J/ψ polarization in p+p collisions at s=

Abstract

We report on a polarization measurement of inclusive J /ψ mesons in the di-electron decay channel at mid-rapidity at 2 < p T < 6 GeV/c in p + p collisions at √ s = 200 GeV. Data were taken with the STAR detector at RHIC. The J /ψ polarization measurement should help to distinguish between different models of the J /ψ production mechanism since they predict different p T dependences of the J /ψ polarization. In this analysis, J /ψ polarization is studied in the helicity frame. The polarization parameter λ θ measured at RHIC becomes smaller towards high p T , indicating more longitudinal J /ψ polarization as p T increases.The result is compared with predictions of presently available models.

Measurements of J/ψ Production and Polarization in p+p and p+Au Collisions at s NN = 200 GeV with the STAR Experiment

“…The new results using 2012 (via di-electron decay channel) and 2015 (via di-muon decay channel) data are consistent in the overlapping region and are consistent with 0 for 0 < p T < 8 GeV/c. Current data are also consistent with previous publication using 2009 data [13][14] , even though the overall trend seems a bit different.…”

Random sequential adsorption of polydisperse mixtures on lattices

“…The shift of the peak to smaller sizes and the broadening of the distribution (here observed for w ≥ 1/4) parallel the features reported by Meakin and Jullien [25] for RSA of disks and by Adamczyk et al [26] for RSA of spheres with Gaussian distributions of incident sizes. Recently, Marques et al [27] studied the RSA of polydisperse disks on patterned substrates, showing adsorbed distributions with a secondary peak in small s at short times and a monotonically decreasing shape at long times.…”

“…RSA of mixtures of spheres and disks with Gaussian size distributions were also studied in Refs. [25][26][27]. Some important conclusions from those works were the increase of the adsorption rate and the shift of the adsorbed particle size distribution peak as the width of the incident distribution increased.…”

Label‐free relative quantification of alpha‐2‐macroglobulin site‐specific core‐fucosylation in pancreatic cancer by LC‐MS/MS

“…One protein may have several glycosylation sites (glycosylation heterogeneity) with multiple possible glycans at each site (glycosylation microheterogeneity). In most glycosylation studies, N-glycans are released from the peptide backbone by peptide N-glycosidase F (PNGase F), followed by separate qualitative and quantitative analysis of glycans [7,8] and deglycosylated peptides [9,10]. This approach provides aggregate glycosylation information, but cannot identify sitespecific glycosylation patterns.…”