Baryons with two heavy quarks: Masses, production, decays, and detection
Baryons with two heavy quarks: Masses, production, decays, and detection
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DOI：
10.1103/physrevd.90.094007
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发表时间：
2014-08
影响因子：
5
通讯作者：
M. Karliner;J. Rosner
中科院分区：
文献类型：
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作者：
M. Karliner;J. Rosner
LHCb 观察到的大量 B c 介子表明在同一实验中产生双重重子的横截面相当大。受此启发，我们使用一种准确预测单重夸克基态重子质量的方法，估计了双重重子 Ξ c c 、Ξ b b 和 Ξ b c 及其 J = 3 / 2 超精细伙伴的质量。得到M(Ξcc)=3627±12MeV，M(Ξcc*)=3690±12MeV，M(Ξbb)=10162±12MeV，M(Ξbb*)=10184±12MeV，M(Ξbc)=6914±13 MeV，M(Ξ′bc)=6933±12MeV，M(Ξbc*)=6969±14MeV。作为副产品，我们估计 B c * 和 B c 介子之间的超精细分裂为 68 ± 8 MeV。我们讨论 P 波激发、产生机制、衰变模式、寿命和双重重子检测的前景。
The large number of B c mesons observed by LHCb suggests a sizable cross section for producing doubly heavy baryons in the same experiment. Motivated by this, we estimate masses of the doubly heavy J = 1 / 2 baryons Ξ c c , Ξ b b , and Ξ b c , and their J = 3 / 2 hyperfine partners, using a method which accurately predicts the masses of ground-state baryons with a single heavy quark. We obtain M ( Ξ c c ) = 3627 ± 12 MeV , M ( Ξ c c * ) = 3690 ± 12 MeV , M ( Ξ b b ) = 10162 ± 12 MeV , M ( Ξ b b * ) = 10184 ± 12 MeV , M ( Ξ b c ) = 6914 ± 13 MeV , M ( Ξ ′ b c ) = 6933 ± 12 MeV , and M ( Ξ b c * ) = 6969 ± 14 MeV . As a byproduct, we estimate the hyperfine splitting between B c * and B c mesons to be 68 ± 8 MeV . We discuss P-wave excitations, production mechanisms, decay modes, lifetimes, and prospects for detection of the doubly heavy baryons.