xi baryon xi baryon (zī, sī, ksē) either of two subatomic particles in the baryon family, one neutral and one negatively charged, with m-sses of 2,572 and 2,585 times that of the electron and average lifetimes of 2.9 × 10-10 and 1.6 × 10-10 seconds. see table at subatomic particle.
a river in s china, flowing e from yunnan province to the south china sea near canton. 1250 miles (2012 km) long.
a city in and the capital of shaanxi province, in central china: capital of the ancient chinese empire. noun an industrial city in central china, capital of shaanxi province: capital of china for 970 years at various times between the 3rd century bc and the 10th century ad; seat of the northwestern university (1937); famous […]
any of a family of baryons having strangeness −2 and isotopic spin ½. symbol: ξ.
xi-c baryon xi-c baryon either of two subatomic particles in the baryon family, one neutral and one positively charged, with m-sses of 4,826 and 4,834 times that of an electron and average lifetimes of 3.5 × 10-13 and 9.8 × 10-14 seconds, respectively. see table at subatomic particle.