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arXiv 0804.1659hep-phastro-ph
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通过未观测到来自太阳的体矢量玻色子信号对低尺度量子引力理论的约束

Constraining theories of low-scale quantum gravity by non-observation of the bulk vector boson signal from the Sun

R. Horvat, D. Kekez, Z. Krecak, A. Ljubicic

摘要:

在这个实验中,我们的目标是检测卡鲁扎-克莱因(KK)激发的散装规范场,在太阳等离子体成分的韧致辐射过程中发出的,通过看一个类似的过程中的光电效应内的HPGe探测器。使用一个通用的功能的潜在的有效理论,未知的4维规范耦合是独立的额外的大尺寸三角洲的数量,我们表明,在检测器中的事件的预期数量是不敏感的真正规模的量子引力三角洲=2。在1.7 - 3.8 keV能量区间的202天的整个数据收集时间内,检测到的事件数量低至1.1x10^6,而预期的δ =2的太阳KK激发的高多重性为2.7x10^6。因此,我们从与额外规范玻色子相关联的新的力的假定存在的界限实际上符合从各种天体物理考虑设置的非常严格的界限。如果不考虑KK光谱红外部分的任何变化,这个界限将排除在LHC上观测到δ =2的任何信号的可能性。尽管当δ =3时,对4+ δ维引力的基本尺度的依赖性再次打开,但目前装置的实验灵敏度证明不足以对δ>2产生任何约束。

英文摘要:

In this experiment we aim to detect Kaluza-Klein (KK) excitations of the bulk gauge field, emitted in a bremsstrahlung process on solar plasma constituents, by looking at a process analogous to the photoelectric effect inside the HPGe detector. Using a generic feature of the underlying effective theory that the unknown 4-dimensional gauge coupling is independent of the number of extra large dimensions delta, we show that the expected number of events in the detector is insensitive to the true scale of quantum gravity for delta=2. With the entire data collection time of 202 days in the energy interval 1.7 - 3.8 keV, the number of events detected was as low as 1.1x10^6, compared to 2.7x10^6 from the expected high multiplicity of the solar KK excitations for delta =2. Hence, our bound from the presumed existence of new forces associated with additional gauge bosons actually conforms with very stringent bounds set from various astrophysical considerations. Baring any modifications of the infrared part of the KK spectrum, this bound would therefore rule out the possibility of observing any signal at the LHC for delta=2. Although a dependence on the fundamental scale referring to 4+delta-dimensional gravity turns on again for delta=3, the experimental sensitivity of the present setup proves insufficient to draw any constraint for delta>2.

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