Measurement of the mass and production rate of Ξ−b baryons; Physical Review D; Vol. 99, iss. 5

Measurement of the mass and production rate of Ξ−b baryons; Physical Review D; Vol. 99, iss. 5

Podrobná bibliografie
Parent link:Physical Review D: particles, fields, gravitation, and cosmology
Vol. 99, iss. 5.— 2019.— [052006, 13 p.]
Korporace: Национальный исследовательский Томский политехнический университет Инженерная школа информационных технологий и робототехники Отделение автоматизации и робототехники (ОАР), Национальный исследовательский Томский политехнический университет Исследовательская школа физики высокоэнергетических процессов
Další autoři: Aaij R. Roel, Beteta C. A. Carlos Abellan, Adeva B. Bernardo, Shapkin M. M. Mikhail Mikhaylovich, Panshin G. L. Gennady Leonidovich, Strokov S. A. Sergey Aleksandrovich
Shrnutí:Title screen
The first measurement of the production rate of Ξ−b baryons in pp collisions relative to that of Λ0b baryons is reported, using data samples collected by the LHCb experiment, and corresponding to integrated luminosities of 1, 2 and 1.6  fb−1 at √s=7, 8 and 13 TeV, respectively. In the kinematic region 2<η<6 and pT<20  GeV/c, we measure fΞ−bfΛ0bB(Ξ−b→J/ψΞ−)B(Λ0b→J/ψΛ)=(10.8±0.9±0.8)×10−2 [√s=7,8  TeV], fΞ−bfΛ0bB(Ξ−b→J/ψΞ−)B(Λ0b→J/ψΛ)=(13.1±1.1±1.0)×10−2 [√s=13  TeV], where fΞ−b and fΛ0b are the fragmentation fractions of b quarks into Ξ−b and Λ0b baryons, respectively; B represents branching fractions; and the uncertainties are due to statistical and experimental systematic sources. The values of fΞ−b/fΛ0b are obtained by invoking SU(3) symmetry in the Ξ−b→J/ψΞ− and Λ0b→J/ψΛ decays. Production asymmetries between Ξ−b and ¯Ξ+b baryons are also reported. The mass of the Ξ−b baryon is also measured relative to that of the Λ0b baryon, from which it is found that m(Ξ−b)=5796.70±0.39±0.15±0.17  MeV/c2, where the last uncertainty is due to the precision on the known Λ0b mass. This result represents the most precise determination of the Ξ−b mass.
Jazyk:angličtina
Vydáno: 2019
Témata:
электронный ресурс
труды учёных ТПУ
On-line přístup:http://earchive.tpu.ru/handle/11683/64806
https://doi.org/10.1103/PhysRevD.99.052006
Médium: MixedMaterials Elektronický zdroj Kapitola
KOHA link:https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=663430

Podobné jednotky

Podobné jednotky