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Rare decays of Lambda b -> Lambda gamma and Lambda b -> Lambda l+l(-) in universal extra-dimension model
Wang YM(王玉明); Lv CD(吕才典); Wang, YM; Aslam, MJ; Lu, CD
2009
发表期刊EUROPEAN PHYSICAL JOURNAL C
卷号59期号:4页码:847-860
通讯作者[Wang, Yu-Ming ; Lu, Cai-Dian] Inst High Energy Phys, Beijing 100049, Peoples R China ; [Wang, Yu-Ming ; Lu, Cai-Dian] CAS, Sci Facil, Ctr Theoret Phys, Beijing 100049, Peoples R China ; [Aslam, M. Jamil] Quaid I Azam Univ, Natl Ctr Phys, Islamabad, Pakistan ; [Aslam, M. Jamil] Natl Univ Sci & Technol, Ctr Adv Math & Phys, Rawalpindi, Pakistan
摘要The exclusive weak decay of Lambda(b) -> Lambda gamma and Lambda(b) -> Lambda l(+)l(-) are investigated in the Appelquist-Cheng- Dobrescu model, which is an extension of the standard model in the presence of universal extra dimensions. Employing the transition form factors obtained in the light-cone sum rules, we analyze how the invariant-mass distribution, the forward-backward asymmetry and the polarization asymmetry of the Lambda baryon of these decay modes can be used to constrain the only additional free parameter with respect to the standard model, namely, the radius, R, of the extra dimension. Our results indicate that the Kaluza-Klein modes can lead to approximately 25% suppression of the branching ratio of Lambda(b) -> Lambda gamma; however, their contributions can bring about 10% enhancement to the decay rate of Lambda(b) -> Lambda l(+)l(-). It is shown that in the present scenario the zero position of the forward-backward asymmetry of Lambda(b) -> Lambda mu(+)mu(-) sensitive to the compactification parameter R, while the measurement of polarizations of Lambda baryon in the Lambda(b) decays are not a useful tool to provide any valuable information for the universal extra-dimension model.
文章类型Article
学科领域Physics
研究领域[WOS]Physics
DOI10.1140/epjc/s10052-008-0835-8
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语种英语
WOS类目Physics, Particles & Fields
WOS记录号WOS:000263508500010
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被引频次:23[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/238599
专题理论物理室
作者单位中国科学院高能物理研究所
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Wang YM,Lv CD,Wang, YM,et al. Rare decays of Lambda b -> Lambda gamma and Lambda b -> Lambda l+l(-) in universal extra-dimension model[J]. EUROPEAN PHYSICAL JOURNAL C,2009,59(4):847-860.
APA 王玉明,吕才典,Wang, YM,Aslam, MJ,&Lu, CD.(2009).Rare decays of Lambda b -> Lambda gamma and Lambda b -> Lambda l+l(-) in universal extra-dimension model.EUROPEAN PHYSICAL JOURNAL C,59(4),847-860.
MLA 王玉明,et al."Rare decays of Lambda b -> Lambda gamma and Lambda b -> Lambda l+l(-) in universal extra-dimension model".EUROPEAN PHYSICAL JOURNAL C 59.4(2009):847-860.
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