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This book bridges the gap between life sciences and physical sciences by providing several perspectives on cellular and molecular mechanics on a fundamental level. It begins with a general introduction to the scales and terms that are used in the field of cellular and molecular biomechanics and then moves from the molecular scale to the tissue scale. It discusses various tissues or cellular systems through the chapters written by prominent engineers and physicists working in various fields of biomechanics.

Up and down quark structure of the proton

https://doi.org/10.1103/PhysRevD.110.L091101

Abazov, V M; Abbott, B; Acharya, B S; Adams, M; Adams, T; Agnew, J P; Alexeev, G D; Alkhazov, G; Alton, A; Askew, A; et al (November 2024, Physical Review D)

We report an improved measurement of the valence

u

and

d

quark distributions from the forward-backward asymmetry in the Drell-Yan process using

8.6 {fb}^{- 1}

of data collected with the D0 detector in

p \bar{p}

collisions at

\sqrt{s} = 1.96

. This analysis provides the values of new structure parameters that are directly related to the valence up and down quark distributions in the proton. In other experimental results measuring the quark content of the proton,

d

quark contributions are mixed with those from other quark flavors. In this measurement, the

u

and

d

quark contributions are separately extracted by applying a factorization of the QCD and electroweak portions of the forward-backward asymmetry. Published by the American Physical Society2024

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