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ALICE Collaboration,
B. Abelev,
J. Adam,
D. Adamova,
A. M. Adare,
M. M. Aggarwal,
G. Aglieri Rinella,
A. G. Agocs,
A. Agostinelli,
S. Aguilar Salazar, [......],
X. Zhang,
D. Zhou,
Y. Zhou,
F. Zhou,
X. Zhu,
A. Zichichi,
A. Zimmermann,
G. Zinovjev,
Y. Zoccarato,
M. Zynovyev
[show abstract]
[hide abstract]
ABSTRACT: The ALICE Collaboration has measured inclusive J/psi production in pp
collisions at a center of mass energy sqrt(s)=2.76 TeV at the LHC. The results
presented in this Letter refer to the rapidity ranges |y|<0.9 and 2.5<y<4 and
have been obtained by measuring the electron and muon pair decay channels,
respectively. The integrated luminosities for the two channels are L^e_int=1.1
nb^-1 and L^mu_int=19.9 nb^-1, and the corresponding signal statistics are
N_J/psi^e+e-=59 +/- 14 and N_J/psi^mu+mu-=1364 +/- 53. We present
dsigma_J/psi/dy for the two rapidity regions under study and, for the forward-y
range, d^2sigma_J/psi/dydp_t in the transverse momentum domain 0<p_t<8 GeV/c.
The results are compared with previously published results at sqrt(s)=7 TeV and
with theoretical calculations.
03/2012;
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T. S. Nigmanov,
D. Rajaram,
M. J. Longo,
U. Akgun,
G. Aydin,
W. Baker,
Barnes, Jr., P. D,
T. Bergfeld,
A. Bujak,
D. Carey, [......],
C. Rosenfeld,
H. A. Rubin,
S. Seun,
N. Solomey, R. Soltz,
E. Swallow,
Y. Torun,
K. Wilson,
D. Wright,
K. Wu
[show abstract]
[hide abstract]
ABSTRACT: We have measured cross sections for forward neutron production from a variety
of targets using proton beams from the Fermilab Main Injector. Measurements
were performed for proton beam momenta of 58 GeV/c, 84 GeV/c, and 120 GeV/c.
The cross section dependence on the atomic weight (A) of the targets was found
to vary as $A^(alpha)$ where $\alpha$ is $0.46\pm0.06$ for a beam momentum of
58 GeV/c and 0.54$\pm$0.05 for 120 GeV/c. The cross sections show reasonable
agreement with FLUKA and DPMJET Monte Carlos. Comparisons have also been made
with the LAQGSM Monte Carlo.
10/2010;
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The MIPP Collaboration,
N Graf,
A Lebedev,
R. J. Abrams,
U Akgun,
G. Aydin,
W. Baker,
P. D. Barnes Jr,
T Bergfeld,
L. Beverly, [......],
N Solomey, R. Soltz,
E Swallow,
R Schmitt,
P. Subbarao,
Y. Torun,
T. E. Tope,
K Wilson,
D Wright,
K. Wu
[show abstract]
[hide abstract]
ABSTRACT: The two most recent and precise measurements of the charged kaon mass use X-rays from kaonic atoms and report uncertainties of 14 ppm and 22 ppm yet differ from each other by 122 ppm. We describe the possibility of an independent mass measurement using the measurement of Cherenkov light from a narrow-band beam of kaons, pions, and protons. This technique was demonstrated using data taken opportunistically by the Main Injector Particle Production experiment at Fermi National Accelerator Laboratory which recorded beams of protons, kaons, and pions ranging in momentum from +37 GeV/c to +63 GeV/c. The measured value is 491.3 +/- 1.7 MeV/c^2, which is within 1.4 sigma of the world average. An improvement of two orders of magnitude in precision would make this technique useful for resolving the ambiguity in the X-ray data and may be achievable in a dedicated experiment. Comment: 6 pages, 7 figures. Submitted to Nuclear Instruments and Methods A
09/2009;
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[show abstract]
[hide abstract]
ABSTRACT: The following pages show results from the first series of runs on BG/L using the unoptimized code from the MILC collaboration. The calculations were run with the AsqTad improved staggered fermion action and the RHMC algorithm on a 32{sup 3} x 8 lattice. The jobs were run mostly during October, 2006 on approximately 5% of the machine. The run consisted of approximately 1000 trajectories per beta value, spanning beta = 6.458 to 6.85, covering a temperature range of 140-210 MeV.
