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Supernova constraints on dark flavored sectors

机译:Supernova在深色调味扇区上的限制

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Proto-neutron stars forming a few seconds after core-collapse supernovae are hot and dense environments where hyperons can be efficiently produced by weak processes. By making use of various state-of-the-art supernova simulations combined with the proper extensions of the equations of state including Λ hyperons, we calculate the cooling of the star induced by the emission of dark particles X 0 through the decay Λ → n X 0 . Comparing this novel energy-loss process to the neutrino cooling of SN 1987A allows us to set a stringent upper limit on the branching fraction, BR ( Λ → n X 0 ) ≤ 8 × 10 ? 9 , that we apply to massless dark photons and axions with flavor-violating couplings to quarks. We find that the new supernova bound can be orders of magnitude stronger than other limits in dark-sector models.
机译:核心崩溃超新星在核心塌陷后形成几秒钟的原始中子恒星是热和密集的环境,其中通过弱过程可以有效地生产超声。 通过使用各种最先进的超新星模拟,与包括λ超谐振的状态方程的适当延伸,通过衰减λ→n计算通过暗粒子x 0的发射引起的星的冷却 x 0。 将该新型能量损耗过程与Sn 1987a的中性冷却进行比较允许我们在分支馏分上设定严格的上限,Br(λ→n×0)≤8×10? 如图9所示,我们适用于无大量的深色光子和带有风味致动联轴器的轴向夸克。 我们发现新的超新星绑定可以比黑暗扇区模型中的其他限制更强的数量级。

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