The observation of the bottom, strange baryon Xi(0)(b) through the decay chain Xi(0)(b) -> Xi(+)(c)pi(-), where Xi(+)(c) -> Xi(-) pi(+) pi(+), Xi(-) -> Lambda pi(-), and Lambda -> p pi(-), is reported by using data corresponding to an integrated luminosity of 4.2 fb(-1) from p (p) over bar collisions at root s = 1.96 TeV recorded with the Collider Detector at Fermilab. A signal of 25.3(-5.4)(+5.6) candidates is observed whose probability of arising from a background fluctuation is 3.6 x 10(-12), corresponding to 6.8 Gaussian standard deviations. The Xi(0)(b) mass is measured to be (5787.8 +/- 5.0(stat) +/- 1.3(syst)) MeV/c(2). In addition, the Xi(-)(b) baryon is observed through the process Xi(-)(b) -> Xi(0)(c)pi(-), where Xi(0)(c) -> Xi(-) pi(+), Xi(-) -> Lambda pi(-), and Lambda -> p pi(-).

Observation of the Ξ⁰b Baryon

CIOCCI, MARIA AGNESE;M. Dell’Orso;DONATI, SIMONE;PUNZI, GIOVANNI;F. Ruffini;
2011-01-01

Abstract

The observation of the bottom, strange baryon Xi(0)(b) through the decay chain Xi(0)(b) -> Xi(+)(c)pi(-), where Xi(+)(c) -> Xi(-) pi(+) pi(+), Xi(-) -> Lambda pi(-), and Lambda -> p pi(-), is reported by using data corresponding to an integrated luminosity of 4.2 fb(-1) from p (p) over bar collisions at root s = 1.96 TeV recorded with the Collider Detector at Fermilab. A signal of 25.3(-5.4)(+5.6) candidates is observed whose probability of arising from a background fluctuation is 3.6 x 10(-12), corresponding to 6.8 Gaussian standard deviations. The Xi(0)(b) mass is measured to be (5787.8 +/- 5.0(stat) +/- 1.3(syst)) MeV/c(2). In addition, the Xi(-)(b) baryon is observed through the process Xi(-)(b) -> Xi(0)(c)pi(-), where Xi(0)(c) -> Xi(-) pi(+), Xi(-) -> Lambda pi(-), and Lambda -> p pi(-).
2011
T., Aaltonen; B., Álvarez González; S., Amerio; D., Amidei; A., Anastassov; A., Annovi; J., Antos; G., Apollinari; J., Appel; A., Apresyan; T., Arisaw...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/828531
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