Showing 10 of 66 results
Elliptic flow (v_2) values for identified particles at midrapidity in Au + Au collisions measured by the STAR experiment in the Beam Energy Scan at the Relativistic Heavy Ion Collider at sqrt{s_{NN}}= 7.7--62.4 GeV are presented for three centrality classes. The centrality dependence and the data at sqrt{s_{NN}}= 14.5 GeV are new. Except at the lowest beam energies we observe a similar relative v_2 baryon-meson splitting for all centrality classes which is in agreement within 15% with the number-of-constituent quark scaling. The larger v_2 for most particles relative to antiparticles, already observed for minimum bias collisions, shows a clear centrality dependence, with the largest difference for the most central collisions. Also, the results are compared with A Multiphase Transport Model and fit with a Blast Wave model.
The difference in $v_{2}$ between particles (X) and their corresponding antiparticles $\bar{X}$ (see legend) as a function of $\sqrt{s_{NN}}$ for 10%-40% central Au + Au collisions. The systematic errors are shown by the hooked error bars. The dashed lines in the plot are fits with a power-law function.
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The difference in $v_{2}$ between protons and antiprotons as a function of $\sqrt{s_{NN}}$ for 0%-10%, 10%-40% and 40%-80% central Au + Au collisions. The systematic errors are shown by the hooked error bars. The dashed lines in the plot are fits with a power-law function.
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The relative difference. The systematic errors are shown by the hooked error bars. The dashed lines in the plot are fits with a power-law function.
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The $v_{2}$ difference between protons and antiprotons (and between $\pi^{+}$ and $pi^{-}$) for 10%-40% centrality Au+Au collisions at 7.7, 11.5, 14.5, and 19.6 GeV. The $v_{2}{BBC} results were slightly shifted horizontally.
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A search for the quantum chromodynamics (QCD) critical point was performed by the STAR experiment at the Relativistic Heavy Ion Collider, using dynamical fluctuations of unlike particle pairs. Heavy-ion collisions were studied over a large range of collision energies with homogeneous acceptance and excellent particle identification, covering a significant range in the QCD phase diagram where a critical point may be located. Dynamical $K\pi$, $p\pi$, and $Kp$ fluctuations as measured by the STAR experiment in central 0-5\% Au+Au collisions from center-of-mass collision energies $\rm \sqrt{s_{NN}}$ = 7.7 to 200 GeV are presented. The observable $\rm \nu_{dyn}$ was used to quantify the magnitude of the dynamical fluctuations in event-by-event measurements of the $K\pi$, $p\pi$, and $Kp$ pairs. The energy dependences of these fluctuations from central 0-5\% Au+Au collisions all demonstrate a smooth evolution with collision energy.
$p\pi$, Kp, and $K\pi$ fluctuations as a function of collision energy, expressed as $v_{dyn,p\pi}$, $v_{dyn,Kp}$, and $v_{dyn,K\pi}$ respectively. Shown are data from central (0-5%) Au+Au collisions at energies from $\sqrt{s_{\rm NN}}$ = 7.7 to 200 GeV from the STAR experiment.
Results on charged pion and kaon production in central Pb+Pb collisions at 20A and 30A GeV are presented and compared to data at lower and higher energies. A rapid change of the energy dependence is observed around 30A GeV for the yields of pions and kaons as well as for the shape of the transverse mass spectra. The change is compatible with the prediction that the threshold for production of a state of deconfined matter at the early stage of the collisions is located at low SPS energies.
Transverse mass spectra for pion production in the central rapidity region for collisions at 20 GeV per nucleon.
Transverse mass spectra for pion production in the central rapidity region for collisions at 30 GeV per nucleon.
Transverse mass spectra for kaon production in the central rapidity region for collisions at 20 GeV per nucleon.
Transverse mass spectra for kaon production in the central rapidity region for collisions at 20 GeV per nucleon.
Transverse mass spectra for kaon production in the central rapidity region for collisions at 30 GeV per nucleon.
Rapidity distribution of PI- production.
Rapidity distribution of K- production.
Rapidity distribution of K+ production.
Energy dependence of the mean K+ to PI+ and K- to PI- multiplicity ratio with the full phase space.. The data below 6 GeV are from the AGS and above 100 GeV from RHIC.
Energy dependence of the mean K+ to PI+ and K- to PI- multiplicity ratio mid rapidity regions.. The data below 6 GeV are from the AGS and above 100 GeV from RHIC.
Energy dependence of the inverse slope parameter of the transverse mass spectra in K+ and K- production.. The data below 6 GeV are from the AGS and above 100 GeV from RHIC.