11/2006;
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T. Abbott,
L. Ahle,
Y. Akiba,
D. Alburger,
D. Beavis,
L. Birstein,
M. A. Bloomer,
P. D. Bond,
H. C. Britt,
B. Budick, [......],
F. Q. Wang,
Y. Wang,
III W. A. Watson,
H. E. Wegner,
D. S. Woodruff,
Y. D. Wu,
K. Yagi,
X. Yang,
D. Zachary,
W. A. Zajc
[show abstract]
[hide abstract]
ABSTRACT: In a previous publication [T. Abbott et al., E802 Collaboration, Phys. Rev. C 63, 064602 (2001); 64, 029901(E) (2001)], measurements of the A dependence and pseudorapidity interval (δη) dependence of midrapidity ET distributions in a half-azimuth (Δφ=π) electromagnetic calorimeter were presented for p+Be, p+Au, O+Cu, Si+Au, and Au+Au collisions at the BNL-AGS. The validity of the “nuclear geometry” characterization versus δη was illustrated by plots of the ET(δη) distribution in each δη interval in units of the measured 〈ET(δη)〉p+Au in the same δη interval for p+Au collisions. These plots, with aperture corrected scale in the physically meaningful units of number of average observed p+Au collisions, were nearly universal as a function of δη, confirming that the reaction dynamics for ET production at midrapidity at AGS energies is governed by the number of projectile participants and can be well characterized by measurements in apertures as small as Δφ=π,δη=0.3. A key ingredient in these analyses is the probability p0 for no signal to be detected in a given aperture δη for the fundamental p+Au collision. In fact the measured 〈ET(δη)〉p+Au is biased and the true 〈ET(δη)〉p+Autrue for the detector aperture is the measured value times 1-p0. The issues and merits of measuring the ET(δη) distribution in units of 〈ET(δη)〉p+Au or 〈ET(δη)〉p+Autrue in the same δη interval are presented and discussed. This method has application at RHIC, where p-p data could be used as the reference distribution for two participants. The ET distributions for B+A collisions, with ET(δη) scale normalized by 〈ET(δη)〉p-ptrue in the same aperture for p-p collisions, would then be given directly in the popular unit “per participant-pair” [K. Adcox et al., PHENIX Collaboration, Phys. Rev. Lett. 86, 3500 (2001); I. G. Bearden et al., BRAHMS Collaboration, Phys. Lett. B523, 227 (2001); B. B. Back et al., PHOBOS Collaboration, Phys. Rev. C 65, 031901(R) (2002); C. Adler et al., STAR Collaboration, Phys. Rev. Lett. 89, 202301 (2002)].
Phys. Rev. C. 09/2003; 68(3).
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I. Chemakin,
V. Cianciolo,
B. A. Cole,
R. Fernow,
A. Frawley,
M. Gilkes,
S. Gushue,
E. Hartouni,
H. Hiejima,
M. Justice, [......],
M. Rosati,
Y. Shin, R. Soltz,
S. Sorensen,
J. Thomas,
Y. Torun,
D. Winter,
X. Yang,
W. A. Zajc,
Y. Zhang
[show abstract]
[hide abstract]
ABSTRACT: Inclusive and semi-inclusive measurements are presented for antiproton (p̅ ) production in proton-nucleus collisions at the Alternating Gradient Synchrotron (AGS). The inclusive yields per event increase strongly with increasing beam energy and decrease slightly with increasing target mass. The p̅ yield in 17.5 GeV/c p+Au collisions decreases with grey track multiplicity, Ng, for Ng>0, consistent with annihilation within the target nucleus. The relationship between Ng and the number of scatterings of the proton in the nucleus is used to estimate the p̅ annihilation cross section in the nuclear medium. The resulting cross section is at least a factor of 5 smaller than the free p̅ -p annihilation cross section when assuming a small or negligible formation time. Only with a long formation time can the data be described with the free p̅ -p annihilation cross section.
Phys. Rev. C. 11/2001; 64(6).
