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Related Experiment Video

Updated: Jul 11, 2026

Setting Limits on Supersymmetry Using Simplified Models

Setting Limits on Supersymmetry Using Simplified Models

Published on: November 15, 2013

Measurement of the Lambda b lifetime in the exclusive decay Lambda b --> J/psi Lambda.

V M Abazov¹, B Abbott, M Abolins

¹Joint Institute for Nuclear Research, Dubna, Russia.

Physical Review Letters

|October 13, 2007

Summary

This summary is machine-generated.

We measured the Lambda b baryon lifetime using exclusive decays, finding it to be 1.218 picoseconds. This result aids in understanding heavy baryon properties and comparing them to B0 meson lifetimes.

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Area of Science:

Particle Physics
High-Energy Physics
Hadron Spectroscopy

Background:

Understanding the properties of heavy baryons, such as the Lambda b baryon, is crucial for testing the Standard Model of particle physics.
Precise measurements of particle lifetimes provide sensitive probes of fundamental interactions and decay mechanisms.

Purpose of the Study:

To measure the lifetime of the Lambda b baryon using a specific exclusive decay channel.
To compare the measured Lambda b lifetime with the lifetime of the B0 meson to investigate mass-dependent effects in heavy quark systems.

Main Methods:

Analysis of 1.2 fb(-1) of data collected by the D0 detector between 2002 and 2006.
Reconstruction of Lambda b decays via Lambda b --> J/psi Lambda, with J/psi --> mu+ mu- and Lambda --> ppi.
Simultaneous measurement of the B0 meson lifetime using the decay B0 --> J/psi(mu+ mu-)K(0)(S)(pi+ pi-).

Main Results:

The measured Lambda b lifetime is tau(Lambda b) = 1.218 (+0.130)/(-0.115) (stat) +/- 0.042 (syst) picoseconds.
The measured B0 meson lifetime is tau(B0) = 1.501 (+0.078)/(-0.074) (stat) +/- 0.050 (syst) picoseconds.
The ratio of lifetimes is tau(Lambda b)/tau(B0) = 0.811 (+0.096)/(-0.087) (stat) +/- 0.034 (syst).

Conclusions:

The precise measurement of the Lambda b lifetime provides valuable data for theoretical calculations in heavy quark physics.
The obtained lifetime ratio offers insights into the dynamics of heavy meson and baryon decays and potential differences arising from their quark content.