Energy dependence of the mean transverse mass measured at mid rapidity in PI+ and PI- production.. The data below 6 GeV are from the AGS and above 100 GeV from RHIC.
Energy dependence of the mean transverse mass measured at mid rapidity in K+ and K- production.. The data below 6 GeV are from the AGS and above 100 GeV from RHIC.
The production of the neutral strange hadrons $K^{0}_{S}$, $\Lambda$ and $\bar{\Lambda}$ has been measured in $ep$ collisions at HERA using the ZEUS detector. Cross sections, baryon-to-meson ratios, relative yields of strange and charged light hadrons, $\Lambda$ ($\bar{\Lambda}$) asymmetry and polarization have been measured in three kinematic regions: $Q^2 > 25 \gev^2$: $5 < Q^2 < 25 \gev^2$: and in photoproduction ($Q^2 \simeq 0$). In photoproduction the presence of two hadronic jets, each with at least $5 \gev$ transverse energy, was required. The measurements agree in general with Monte Carlo models and are consistent with measurements made at $e^+ e^-$ colliders, except for an enhancement of baryon relative to meson production in photoproduction.
Differential K0S cross section in DIS events as a function of transverse momentum (lab). for Q**2 from 5 to 25 GeV**2.
Differential K0S cross section in DIS events as a function of transverse momentum (lab). for Q**2 > 25 GeV**2.
Differential K0S cross section in DIS events as a function of pseudorapidity (lab). for Q**2 from 5 to 25 GeV**2.
Differential K0S cross section in DIS events as a function of pseudorapidity (lab). for Q**2 > 25 GeV**2.
Differential K0S cross section in DIS events as a function of Bjorken X. for Q**2 from 5 to 25 GeV**2.
Differential K0S cross section in DIS events as a function of Bjorken X. for Q**2 > 25 GeV**2.
Differential K0S cross section in DIS events as a function of Q**2. for Q**2 > 5 GeV**2.
Differential LAMBDA/LAMBDABAR cross section in DIS events as a function of transverse momentum (lab). for Q**2 from 5 to 25 GeV**2.
Differential LAMBDA/LAMBDABAR cross section in DIS events as a function of transverse momentum (lab). for Q**2 > 25 GeV**2.
Differential LAMBDA/LAMBDABAR cross section in DIS events as a function of pseudorapidity (lab). for Q**2 from 5 to 25 GeV**2.
Differential LAMBDA/LAMBDABAR cross section in DIS events as a function of pseudorapidity (lab). for Q**2 > 25 GeV**2.
Differential LAMBDA/LAMBDABAR cross section in DIS eventsas a function of Bjorken X. for Q**2 from 5 to 25 GeV**2.
Differential LAMBDA/LAMBDABAR cross section in DIS eventsas a function of Bjorken X. for Q**2 > 25 GeV**2.
Differential LAMBDA/LAMBDABAR cross section in DIS events as a function of Q**2. for Q**2 > 5 GeV**2.
Differential K0S cross section in photoproduction events as a function of transverse momentum (lab).
Differential K0S cross section in photoproduction events as a function of pseudorapidity (lab).
Differential K0S cross section in photoproduction events as a function of XOBS(C=GAMMA).
Differential LAMBDA/LAMBDABAR cross section in photoproduction events as a function of transverse momentum (lab).
Differential LAMBDA/LAMBDABAR cross section in photoproduction events as a function of pseudorapidity (lab).
Differential LAMBDA/LAMBDABAR cross section in photoproduction events as a function of XOBS(C=GAMMA).
Asymmetry in LAMBDA/LAMBDABAR production in DIS events as a function of transverse momentum (lab). for Q**2 > 25 GeV**2.
Asymmetry in LAMBDA/LAMBDABAR production in DIS events as a function of pseudorapidity (lab). for Q**2 > 25 GeV**2.
Asymmetry in LAMBDA/LAMBDABAR production in DIS events as a function of Bjorken X. for Q**2 > 25 GeV**2.
Asymmetry in LAMBDA/LAMBDABAR production in DIS events as a function of Q**2. for Q**2 > 25 GeV**2.
Asymmetry in LAMBDA/LAMBDABAR production in photoproduction events as a function of transverse momentum (lab).
Asymmetry in LAMBDA/LAMBDABAR production in photoproduction events as a function of pseudorapidity (lab).
Asymmetry in LAMBDA/LAMBDABAR production in photoproduction events as a function of XOBS(C=GAMMA).
