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THE IMAGINATION. “The neurobiological substrate of the tinkering process could be found in a hierarchical model of the brain characterized by a multiplicity of functional modules (FMs) that can be assembled according to different spatial and temporal scales.” (Fascinating article). https://lnkd.in/dJ8dUGRd View in LinkedIn

ONE EXPLANATION. “Pauli blocking may lead to a flavour asymmetry as the extra u valence quark Pauli blocks some matter-antimatter pairs from forming.” https://www.nature.com/articles/s41586-021-03282-z View in LinkedIn

A DOOR OPENS. “These results are expected to revive interest in several proposed mechanisms for the origin of this antimatter asymmetry in the proton that had been disfavoured by previous results, and point to future measurements that can distinguish between these mechanisms.” https://www.nature.com/articles/s41586-021-03282-z View in LinkedIn

THE PROBLEM. “There are various mechanisms that may account for the antiquark flavour asymmetry of the proton.” https://www.nature.com/articles/s41586-021-03282-z View in LinkedIn

SURPRISE. “Here we provide evidence from muon pair production measurements that these distributions are considerably different, with more abundant down antimatter quarks than up antimatter quarks over a wide range of momenta.” https://www.nature.com/articles/s41586-021-03282-z View in LinkedIn

QUARK-ANTIQUARK COLLISIONS. “One can isolate the antiquark distributions from the Drell–Yan cross-section by making use of this property.” https://www.nature.com/articles/s41586-021-03282-z View in LinkedIn

HUNTING THE SNARK. “In this picture of quark–antiquark creation by the strong force, the probability distributions as a function of momentum for the presence of up and down antimatter quarks should be nearly identical, given that their masses are very similar and small compared to the mass of the proton.” https://www.nature.com/articles/s41586-021-03282-z View in LinkedIn

PARTICLE MENAGERIE. “The Drell–Yan process in hadron–hadron collisions is a reaction in which a quark and an antiquark annihilate into a virtual photon, and that virtual photon decays into a lepton–antilepton pair.” https://www.nature.com/articles/s41586-021-03282-z View in LinkedIn

NEW CARTOON. “In the early 1990s the New Muon Collaboration (NMC) reported measurements of the deep inelastic structure functions (F2) of hydrogen (H) and deuterium (D).” https://www.nature.com/articles/s41586-021-03282-z View in LinkedIn

OLD PICTURE. “Several authors assumed that at some low momentum scale the sea quarks and gluons vanish, and at high momentum scales they are all generated by gluon radiation and then gluon splitting. These assumptions were used to describe successfully the existing data in the late 1970s.” https://www.nature.com/articles/s41586-021-03282-z View in LinkedIn