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I. Chemakin,
V Cianciolo,
B A Cole,
R. Fernow,
A. Frawley,
M. Gilkes,
S. Gushue,
E. Hartouni,
H. Hiejima,
M. Justice, [......],
M Rosati,
Y. Shin, R. Soltz,
S Sorensen,
J Thomas,
Y. Torun,
D. Winter,
X Yang,
W A Zajc,
Y Zhang
[show abstract]
[hide abstract]
ABSTRACT: Inclusive and semi-inclusive measurements are presented for antiproton ($\bar{p}$) production in proton-nucleus collisions at the AGS. The inclusive yields per event increase strongly with increasing beam energy and decrease slightly with increasing target mass. The $\bar{p}$ yield in 17.5 GeV/c p+Au collisions decreases with grey track multiplicity, $N_g$, for $N_g>0$, consistent with annihilation within the target nucleus. The relationship between $N_g$ and the number of scatterings of the proton in the nucleus is used to estimate the $\bar{p}$ annihilation cross section in the nuclear medium. The resulting cross section is at least a factor of five smaller than the free $\bar{p}-p$ annihilation cross section when assuming a small or negligible formation time. Only with a long formation time can the data be described with the free $\bar{p}-p$ annihilation cross section. Comment: 8 pages, 6 figures
07/2001;
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T. Abbott,
L. Ahle,
Y. Akiba,
D. Alburger,
D. Beavis,
L. Birstein,
M. A. Bloomer,
P. D. Bond,
H. C. Britt,
B. Budick, [......],
F. Q. Wang,
Y. Wang,
III W. A. Watson,
H. E. Wegner,
D. S. Woodruff,
Y. D. Wu,
K. Yagi,
X. Yang,
D. Zachary,
W. A. Zajc
[show abstract]
[hide abstract]
ABSTRACT: Measurements of the A dependence and pseudorapidity interval (δη) dependence of midrapidity ET distributions in a half-azimuth (Δφ=π) electromagnetic calorimeter are presented for p+Be, p+Au, O+Cu, Si+Au, and Au+Au collisions at the BNL-AGS (Alternating-Gradient Synchrotron). The shapes of the upper edges of midrapidity ET distributions as a function of the pseudorapidity interval δη in the range 0.3 to 1.3, roughly centered at midrapidity, are observed to vary with δη, like multiplicity—the upper edges of the distributions flatten as δη is reduced. At the typical fixed upper percentiles of ET distributions used for nuclear geometry characterization by centrality definition—7 percentile, 4 percentile, 2 percentile, 1 percentile, 0.5 percentile—the effect of this variation in shape on the measured projectile Ap dependence for 16O, 28Si, 197Au projectiles on an Au target is small for the ranges of δη and percentile examined. The ET distributions for p+Au and p+Be change in shape with δη; but in each δη interval the shapes of the p+Au and p+Be distributions remain indentical with each other—a striking confirmation of the absence of multiple-collision effects at midrapidity at AGS energies. The validity of the nuclear geometry characterization versus δη is illustrated by plots of the ET(δη) distribution in each δη interval in units of the measured 〈ET(δη)〉p+Au in the same δη interval for p+Au collisions. These plots, in the physically meaningful units of “number of average p+Au collisions,” are nearly universal as a function of δη, confirming that the reaction dynamics for ET production at midrapidity at AGS energies is governed by the number of projectile participants and can be well characterized by measurements in apertures as small as Δφ=π, δη=0.3.
Phys. Rev. C. 04/2001; 63(6).
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Y. Fisyak,
A. Godley,
S R Mishra,
C Rosenfeld,
R Winston,
E Swallow,
J. Hylen,
N. Mokhov,
J. Morfin,
C. T. Murphy, [......],
E. Hartouni,
S. Johnson, R. Soltz,
D Wright,
S Chernichenko,
Y. Galitsky,
Y. Gutnikov,
V Onuchin,
E Melnikov,
V Semenov
[show abstract]
[hide abstract]
ABSTRACT: We propose to measure hadronic particle production with excellent particle identification using primary and secondary beams from the Main Injector. The goals of the experiment are: to verify a general scaling law of hadronic fragmentation; to measure particle production off NuMI targets using 120 GeV/c protons with sufficient accuracy to predict the NuMI neutrino spectrum; and to collect a comprehensive data set that would have a profound impact on related physics issues, such as atmospheric neutrino flux estimates, neutrino factory design, and simulations of hadronic showers for highenergy colliders. This experiment could also form the basis for a long-term program in light-meson spectroscopy. i Contents 1 Executive Summary 1 2 Introduction 2 3 Physics Motivation 4 3.1 Scaling Law of Hadronic Fragmentation . . . . . . . . . . . . . . . . . . . . . 4 3.2 Systematic Errors in NuMI/MINOS Measurements of Neutrino Oscillation Parameters . . . . . . . . . . . . . . . . . . . . ....