LAMBDA/K0S production ratio in DIS events as a function of transverse momentum (lab). for Q**2 from 5 to 25 GeV**2.
LAMBDA/K0S production ratio in DIS events as a function of transverse momentum (lab). for Q**2 > 25 GeV**2.
LAMBDA/K0S production ratio in DIS events as a function of pseudorapidity (lab). for Q**2 from 5 to 25 GeV**2.
LAMBDA/K0S production ratio in DIS events as a function of pseudorapidity (lab). for Q**2 > 25 GeV**2.
LAMBDA/K0S production ratio in DIS events as a function of Bjorken X. for Q**2 from 5 to 25 GeV**2.
LAMBDA/K0S production ratio in DIS events as a function of Bjorken X. for Q**2 > 25 GeV**2.
LAMBDA/K0S production ratio in DIS events as a function of Q**2. for Q**2 > 5 GeV**2.
LAMBDA/K0S production ratio in DIS events as a function of Q**2. for Bjorken X from 2.0E-5 to 3.0E-4.
LAMBDA/K0S production ratio in DIS events as a function of Q**2. for Bjorken X from 3.0E-4 to 6.0E-4.
LAMBDA/K0S production ratio in DIS events as a function of Q**2. for Bjorken X from 6.0E-4 to 1.4E-3.
LAMBDA/K0S production ratio in DIS events as a function of Q**2. for Bjorken X from 1.4E-3 to 2.0E-2.
LAMBDA/K0S production ratio in DIS events as a function of Bjorken X. for Q**2 from 5.0 to 9.5 GeV**2.
LAMBDA/K0S production ratio in DIS events as a function of Bjorken X. for Q**2 from 9.5 to 25.0 GeV**2.
LAMBDA/K0S production ratio in DIS events as a function of Bjorken X. for Q**2 from 25 to 100 GeV**2.
LAMBDA/K0S production ratio in DIS events as a function of Bjorken X. for Q**2 from 100 to 500 GeV**2.
LAMBDA/K0S production ratio in photoproduction events as a function of transverse momentum (lab).
LAMBDA/K0S production ratio in photoproduction events as a function of pseudorapidity (lab).
LAMBDA/K0S production ratio in photoproduction events as a function of XOBS(C=GAMMA).
LAMBDA/K0S production ratio in photoproduction events as a function of transverse momentum (lab). for data from the fireball-enriched sample where the highest energy jet contributes no more than 30% to the total energy.
LAMBDA/K0S production ratio in photoproduction events as a function of transverse momentum (lab). for data from the fireball-depleted sample where the highest energy jet contributes at least 30% to the total energy.
LAMBDA/K0S production ratio in photoproduction events as a function of pseudorapidity (lab). for data from the fireball-enriched sample where the highest energy jet contributes no more than 30% to the total energy.
LAMBDA/K0S production ratio in photoproduction events as a function of pseudorapidity (lab). for data from the fireball-depleted sample where the highest energy jet contributes at least 30% to the total energy.
LAMBDA/K0S production ratio in photoproduction events as a function of XOBS(C=GAMMA). for data from the fireball-enriched sample where the highest energy jet contributes no more than 30% to the total energy.
LAMBDA/K0S production ratio in photoproduction events as a function of XOBS(C=GAMMA). for data from the fireball-depleted sample where the highest energy jet contributes at least 30% to the total energy.
K0S/Charged particle production ratio in DIS events as a function of transverse momentum (lab). for Q**2 > 25 GeV**2.
K0S/Charged particle production ratio in DIS events as a function of pseudorapidity (lab). for Q**2 > 25 GeV**2.
K0S/Charged particle production ratio in photoproduction events as a function of transverse momentum (lab).
K0S/Charged particle production ratio in photoproduction events as a function of pseudorapidity (lab).
K0S/Charged particle production ratio in photoproduction events as a function of transverse momentum (lab). for data from the fireball-enriched sample where the highest energy jet contributes no more than 30% to the total energy.
K0S/Charged particle production ratio in photoproduction events as a function of transverse momentum (lab). for data from the fireball-depleted sample where the highest energy jet contributes at least 30% to the total energy.
K0S/Charged particle production ratio in photoproduction events as a function of pseudorapidity (lab). for data from the fireball-enriched sample where the highest energy jet contributes no more than 30% to the total energy.
K0S/Charged particle production ratio in photoproduction events as a function of pseudorapidity (lab). for data from the fireball-depleted sample where the highest energy jet contributes at least 30% to the total energy.
