Česky
English
Výbor pro spolupráci ČR se Spojeným ústavem jaderných výzkumů Přihlášení
Measurement of the H-3(Lambda) lifetime in Au plus Au collisions at the BNL Relativistic Heavy Ion Collider

Autor
Adamczyk L. AGH University of Science and Technology, Poland
Lednický Richard, promovaný fyzik DrSc. dr. h. c. Fyzikální ústav AV ČR, SÚJV Dubna
et al.  STAR collaboration

Rok
2018

Časopis
Physical Review C, 97 (5), 054909

Web


Obsah
An improved measurement of the H-3(Lambda) lifetime is presented. In this paper, the mesonic decay modes H-3(Lambda) -> He-3 + pi(-) and H-3(Lambda) -> d + p + pi(-) are used to reconstruct the H-3(Lambda) from Au+Au collision data collected by the STAR collaboration at Relativistic Heavy Ion Collider (RHIC) A minimum chi(2) estimation is used to determine the lifetime tau = 142(+21)(-24 )(stat.)+/- 29 (syst.) ps. This lifetime is about 50% shorter than the lifetime tau = 263 +/- 2 ps of a free A, indicating strong hyperon-nucleon interaction in the hypernucleus system. The branching ratios of the mesonic decay channels are also determined to satisfy B.R.(He-3+ pi(-))/(B.R.(H-3+pi(-))/B.R.((d+p+pi))) = 0.32 +/- 0.05 (stat.)+/- 0.08 (syst.). Our ratio result favors the assignment J(H-3(Lambda)) = 1/2 over J(H-3(Lambda)) = 3/2. These measurements will help to constrain models of hyperon-baryon interactions.

Příklad citace článku:
L. Adamczyk, R. Lednický, . et al., "Measurement of the H-3(Lambda) lifetime in Au plus Au collisions at the BNL Relativistic Heavy Ion Collider", Physical Review C, 97 (5), 054909 (2018)