Tag: Kinematics
LHCb measurements match expectations for B+ decay angular rates
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What the study found The measured normalised decay rate of B+ → J/ψ(→ μ+ μ−)K+ as a function of the lepton helicity angle agrees with expectations. The study also reports that the LHCb Upgrade I detector response is understood to the precision needed for related measurements. Why the authors say this matters The authors conclude…
Particle decays can act as weak quantum spin measurements
What the study found High-energy particle decays can realise informationally weak measurements of quantum spin, according to the authors. The abstract says decay kinematics act as continuous pointer variables with overlapping angular distributions that encode partial, non-projective information about the parent spin state. Why the authors say this matters The authors say this framework links…
Milky Way circular velocity measured from stellar abundances
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in AstrophysicsA new data-driven method measures the Milky Way’s circular velocity using element abundance gradients, deriving rotation parameters at the solar radius.
Tomographic line analysis identifies possible embedded planets in disks
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in AstrophysicsTomographic analysis of molecular line observations enables detection of embedded planets in protoplanetary disks, revealing multiple planet candidates in HD 135344B and MWC 758.
Large protoplanetary disks show widespread non-Keplerian gas motions
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in AstrophysicsTwo-dimensional kinematic mapping of 15 protoplanetary disks reveals ubiquitous non-Keplerian deviations including spiral structures, with systematic differences between disk classifications.
Rear seat intrusion can intensify thoracic injury in rear impacts
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in EngineeringCase and crash-test analysis showing underride-driven rear seat pan contacting the rearward-rotating front seatback produced bottoming-out impulses that substantially amplified thoracic loading.