Using data from Fermilab fixed-target experiment E769, we have measured particle-antiparticle production asymmetries for Lambda0 hyperons in 250 GeV/c pi+-, K+- and p -- nucleon interactions. The asymmetries are measured as functions of Feynman-x (x_F) and p_t^2 over the ranges -0.12<=x_F<=0.12 and 0<=p_t^2<=3 (GeV/c)^2 (for positive beam) and -0.12<=x_F<=0.4 and 0<=p_t^2<=10 (GeV/c)^2 (for negative beam). We find substantial asymmetries, even at x_F around zero. We also observe leading-particle-type asymmetries. These latter effects are qualitatively as expected from valence-quark content of the target and variety of projectiles studied.
LAMBDA production asymmetries versus XL for the positive beams.
LAMBDA production asymmetries versus PT**2 for the positive beams.
LAMBDA production asymmetries versus XL for the negative beams.
LAMBDA production asymmetries versus PT**2 for the negativs beams.
We report on a measurement of the inclusive cross sections of $\Lambda$ , $\overline\Lambda$ , K 0
Total inclusive hyperon production cross sections for the SIGMA- beam on the Copper target.
Total inclusive hyperon production cross sections for the SIGMA- beam on the Carbon target.
Total inclusive hyperon production cross sections per nucleon for the SIGMA- beam, and the exponent in the cross section parametrization of the form A**POWER.
Total inclusive hyperon production cross sections for the PI- beam on the Copper target.
Total inclusive hyperon production cross sections for the PI- beam on the Carbon target.
Total inclusive hyperon production cross sections per nucleon for the PI- beam, and the exponent in the cross section parametrization of the form A**POWER.
Total inclusive hyperon production cross sections for the Neutron beam on the Copper target.
Total inclusive hyperon production cross sections for the Neutron beam on the Carbon target.
Total inclusive hyperon production cross sections per nucleon for the Neutron beam, and the exponent in the cross section parametrization of the form A**POWER.
Differential cross sections as a function of XL for LAMBDA production in CUand C with the Neutron beam.
Differential cross sections as a function of XL for LAMBDA production in CUand C with the PI- and SIGMA- beams.
Differential cross sections as a function of PT**2 for LAMBDA production inCU and C with the Neutron beam.
Differential cross sections as a function of PT**2 for LAMBDA production inCU and C with the PI- and SIGMA- beams.
Differential cross sections as a function of XL for LAMBDABAR production inCU and C with the Neutron beam.
Differential cross sections as a function of XL for LAMBDABAR production inCU and C with the PI- and SIGMA- beams.
Differential cross sections as a function of PT**2 for LAMBDABAR productionin CU and C with the Neutron beam.
Differential cross sections as a function of PT**2 for LAMBDABAR productionin CU and C with the PI- and SIGMA- beams.
Differential cross sections as a function of XL for K0 production in CU andC with the Neutron beam.
Differential cross sections as a function of XL for K0 production in CU andC with the PI- and SIGMA- beams.
Differential cross sections as a function of PT**2 for K0 production in CU and C with the Neutron beam.
Differential cross sections as a function of PT**2 for K0 production in CU and C with the PI- and SIGMA- beams.
Differential cross sections as a function of PT**2 for LAMBDA, LAMBDABAR and K0 production in CU and C with the SIGMA- beam.
Differential cross sections as a function of XL for OMEGA- production in CUand C with the SIGMA- beam.
Differential cross sections as a function of PT**2 for OMEGA- production inCU and C with the SIGMA- beam.
Differential cross sections as a function of XL for XIBAR+ production in CUand C with the Neutron beam.
Differential cross sections as a function of XL for XIBAR+ production in CUand C with the PI- and SIGMA- beams.
Differential cross sections as a function of PT**2 for XIBAR+ production inCU and C with the PI- and SIGMA- beams.
Differential cross sections as a function of PT**2 for XIBAR+ production inCU and C with the Neutron beam.
We present a measurement of the polarization of Antilambda hyperons produced in nu_mu charged current interactions. The full data sample from the NOMAD experiment has been analyzed using the same V0 identification procedure and analysis method reported in a previous paper for the case of Lambda hyperons. The Antilambda polarization has been measured for the first time in a neutrino experiment. The polarization vector is found to be compatible with zero.
Lambdabar polarization in regions of Feynman X (XL).
Lambdabar polarization in regions of the Bjorken scaling variable X.
We report on a measurement of the differential cross sections of inclusive$K^{\pm}_{890}$production in$\sigma^-, pi^-$and ne
The production cross sections for K*+- per nucleus and per nucleon for the SIGMA- beam.
