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arXiv 0902.2176hep-ex
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寻找Y(3S)-> gamma辐射跃迁中光标量的Dimuon衰变A0

Search for Dimuon Decays of a Light Scalar in Radiative Transitions Y(3S) -> gamma A0

The BABAR Collaboration, B. Aubert

摘要:

质量的基本性质是物理学中最大的谜团之一。希格斯机制在理论上是一种很有吸引力的方法来解释基本粒子的不同质量,并暗示着一种新的、尚未被发现的粒子--希格斯玻色子玻色子的存在。我们在Y(3S)窄共振辐射衰变中寻找光标量(例如希格斯玻色子)的证据:Y(3S)->gamma A0,A0->mu+mu-。这样的物体出现在标准模型的扩展中,在标准模型中,一个轻的CP奇希格斯玻色子玻色子自然地与b夸克强烈耦合。我们在BABAR合作组在PEP-II B工厂收集的122*10^6 Y(3S)衰变样本中没有发现这种过程的证据,并将90% C. L.在0.212 ≤ m(A0)≤ 9.3 GeV的质量范围内,分支分数乘积B(Y(3S)-> γ A0)*B(A0->mu+mu-)的上限为(0.25-5.2)*10^{-6}。在90% C. L时,我们还限定了eta_b介子B(eta_b->mu+mu-)的双μ子分支分数<0.8%.结果是初步的。

英文摘要:

The fundamental nature of mass is one of the greatest mysteries in physics. The Higgs mechanism is a theoretically appealing way to account for the different masses of elementary particles and implies the existence of a new, yet unseen particle, the Higgs boson. We search for evidence of a light scalar (e.g. a Higgs boson) in the radiative decays of the narrow Y(3S) resonance: Y(3S)->gamma A0, A0->mu+mu-. Such an object appears in extensions of the Standard Model, where a light CP-odd Higgs boson naturally couples strongly to b-quarks. We find no evidence for such processes in a sample of 122*10^6 Y(3S) decays collected by the BABAR collaboration at the PEP-II B-factory, and set 90% C.L. upper limits on the branching fraction product B(Y(3S)-> gamma A0)*B(A0->mu+mu-) at (0.25-5.2)*10^{-6} in the mass range 0.212<= m(A0)<=9.3 GeV. We also set a limit on the dimuon branching fraction of the eta_b meson B(eta_b->mu+mu-)<0.8% at 90% C.L. The results are preliminary.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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