Production of K∗(892)0 and ϕ(1020) in pp collisions at $\sqrt{s}=7\ \mathrm{TeV}$

Abstract

The production of K * (892) 0 and φ(1020) in pp collisions at √ s = 7 TeV was measured by the AL-ICE experiment at the LHC. The yields and the transverse momentum spectra d 2 N/dydp T at midrapidity |y| < 0.5 in the range 0 < p T < 6 GeV/c for K * (892) 0 and 0.4 < p T < 6 GeV/c for φ(1020) are reported and compared to model predictions. Using the yield of pions, kaons, and baryons measured previously by ALICE at √ s = 7 TeV, the ratiosThe values of the K * /K − , φ/K * and φ/K − ratios are similar to those found at lower centre-of-mass energies. In contrast, the φ/π − ratio, which has been observed to increase with energy, seems to saturate above 200 GeV. The ( + )/φ ratio in the p T range 1-5 GeV/c is found to be in good agreement with the prediction of the HIJING/BB v2.0 model with a strong colour field.

Fractal Structure of Hadrons: Experimental and Theoretical Signatures

“…All the results approach Hagedorn's results as q → 1. The resulting values for q and T support the above findings of a constant temperature and entropic index, regardless of the collision energy (as long as it is above approximately 1 TeV) or the particle species [44][45][46][47][48][49][50][51][52][53][54][55][56][57].…”

K*(892)0andϕ(1020)production in Pb-Pb collisions atAbelev1, Adam2, Adamová3 et al. 2015Phys. Rev. CSelf Cite

“…This table also includes the ratios o f p T-integrated particle yields K*()/K ~ and c/)/K~, w hich are calculated using the dN /dy values for K~ from [34], T hese ratios are show n in Fig. 6 for Pb-Pb collisions at J s NN -2.76 TeV and pp collisions at yfs = 7 TeV [54,55]. T hese ratios are presented as a function o f (dNch/dri)'/3 (the cube root o f the charged-particle m ultiplicity density m easured at m id-rapidity) [31,53] for reasons discussed below.…”

“…The K*°/K~ ratio is compared in Figs. 7(a) and 7(b) to results for different collision systems at RHIC5 [36,50,60,69] and LHC [34,54,55] energies. The K*°/K~ ratio is plotted as function of (dNch /dp)l/3 [31.53.68.69] in panel (a).…”

“…7(c) and 7(d) to results for different collision systems at SPS [52,62,63], RHIC [46,51,61,[64][65][66], and LHC [43,54,55,67] energies. The (p/K~ ratio is plotted as a function of (dNch /dp)]/3 [31.53.68.69] in panel (c) for collisions at JsN N = 200 GeV and LHC energies.…”

New feature of low $$p_{T}$$ p T charm quark hadronization in pp collisions at $$\sqrt{s}=7$$

“…The data of light-flavor hadrons for dN /d p T dy, e.g. K (892) * , show this behavior more clearly [50]. As a naive illustration, we see the first data point of Ξ 0 c at p T = 1.5 GeV/c is more than twice the exponential extrapolation from data points of larger p T , the thin dashed line, which is not the case for the data of D mesons and Λ + c .…”