# Particle physics problem

1. Dec 14, 2007

### neelakash

1. The problem statement, all variables and given/known data

A hadron has the quark content $$\ u$$$$\ d^-$$.Find the baryaon number,charge,spin and strangeness of this hadron.Can you identify this hadron?

2. Relevant equations
3. The attempt at a solution

baryon number=(1/3)+(-1/3)=0 [u is particle but d bar is antiparticle]

charge= +(2/3)+(1/3)= +1 [dbar is the antiparticle of d,whose charge is -(1/3)]

Spin=0 [as the hadron is a meson]

Strangeness= 0

The hadron is a positive pion.

Please check if it is correct.

Last edited: Dec 14, 2007
2. Dec 14, 2007

### Avodyne

You're not given enough info to get the spin. The rho+ has the same quark content and has spin 1.