02/2001;
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[show abstract]
[hide abstract]
ABSTRACT: We hereby submit a proposal to measure hadronic particle production with particle identification in the Meson area (M-Center) using primary and secondary beams from the Main Injector off a variety of targets. The purposes of the experiment are threefold; to verify a general scaling law hadronic fragmentation, to measure particle production off a NUMI target using 120 GeV/c protons with sufficient accuracy to predict the NUMI neutrino spectrum and to measure proton nucleus cross sections for the purposes of proton radiography. A measurement of low momentum pion production will also be of benefit to the muon collider effort. Spokesperson 1 Contents I Introduction 3 II Scaling law of hadronic fragmentation 3 III Systematic Errors in NuMI/MINOS Measurements of Neutrino Oscillation Parameters 5 IV Proton Radiography 10 V Implementation scheme 12 VI Beam requirements 13 VII Resolution Studies 17 VIII Particle Identification 17 IX Data Acquisition 17 X Costs 18 2 I. INTRODUCTION...
12/1999;
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L. Ahle,
Y. Akiba,
K. Ashktorab,
M. D. Baker,
D. Beavis,
H. C. Britt,
J. Chang,
C. Chasman,
Z. Chen,
C.-Y. Chi, [......],
S. Ueno-Hayashi,
F. Videbæk,
F. Wang,
Y. Wu,
H. Xiang,
G. H. Xu,
K. Yagi,
H. Yao,
W. A. Zajc,
F. Zhu
[show abstract]
[hide abstract]
ABSTRACT: Proton and deuteron distributions from 11.6A GeV/c Au + Au collisions measured by the E802 Collaboration in experiment E-866 are presented. The invariant yield of protons and deuterons is studied as a function of the transverse mass for different cuts of rapidity and centrality. At low mt-m0 the proton and deuteron invariant spectra deviate from a single exponential shape. The average mt as function of centrality and rapidity is used to explore the effect of collective transverse flow in the reaction. The ratio of the deuteron to squared proton yield as a function of transverse momentum, rapidity, and centrality is used to probe the coalescence model of deuteron production. This ratio is constant as a function of rapidity only for the most central cuts and decreases with the centrality for every rapidity cut. The ratio of the differential cross section of the deuteron to the squared differential cross section of the proton, for the most central cut, is not constant as a function of mt-m0.
Phys. Rev. C. 10/1999; 60(6).
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L. Ahle,
Y. Akiba,
K. Ashktorab,
M. Baker,
D. Beavis,
P. Beery,
H. C. Britt,
B. Budick,
J. Chang,
C. Chasman, [......],
H. E. Wegner,
D. Woodruff,
Y. Wu,
G. H. Xu,
K. Yagi,
X. Yang,
D. Zachary,
W. A. Zajc,
F. Zhu,
Q. Zhu
[show abstract]
[hide abstract]
ABSTRACT: Charged kaon production has been measured in Si+Al and Si+Au collisions at 14.6A GeV/c, and Au+Au collisions at 11.1A GeV/c by Experiments 859 and 866 (the E-802 Collaboration) at the BNL AGS. Invariant transverse mass spectra and rapidity distributions for both K+ and K- are presented. The centrality dependence of rapidity-integrated kaon yields is studied. Strangeness enhancement is observed as an increase in the slope of the kaon yield with the total number of participants as well as the yield per participant. The enhancement starts with peripheral Si+Al and Si+Au collisions (relative to N+N) and appears to saturate for a moderate number of participating nucleons in Si+Au collisions. It is also observed to increase slowly with centrality in Au+Au collisions, to a level in the most central Au+Au collisions that is greater than that found in central Si+A collisions. The enhancement factors for K+ production are 3.0±0.2(stat)±0.4(syst) and 4.0±0.3(stat)±0.5(syst), respectively, for the most central 7% Si+Au collisions and the most central 4% Au+Au collisions relative to N+N at the correponding beam energy.