The production cross sections for K*+- per nucleus and per nucleon for the PI- beam.
The production cross sections for K*+- per nucleus and per nucleon for the NEUTRON- beam.
The differential cross sections for K*- production as a function of XL.
The differential cross sections for K*+ production as a function of XL.
Differential production cross sections for K*- as a function of PT**2.
Differential production cross sections for K*+ as a function of PT**2.
Differential cross sections for K*- AND K*+ production from a neutron beam as a function of PT**2.
None
Total inclusive production cross sections for the SIGMA- beam on the Coppertarget.
Total inclusive production cross sections for the SIGMA- beam on the Carbontarget.
Total inclusive production cross sections per nucleon for the SIGMA- beam, and the exponent in the cross section parametrization of the form A**POWER.
Inclusive SIGMA(1660) production cross sections, times the < LAMBDA PI> branching ratio, in the XL range 0.3 to 1.0 for the SIGMA- beam on the Copper target.
Inclusive SIGMA(1660) production cross sections, times the < LAMBDA PI> branching ratio, in the XL range 0.3 to 1.0 for the SIGMA- beam on the Carbon target.
Inclusive SIGMA(1660) production cross sections per nucleon, times the < LAMBDA PI> branching ratio, in the XL range 0.3 to 1.0 for the SIGMA- beam on the Carbon target, and the exponent in the cross section parametrization of the formA**POWER.
Inclusive SIGMA(1385) production cross sections for the PI- beam with a Copper target, times the < LAMBDA PI> branching ratio., RE = PI- CU --> SIGMA(1385)- X. PI- CU --> SIGMA(1385)+ X.
Inclusive SIGMA(1385) production cross sections for the PI- beam with a Carbon target, times the < LAMBDA PI> branching ratio., RE = PI- C --> SIGMA(1385)-X. PI- C --> SIGMA(1385)+ X.
Inclusive SIGMA(1385) production cross sections per nucleon, times the < LAMBDA PI> branching ratio, for the PI- beam, and the exponent in the cross section parametrization of the form A**POWER.
Inclusive SIGMA(1385) production cross sections for the Neutron beam with aCopper target, times the < LAMBDA PI> branching ratio.
Inclusive SIGMA(1385) production cross sections for the Neutron beam with aCarbon target, times the < LAMBDA PI> branching ratio.
Inclusive SIGMA(1385) production cross sections per nucleon, times the < LAMBDA PI> branching ratio, for the Neutron beam, and the exponent in the cross section parametrization of the form A**POWER.
Differential cross sections as a function of XL for SIGMA+- production in CU and C with the SIGMA- beam.
Differential cross sections as a function of PT**2 for SIGMA+- production in CU and C with the SIGMA- beam.
Differential cross sections as a function of XL for SIGMA(1385)- productionin CU and C with the PI- and SIGMA- beams.
Differential cross sections as a function of XL for SIGMA(1385)- productionin CU and C with the Neutron beam.
Differential cross sections as a function of PT**2 for SIGMA(1385)- production in CU and C with the PI- and SIGMA- beams.
Differential cross sections as a function of PT**2 for SIGMA(1385)- production in CU and C with the Neutron beam.
Differential cross sections as a function of XL for SIGMA(1385)+ productionin CU and C with the PI- and SIGMA- beams.
Differential cross sections as a function of XL for SIGMA(1385)+ productionin CU and C with the Neutron beam.
Differential cross sections as a function of PT**2 for SIGMA(1385)+ production in CU and C with the PI- and SIGMA- beams.
Differential cross sections as a function of PT**2 for SIGMA(1385)+ production in CU and C with the Neutron beam.
Differential cross sections as a function of XL for SIGMABAR(1385)- production in CU and C with the SIGMA- beam.
Differential cross sections as a function of PT**2 for SIGMABAR(1385)- production in CU and C with the SIGMA- beam.
Differential cross sections as a function of XL for SIGMA(1660)+- production in CU and C with the SIGMA- beam.
Differential cross sections as a function of PT**2 for SIGMA(1660)+- production in CU and C with the SIGMA- beam.
We report results of the first measurements of Lambda and Antilambda polarization produced in deep inelastic polarized muon scattering on the nucleon. The results are consistent with an expected trend towards positive polarization with increasing x_F. The polarizations of Lambda and Antilambda appear to have opposite signs. A large negative polarization for Lambda at low positive x_F is observed and is not explained by existing models.A possible interpretation is presented.
The measured and corrected (undiluted) polarizations.
The measured and corrected (undiluted) polarizations.
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