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This paper presents results on multiplicity fluctuations of positively and negatively charged hadrons as well as net-electric charge fluctuations measured in central Ar+Sc interactions at beam momenta 13A, 19A, 30A, 40A, 75A, and 150 A GeV/c. The fluctuation analysis is one of the tools to search for the predicted critical point of strongly interacting matter. Results are corrected for the experimental biases and quantified using cumulant ratios. In most instances, multiplicity and net-charge distributions appear narrower than the corresponding Poisson or Skellam distributions. Cumulant ratios are compared with the EPOS1.99 model predictions, which provide a qualitative description that aligns with observations for positively and negatively charged particles. The obtained results are also compared to earlier NA61/SHINE results from inelastic p+p interactions in the same analysis acceptance.

(ProQuest: ... denotes formulae and/or non-USASCII text omitted; see image) Abstract A measurement of the transverse momentum spectra of jets in Pb-Pb collisions at ... = 2.76TeV is reported. Jets are reconstructed from charged particles using the anti-k ^sub T^ jet algorithm with jet resolution parameters R of 0.2 and 0.3 in pseudo-rapidity |[eta]| < 0.5. The transverse momentum p ^sub T^ of charged particles is measured down to 0.15 GeV/c which gives access to the low p ^sub T^ fragments of the jet. Jets found in heavy-ion collisions are corrected event-by-event for average background density and on an inclusive basis (via unfolding) for residual background fluctuations and detector effects. A strong suppression of jet production in central events with respect to peripheral events is observed. The suppression is found to be similar to the suppression of charged hadrons, which suggests that substantial energy is radiated at angles larger than the jet resolution parameter R = 0.3 considered in the analysis. The fragmentation bias introduced by selecting jets with a high p ^sub T^ leading particle, which rejects jets with a soft fragmentation pattern, has a similar effect on the jet yield for central and peripheral events. The ratio of jet spectra with R = 0.2 and R = 0.3 is found to be similar in Pb-Pb and simulated PYTHIA pp events, indicating no strong broadening of the radial jet structure in the reconstructed jets with R < 0.3. [Figure not available: see fulltext.]

This Erratum replaces, due to a discovery of coding mistakes, the following quantities: κ3/κ1 of the h+ − h− distribution presented in Fig. 6 and Table 6, κ4 listed in Table 4, and Ĉ4 presented in Fig. 7 and Table 5. All mentioned figures and tables were updated.

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$$\\pi ^\\pm $$π ± ,$$K^\\pm $$K ± , p and$$\\bar{p}$$p ¯ produced in$$^{40}\\hbox {Ar+}^{45}\\hbox {Sc}$$40 Ar+ 45 Sc collisions at beam momenta of 13 A , 19 A , 30 A , 40 A , 75 A and 150 A  $$\\text{ Ge }\\hspace{-1.00006pt}\\text{ V }\\!/\\!c$$Ge V / c . The analysis uses the 10% most central collisions, where the observed forward energy defines centrality. The energy dependence of the$$K^\\pm $$K ± /$$\\pi ^\\pm $$π ± ratios as well as of inverse slope parameters of the$$K^\\pm $$K ± transverse mass distributions are placed in between those found in inelastic$$p+p$$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 or dynamical models.

This paper reports measurements of two-pion femtoscopic correlations in Be+Be collisions at a beam momentum of 150$$A\\,\\hbox {GeV}\\!/\\!c$$A GeV / c  (energy available in the center-of-mass system for nucleon pair$$\\sqrt{s_{\\text {NN}}} = 16.84$$s 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$$\\alpha $$α is approximately constant as a function of$$m_{\\text {T}}$$m T  , and far from both the Gaussian case of$$\\alpha = 2$$α = 2 or the conjectured value at the critical endpoint,$$\\alpha = 0.5$$α = 0.5 . The radius scale parameter R shows a slight decrease in$$m_{\\text {T}}$$m T  , which can be explained as a signature of transverse flow. Finally, an approximately constant trend of the intercept parameter$$\\lambda $$λ as a function of$$m_{\\text {T}}$$m T  was observed, similar to previous NA44 S + Pb results (obtained with a Gaussian approximation, but unlike RHIC results).

