NA61/SHINE L\'evy HBT Measurements in Be+Be Collisions at 150AA GeV/c

The program of NA61/SHINE allows for the investigation of the phase diagram of strongly interacting matter. The nature of the quark-hadron transition can be studied through analyzing the space-time structure of the hadron emission source via the measurement of Bose-Einstein momentum correlations. These can be described by correlation functions based on Levy-distributed sources. This report presents the performance plots of Bose-Einstein correlation analysis in Be+Be collisions at 150A GeV/c beam momentum. The transverse mass dependence of the Levy source parameters and their possible interpretations are discussed.Comment: 6 pages, 3 figures, proceedings of the XIII Workshop on Particle Correlations and Femtoscopy (WPCF 2018), Cracow, Poland, May 22-26, 2018, submitted to Acta Physica Polonica

Measurements of π+\pi^+, π−\pi^-, pp, pˉ\bar{p}, K+K^+ and K−K^- production in 120 GeV/cc p + C interactions

This paper presents multiplicity measurements of charged hadrons produced in 120 GeV/$c$ proton-carbon interactions. The measurements were made using data collected at the NA61/SHINE experiment during two different data-taking periods, with increased phase space coverage in the second configuration due to the addition of new subdetectors. Particle identification via $dE/dx$ was employed to obtain double-differential production multiplicities of $\pi^+$, $\pi^-$, $p$, $\bar{p}$, $K^+$ and $K^-$. These measurements are presented as a function of laboratory momentum in intervals of laboratory polar angle covering the range from 0 to 450 mrad. They provide crucial inputs for current and future long-baseline neutrino experiments, where they are used to estimate the initial neutrino flux

Measurements of π±\pi^\pm, K±K^\pm, pp and pˉ\bar{p} spectra in 40^{40}Ar+45^{45}Sc collisions at 13AA to 150AA GeV/cc

The NA61/SHINE experiment at the CERN Super Proton Synchrotron studies the onset of deconfinement in strongly interacting matter through a beam energy scan of particle production in collisions of nuclei of varied sizes. This paper presents results on inclusive double-differential spectra, transverse momentum and rapidity distributions and mean multiplicities of $\pi^\pm$, $K^\pm$, $p$ and $\bar{p}$ produced in $^{40}$Ar+$^{45}$Sc collisions at beam momenta of 13$A$, 19$A$, 30$A$, 40$A$, 75$A$ and 150$A$ GeV/$c$. The analysis uses the 10% most central collisions, where the observed forward energy defines centrality. The energy dependence of the $K^\pm$/$\pi^\pm$ ratios as well as of inverse slope parameters of the $K^\pm$ transverse mass distributions are placed in between those found in inelastic $p$+$p$ and central Pb+Pb collisions. The results obtained here establish a system-size dependence of hadron production properties that so far cannot be explained either within statistical (SMES, HRG) or dynamical (EPOS, UrQMD, PHSD, SMASH) models

Two-pion femtoscopic correlations in Be+Be collisions at sNN=16.84\sqrt{s_{\text {NN}}} = 16.84 GeV measured by the NA61/SHINE at CERN

This paper reports measurements of two-pion femtoscopic correlations in Be+Be collisions at a beam momentum of 150A GeV/c (energy available in the center- of-mass system for nucleon pair $\sqrt{s_{\text {NN}}} = 16.84$ GeV) by the NA61/SHINE experiment at the CERN SPS accelerator. The obtained momentum space correlation functions can be well described by a Lévy distributed source model. The transverse mass dependence of the Lévy source parameters is presented, and their possible theoretical interpretations are discussed. The results show that the Lévy exponent α is approximately constant as a function of mT , and far from both the Gaussian case of α = 2 or the conjectured value at the critical end- point, α = 0.5. The radius scale parameter R shows a slight decrease in $m_T$ , which can be explained as a signature of transverse flow. Finally, an approximately constant trend of the intercept parameter λ as a function of $m_T$ was observed, similar to previous NA44 S + Pb results (obtained with a Gaussian approximation, but unlike RHIC results)

Measurements of π+^{+} , π−^{−} , p , pˉ\bar{p} , K+^{+} and K−^{−} production in 120 GeV / c p + C interactions

This paper presents multiplicity measurements of charged hadrons produced in 120  GeV/c proton-carbon interactions. The measurements were made using data collected at the NA61/SHINE experiment during two different data-taking periods, with increased phase space coverage in the second configuration due to the addition of new subdetectors. Particle identification via dE/dx was employed to obtain double-differential production multiplicities of π+, π−, p, ¯p, K+, and K−. These measurements are presented as a function of laboratory momentum in intervals of laboratory polar angle covering the range from 0 to 450 mrad. They provide crucial inputs for current and future long-baseline neutrino experiments, where they are used to estimate the initial neutrino flux

Search for the critical point of strongly-interacting matter in 40^{40}Ar + 45^{45}Sc collisions at 150A Ge V /c using scaled factorial moments of protons

The critical point of dense, strongly interacting matter is searched for at the CERN SPS in $^{40}$Ar + $^{45}$Sc collisions at 150A Ge V /c. The dependence of second-order scaled factorial moments of proton multiplicity distribution on the number of subdivisions of transverse momentum space is measured. The intermittency analysis is performed using both transverse momentum and cumulative transverse momentum. For the first time, statistically independent data sets are used for each subdivision number. The obtained results do not indicate any statistically significant intermittency pattern. An upper limit on the fraction of correlated proton pairs and the power of the correlation function is obtained based on a comparison with the Power-law Model developed for this purpose

KS0K^0_S meson production in inelastic p+p interactions at 31, 40 and 80 GeV ⁣/ ⁣c\text {Ge}\hspace{-1.00006pt}\text {V}\!/\!c beam momentum measured by NA61//SHINE at the CERN SPS

The yields of $K^0_S$ mesons have been measured in inelastic p+p interactions at incident projectile momenta of 31, 40 and 80 GeV/c (√s N N = 7.7, 8.8 and 12.3 GeV, respectively). The data were recorded by the NA61/SHINE spectrometer at the CERN Super Proton Synchrotron and the $K^0_S$ mesons identified via their decays into π+π− pairs. Double-differential distributions are presented as function of transverse momentum and rapidity. The mean multiplicities of $K^0_S$ mesons were determined to be (5.95 ± 0.19(stat) ± 0.30(sys)) × 10−2 at 31 GeV/c, (7.61 ± .13(stat) ± 0.43(sys)) × 10−2 at 40 GeV/c and (11.58 ± 0.12(stat) ± 0.55(sys))×10−2 at 80 GeV/c. The results on $K^0_S$ production are compared with the production of charged kaons in corresponding reactions and with model calculations (Epos1.99, SMASH 2.0 and PHSD) as well as with published data from other experiment