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Study of heavy baryons from three-body decays

Arifi, Ahmad Jafar 大阪大学 DOI:10.18910/77474

2020.09.25

概要

In recent years, the interest of heavy hadrons containing heavy quarks has been greatly increased by the current experimental facilities such as LHCb and Belle which are actively reporting discoveries. Many heavy hadrons are newly observed and some of them may be considered as exotics hadrons. Their nature is not yet well-established and under many discussions due to the creation of a light quark-antiquark pair. Among them, the heavy baryon which contain one heavy quark and light quarks could be a suitable place to study the behavior of light quarks inside the heavy quark environment, which is possibly the key to understand the heavy hadrons in general.

In this dissertation, we focus on studying heavy baryons by investigating their three-body decays. Specifically, we investigate the two-pion emission decays of the low-lying 𝚲𝑐 resonances; 𝚲∗ → 𝚲 𝜋𝜋 . The relevant decay processes such as sequential processes going through Σ(∗) in intermediate states and a direct process have been considered in the calculation.
The 𝚲𝑏 bottom baryons are also studied similarly. We employ effective Lagrangians in a non- relativistic framework where the coupling strengths are computed from the quark model.

In heavy baryons, it is known that the orbital excitations between 𝜆 and 𝜌 mode are well separated. By studying the three-body decay of 𝚲∗ (2595) and 𝚲∗ (2625), we show that the decay properties are sensitive to their internal structures. In comparison to the experimental data, both resonances are consistent with the 𝜆-mode excitation. We also show that the direct process is particularly important for 𝚲∗ 2625 , and its presence can be tested by measuring the Dalitz plots.

Furthermore, the three-body decay is also helpful to determine the unknown spin and parity of 𝚲∗ 2765 , which still have a one-star rating in PDG. By performing a similar analysis, we show that the newly observed 𝚲∗ 6072 by LHCb can be an analog state of 𝚲∗ 2765 . Because of that, we arrive at the conclusion that both states may be related to Roper resonances, 𝑁 1440 , namely the radial excitation of baryons. This discovery tells us that they have common properties which are independent of their flavor contents. The flavor independent nature of Roper-like resonances may provide an interesting hint to the dynamics of hadron resonances.

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