A dark matter detection experiment, Lux Zepplin (LZ) has seen one event that could be dark matter.
How likely is it that it could just be an extreme outlier of the background?
A new preprint attempts to quantify that better than the original note reporting the detection. The paper doesn't reach a final conclusion which is highly model dependent, but points the way to determining if the LZ event could be just a fluke of ordinary physics rather than a singular dark matter detection, and points the way to how to clarify the matter.
This is mandatory reading for anyone proposing a beyond the Standard Model explanation of this result.
We reconstruct the continuum electron-recoil contribution to the LZ background expectation from the collaboration's released simulation configuration. The released model specifies a definite response tail, but the published calibration information supplies no bound on how far the physical tail may depart from it at the probabilities the expectation depends on.
Distributions reproducing the executable model's mean, variance, and standardised skewness exactly, and its event-conditioned 10, 50, and 90% (N_e) quantiles to about one per cent, differ in the relevant tail probability by more than five orders of magnitude.
The ladder is short: a tail agreeing with that central characterisation to 0.14% in the quantiles lifts the electron-recoil contribution out of the negligible range, and one agreeing to 0.47% makes it comparable to the entire background quoted for the comparison region. We go on to identify the measurements that would settle it.
Triparno Bandyopadhyay, Rajarajeswari Ramasamy, Nishitha TP, "The Electron-Recoil Response Tail and the LZ High-Energy Event Background" arXiv:2610.27105 (October 19, 2026).
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Xujiayao hominins are confirmed to be Denisovans
The proteome of Middle Pleistocene Xujiayao and common Denisovan morphology
Song Xing, Zhongyou Wu, Qingfeng Shao, Junyi Ge, E. Andrew Bennett, Huiyun Rao, Sungui Lin, Yuhao Zhao, Feng Liu, Yichen Liu, Kai Zhou, Xiaotian Feng, Qigao Jiangzuo & Qiaomei Fu
Nature (2026) Cite this article
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Abstract
The taxonomy and phylogeny of late Middle Pleistocene hominins in East Asia remain highly debated1. Xujiayao, a key representative assemblage with many fossils and a clear stratigraphy dating to around 199–138 thousand years ago, has been extensively studied, but its evolutionary position remains uncertain. Here, to clarify this, we analysed Xujiayao material through both palaeoproteomic analysis and morphological comparisons with other East Asian late Middle Pleistocene archaic Homo. Proteomic analysis of two specimens identified 18 endogenous proteins, and the Denisova-specific COL1A2-996 R>K mutation strongly supported their affiliation with the Denisovan lineage. Extended analysis identifies a set of shared morphological traits between Denisovan fossils (Xujiayao and Harbin) and other East Asian late Middle Pleistocene archaic Homo (such as Jinniushan, Dali and Hualongdong), indicating that they all belong to the Denisovan lineage. This analysis provides a comprehensive view of Denisovan features, showing both traits reminiscent of Homo erectus (such as a thick cranial vault) and those characteristic of modern humans (for example, a strongly arched temporal squama). They also share features with late Neanderthals, such as the structure of the temporal labyrinth and the presence of a suprainiac fossa. Notably, Denisovans are distinctive, with a low cranial profile with near-parallel lateral walls, a massive supraorbital torus, a flat zygomaxillary region and weak prognathism.
@neo Huge! Great catch!
thanks so Homo juluensis, are also Denisovans with estimated brain 1700 cc
showing both traits reminiscent of Homo erectus (such as a thick cranial vault) and those characteristic of modern humans (for example, a strongly arched temporal squama)
transitional
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