Factorization of heavy-to-light baryonic transitions in SCET

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• 作者：Wei Wang ^{wei.wang@desy.de}
• 关键词：Heavy quark physics ; QCD ; b-physics
• 刊名：Physics Letters B
• 出版年：2012
• 出版时间：14 February 2012
• 年：2012
• 卷：708
• 期：1-2
• 页码：119-126
• 全文大小：232 K

文摘

In the framework of the soft-collinear effective theory, we demonstrate that the leading-power heavy-to-light baryonic form factors at large recoil obey the heavy quark and large energy symmetries. Symmetry breaking effects are suppressed by or , where ¦« is the hadronic scale, is the b quark mass and is the energy of light baryon in the final state. At leading order, the leading power baryonic form factor , in which two hard-collinear gluons are exchanged in the baryon constituents, can factorize into the soft and collinear matrix elements convoluted with a hard-kernel of order . Including the energy release dependence, we derive the scaling law . We also find that this form factor is numerically smaller than the form factor governed by soft processes, although the latter is formally power-suppressed.