TY - JOUR

T1 - Stau-catalyzed big-bang nucleosynthesis and nuclear cluster model

AU - Kamimura, M.

AU - Kino, Y.

AU - Hiyama, E.

N1 - Funding Information:
The authors would like to thank K. Hamaguchi, T. Hatsuda and T.T. Yanagida for valuable discussions. This work was supported in part by the Grant-in-Aid for Scientific Research from Monbukagakusho of Japan. The numerical calculations were perfomed on the HITACHI SR11000 at KEK.
Copyright:
Copyright 2009 Elsevier B.V., All rights reserved.

PY - 2009/4/30

Y1 - 2009/4/30

N2 - Three-body cluster-model calculations are performed for the new types of big-bang nucleosynthesis (BBN) reactions that are calalyzed by a supersymmetric (SUSY) particle stau, a scalar partner of the tau lepton. If a stau has a lifetime ≳ 103s, it would capture a light element previously synthesized in standard BBN and form a Coulombic bound state. The bound state, an exotic atom, is expected to induce various reactions, such as (αX -) + d → 6Li + X-, in which a negatively charged stau (denoted as X-) works as a catalyzer. Recent literature papers have claimed that some of these stau-catalyzed reactions have significantly large cross sections so that inclusion of the reactions into the BBN network calculation can change drastically abundances of some elements, giving not only a solution to the 6Li-7Li problem (calculated underproduction of 6Li by ∼ 1000 times and overproduction of 7Li+7Be by ∼ 3 times) but also a constraint on the lifetime and the primordial abundance of the elementary particle stau. However, most of these literature calculations of the reaction cross sections were made assuming too naive models or approximations that are unsuitable for those complicated low-energy nuclear reactions. We use a few-body calculational method developed by the authors, and provides precise cross sections and rates of the stau-catalyzed BBN reactions for the use in the BBN network calculation.

AB - Three-body cluster-model calculations are performed for the new types of big-bang nucleosynthesis (BBN) reactions that are calalyzed by a supersymmetric (SUSY) particle stau, a scalar partner of the tau lepton. If a stau has a lifetime ≳ 103s, it would capture a light element previously synthesized in standard BBN and form a Coulombic bound state. The bound state, an exotic atom, is expected to induce various reactions, such as (αX -) + d → 6Li + X-, in which a negatively charged stau (denoted as X-) works as a catalyzer. Recent literature papers have claimed that some of these stau-catalyzed reactions have significantly large cross sections so that inclusion of the reactions into the BBN network calculation can change drastically abundances of some elements, giving not only a solution to the 6Li-7Li problem (calculated underproduction of 6Li by ∼ 1000 times and overproduction of 7Li+7Be by ∼ 3 times) but also a constraint on the lifetime and the primordial abundance of the elementary particle stau. However, most of these literature calculations of the reaction cross sections were made assuming too naive models or approximations that are unsuitable for those complicated low-energy nuclear reactions. We use a few-body calculational method developed by the authors, and provides precise cross sections and rates of the stau-catalyzed BBN reactions for the use in the BBN network calculation.

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U2 - 10.1142/S0217751X09045649

DO - 10.1142/S0217751X09045649

M3 - Article

AN - SCOPUS:67249103742

VL - 24

SP - 2076

EP - 2083

JO - International Journal of Modern Physics A

JF - International Journal of Modern Physics A

SN - 0217-751X

IS - 11

ER -