Phys. Rev. C. 09/1999; 60(4).
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I. Chemakin,
V. Cianciolo,
B. A. Cole,
R. Fernow,
A. Frawley,
M. Gilkes,
S. Gushue,
E. Hartouni,
H. Hiejima,
M. Justice, [......],
M. Rosati,
Y. H. Shin, R. Soltz,
S. Sorensen,
J. Thomas,
Y. Torun,
D. Winter,
X. Yang,
W. A. Zajc,
Y. Zhang
[show abstract]
[hide abstract]
ABSTRACT: In Experiment 910 at the Brookhaven National Laboratory AGS accelerator,
we studied proton-nucleus collisions in a large-acceptance, TPC-based
spectrometer using a variety of target/beam energy combinations. The
experiment was designed to study strange particle production in
proton-nucleus collisions and has excellent acceptance for neutral
strange particles decaying at least 1cm downstream of the target. The
E910 spectrometer also has good sensitivity to Λpπ-
decays and modest sensitivity to Σ-p decay channels of
the hypothesized H dibaryon. Preliminary results on the centrality
dependence of Λ production in 18GeV p+Au collisions are presented
along with results of our first search for
H-->Λpπ- and H-->Σ-p decays
in the 18GeV/c p+Au data set.
Nuclear Physics A 07/1998; 639:407-416. · 1.54 Impact Factor
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George S. F. Stephans,
Y. Akiba,
D. Beavis,
P. Beery,
H. C. Britt,
B. Budick,
C. Chasman,
Z. Chen,
C. Y. Chi,
Y. Y. Chu, [......],
O. Vossnack,
V. Vutsadakis,
F. Q. Wang,
Y. Wang,
H. E. Wegner,
D. S. Woodruff,
Y. D. Wu,
X. Yang,
D. Zachary,
W. A. Zajc
Nuclear Physics A 12/1993; 566:269-276. · 1.54 Impact Factor
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Y. Akiba,
D. Beavis,
P. Beery,
H. C. Britt,
B. Budick,
C. Chasman,
Z. Chen,
C. Y. Chi,
Y. Y. Chu,
V. Cianciolo, [......],
J. H. van Dijk,
F. Videbaek,
O. Vossnack,
V. Vutsadakis,
F. Q. Wang,
Y. Wang,
H. E. Wegner,
D. S. Woodruff,
Y. D. Wu,
W. Zajc
Nuclear Physics A 06/1992; 544:445-448. · 1.54 Impact Factor
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L. Ahle,
Y. Akiba,
K. Ashktorab,
M.D. Baker,
D. Beavis,
H.C. Britt,
J. Chang,
C. Chasman,
Z. Chen,
Y.Y. Chu, [......],
S. Ueno-Havashi,
F. Videb˦k,
F. Wang,
Y. Wu,
H. Xiang,
G.H. Xu,
K. Yagi,
H. Yao,
W.A. Zajc,
F. Zhu
[show abstract]
[hide abstract]
ABSTRACT: Antiproton production in 11.7 A·GeV/c Au+Au collisions over a wide transverse-mass coverage was studied in the AGS-E866. The inverse slope parameter increases rapidly as a function of centrality. Antiproton yields in Si+A and Au+Au collisions are consistent with the scaling with the 2/3 power of the number of participant nucleons. Transverse-mass spectra are similar to those of protons from peripheral to central Au+Au collisions.
Nuclear Physics A. 638:427.
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T. Chujo,
L. Ahle,
Y. Akiba,
K. Ashktorab,
M. D. Baker,
D. Beavis,
H. C. Britt,
J. Chang,
C. Chasman,
Z. Chen, [......],
F. Wang,
Y. Wang,
Y. Wu,
H. Xiang,
G. H. Xu,
K. Yagi,
H. Yao,
W. A. Zajc,
Q. Zhu,
F. Zhu
[show abstract]
[hide abstract]
ABSTRACT: First measurements of single particle spectra of
π±, K+ and p in 197Au + Au
collisions at Ekine = 4 GeV per nucleon are presented.
