVで測定し、QED(量子電磁気学)の補正のみで、σh=143.6±1.5(stat)±4.5(sys)pbを得た。測定は、TRISTANのTOPAZ検出器によって集積した90.8pb{-1}の積分ルミノシティに対応するデータに基づいている。データ点は、γ-Z(0)干渉の大きさとZ{0}質量に厳しい制約をつけた。このデータをLEP(大型電子陽電子衝突装置)におけるOPALのデータと結び付けることにより、それぞれ模型に独立な解析で、干渉係数は、Jhad＝0.10±0.26、Z(0)質量は、Mz=91.151±0.008GeVをそれぞれ得た。