Abstract The yields of$$K^0_S$$K S 0 mesons have been measured in inelastic p+p interactions at incident projectile momenta of 31, 40 and 80 $$\\text {Ge}\\hspace{-1.00006pt}\\text {V}\\!/\\!c$$Ge V / c ($$\\sqrt{s_{NN}}=7.7, 8.8$$s NN = 7.7 , 8.8 and 12.3 $$\\text {Ge}\\hspace{-1.00006pt}\\text {V}$$Ge V , respectively). The data were recorded by the NA61$$/$$/ SHINE spectrometer at the CERN Super Proton Synchrotron and the$$K^0_S$$K S 0 mesons identified via their decays into$$\\pi ^{+} \\pi ^{-}$$π + π - pairs. Double-differential distributions are presented as function of transverse momentum and rapidity. The mean multiplicities of$$K^0_S$$K S 0 mesons were determined to be$$(5.95 \\pm 0.19 (stat) \\pm 0.30 (sys)) \\times 10^{-2}$$( 5.95 ± 0.19 ( s t a t ) ± 0.30 ( s y s ) ) × 10 - 2 at 31 $$\\text {Ge}\\hspace{-1.00006pt}\\text {V}\\!/\\!c$$Ge V / c ,$$(7.61 \\pm 0.13 (stat) \\pm 0.43 (sys)) \\times 10^{-2}$$( 7.61 ± 0.13 ( s t a t ) ± 0.43 ( s y s ) ) × 10 - 2 at 40 $$\\text {Ge}\\hspace{-1.00006pt}\\text {V}\\!/\\!c$$Ge V / c and$$(11.58 \\pm 0.12 (stat) \\pm 0.55 (sys)) \\times 10^{-2}$$( 11.58 ± 0.12 ( s t a t ) ± 0.55 ( s y s ) ) × 10 - 2 at 80 $$\\text {Ge}\\hspace{-1.00006pt}\\text {V}\\!/\\!c$$Ge V / c . The results on$$K^{0}_{S}$$K S 0 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 experiments.

Abstract The critical point of strongly interacting matter is searched for at the CERN SPS by the NA61/SHINE experiment in central⁴⁰40 Ar + ⁴⁵45 Sc collisions at 13 A, 19 A, 30 A, 40 A, and 75 A  GeV/c. The dependence of the second-order scaled factorial moments of proton multiplicity distributions on the number of subdivisions in transverse momentum space is measured. The intermittency analysis uses statistically independent data sets for every subdivision in transverse and cumulative-transverse momentum variables. The results obtained do not indicate the searched intermittent pattern. An upper limit on the fraction of correlated protons and the intermittency index is obtained based on a comparison with the Power-law Model.

Abstract 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$$\\pi ^\\pm $$π ± ,$$K^\\pm $$K ± , p and$$\\bar{p}$$p ¯ produced in$$^{40}\\hbox {Ar+}^{45}\\hbox {Sc}$$40 Ar+ 45 Sc collisions at beam momenta of 13A, 19A, 30A, 40A, 75A and 150A $$\\text{ Ge }\\hspace{-1.00006pt}\\text{ V }\\!/\\!c$$Ge V / c . The analysis uses the 10% most central collisions, where the observed forward energy defines centrality. The energy dependence of the$$K^\\pm $$K ± /$$\\pi ^\\pm $$π ± ratios as well as of inverse slope parameters of the$$K^\\pm $$K ± transverse mass distributions are placed in between those found in inelastic$$p+p$$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 or dynamical models.

Abstract This paper reports measurements of two-pion femtoscopic correlations in Be+Be collisions at a beam momentum of 150A \\hbox GeV\\!{/}{\\!{c}{}{}}{A} GeV / c  (energy available in the center-of-mass system for nucleon pair√s̅_̅(̅\\̅t̅e̅x̅t̅ ̅N̅N̅)̅ = 16.84s 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 exponentα α is approximately constant as a function ofm_(\\text T)m T  , and far from both the Gaussian case ofα = 2α = 2 or the conjectured value at the critical endpoint,α = 0.5α = 0.5 . The radius scale parameter R shows a slight decrease inm_(\\text T)m T  , which can be explained as a signature of transverse flow. Finally, an approximately constant trend of the intercept parameterλ λ as a function ofm_(\\text T)m T  was observed, similar to previous NA44 S + Pb results (obtained with a Gaussian approximation, but unlike RHIC results).

(ProQuest: ... denotes formulae and/or non-USASCII text omitted; see image) The production of the strange and double-strange baryon resonances (..., ...) has been measured at mid-rapidity (... ...) in proton-proton collisions at ... ... 7 TeV with the ALICE detector at the LHC. Transverse momentum spectra for inelastic collisions are compared to QCD-inspired models, which in general underpredict the data. A search for the ... pentaquark, decaying in the ... channel, has been carried out but no evidence is seen.