Physics Experiment Finds No Spin Bias in Particle Collisions
Researchers at CERN's LHCb detector measured the spin orientation of exotic particles created in high-energy collisions and found it remains neutral—a result that challenges some theoretical predictions. The finding constrains models of how matter behaves under extreme conditions, potentially affecting our understanding of fundamental physics relevant to next-generation particle detection technologies.
Originaltitel: Measurement of transverse Λ and Λ<over-bar> hyperon polarization in <em>p</em>Pb collisions at √s<sub>NN</sub>=5.02 TeV
<p>The transverse polarization of Λ and Λ<over bar> hyperons is measured in <em>p</em>Pb collisions collected by the LHCb experiment at a nucleon-nucleon center-of-mass energy of 5.02 TeV. The polarization is averaged over hyperon transverse momentum in the range 0.15 < p<sub>T</sub> < 6.00 GeV/c, and Feynman-x in the ranges 0.005 < x<sub>F</sub> < 0.040 (forward region) and -0.10 < x<sub>F</sub> < -0.01 (backward region) defined relative to the proton beam direction. The transverse polarization is found to be compatible with zero for both Λ and and Λ<over bar> hyperons. The results are also measured as a function of p<sub>T</sub> and x<sub>F</sub> with no significant dependence on these variables observed. The results are compared with previous experimental measurements at different centerof-mass energies and collision environments.</p>