Measuring the W-Boson mass at a hadron collider: a study of phase-space singularity methods

被引：10

作者：

De Rujula, A. ^{[1
,2
,3
,4
]}

Galindo, A. ^{[2
,5
]}

机构：

[1] Univ Autonoma Madrid, Inst Fis Teor, CSIC, Madrid, Spain

[2] CIMEAT, Madrid, Spain

[3] Boston Univ, Dept Phys, Boston, MA 02215 USA

[4] CERN, Dept Phys, CH-1211 Geneva 23, Switzerland

[5] Univ Complutense, Dept Fis, E-28040 Madrid, Spain

来源：

JOURNAL OF HIGH ENERGY PHYSICS | 2011年 / 08期

关键词：

Hadronic Colliders; Standard Model;

D O I：

10.1007/JHEP08(2011)023

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

The traditional method to measure the W Boson mass at a hadron collider (more precisely, its ratio to the Z boson mass) utilizes the distributions of three variables in events where the W decays into an electron or a muon: the charged lepton transverse momentum, the missing transverse energy and the transverse mass of the lepton pair. We study the putative advantage of the additional measurement of a fourth variable: an improved phase space singularity mass. This variable is statistically optimal, and simultaneously exploits the longitudinal- and transverse-momentum distributions of the charged one unobservable particle, it is fairly nontrivial and constitutes a good "training" example for the scrutiny of phenomena involving invisible objects. Our graphical analysis of the phase space is akin to that of a Dalitz plot, extended to such processes.

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