Utilizing the 4 A GeV data set from the Forward Spectrometer at the
AGS-E866 experiment, transverse mass distributions and rapidity density
distributions of π±, K+ and p near the
mid-rapidity region are extracted. Preliminary results are compared with
those of the microscopic cascade model calculation, RQMD.
Progress of Theoretical Physics Supplement 129:173-177. · 1.06 Impact Factor
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L. Ahle,
Y. Akiba,
K. Ashktorab,
M. D. Baker,
D. Beavis,
H. C. Britt,
J. Chang,
C. Chasman,
Z. Chen,
C.-Y. Chi, [......],
F. Q. Wang,
Y. Wang,
D. S. Woodruff,
Y. Wu,
G. Xu,
K. Yagi,
D. Zachary,
W. A. Zajc,
F. Zhu,
Q. Zhu
[show abstract]
[hide abstract]
ABSTRACT: Systematic results are presented on proton, deuteron, and triton emission from the target spectator region in collisions of 10.20A GeV gold projectiles with a gold target. A forward hodoscope utilizes detection of projectile spectator fragments to determine the orientation of the reaction plane, event by event. The directed flow 〈px〉 is determined as a function of pseudorapidity. Projectile spectator energy is used to estimate impact parameters. Results are compared to current theoretical models ARC, ART, and RQMD. In all cases good agreement with theory is obtained for calculations utilizing a pure cascade without nuclear potential contributions.
Phys. Rev. C. 57(3).
-
L. Ahle,
Y. Akiba,
D. Beavis,
P. Beery,
H. C. Britt,
B. Budick,
C. Chasman,
Z. Chen,
C. Y. Chi,
Y. Y. Chu, [......],
V. Vustadakis,
F. Q. Wang,
Y. Wang,
H. E. Wegner,
D. S. Woodruff,
Y. D. Wu,
K. Yagi,
X. Yang,
D. Zachary,
W. A. Zajc
[show abstract]
[hide abstract]
ABSTRACT: We report measurements of proton emission at target rapidities for minimum bias and central collisions of 14.6AGeV/c 28Si with Al, Cu, and Au nuclei as well as minimum bias and central collisions of 11.7AGeV/c 197Au with Au nuclei. Results for deuteron emission are also reported for the Si+Au reaction. The spectra span the laboratory angular range of 50°<~θ<~130° and kinetic energy range of 40MeV<~Ekin<~225MeV. Inverse slopes of proton spectra and proton dN/dη values in the kinetic energy range 50MeV<~Ekin<~110MeV are reported. The inverse slopes are 40–80 MeV for the various systems, generally increasing with increasing pseudorapidity. The dN/dη values for A+A collisions within the restricted kinetic energy interval are compared to those for protons from p+Au in the literature. All pseudorapidity distributions have very similar shapes. The experimental results have been compared to the predictions of the nucleon-nucleon collision models ARC and RQMD. The predictions made by these two models for the distribution of protons at target rapidities are very similar to each other. However, there are significant differences between the model predictions and the experimental results in the details of the spectral slopes and the proton yields for different trigger conditions.
Phys. Rev. C. 55(5).
-
Y. Akiba,
D. Beavis,
P. Beery,
H. C. Britt,
B. Budick,
C. Chasman,
Z. Chen,
C. Y. Chi,
Y. Y. Chu,
V. Cianciolo, [......],
O. Vossnack,
V. Vutsadakis,
F. Q. Wang,
Y. Wang,
H. E. Wegner,
D. S. Woodruff,
Y. D. Wu,
X. Yang,
D. Zachary,
W. A. Zajc
[show abstract]
[hide abstract]
ABSTRACT: In previous work, the E802 Collaboration at the BNL-AGS used negative binomial distribution (NBD) fits to charged particle multiplicity distributions from central collisions of 16O+Cu at 14.6A GeV/c to derive the two-particle short-range rapidity correlation length and strength. These turned out to be much shorter and weaker than the values for hadron collisions, which led to a simple and elegant explanation of intermittency. In the present work, a direct measurement of the two-particle correlation of identified pions in the E802/E859 magnetic spectrometer is performed in the interval 1.5<~y<~2.0 for central 28Si+Au collisions, both in terms of Qinv=√|q→|2-q02, where q=p2-p1=(q→,q0), and also in terms of |η2-η1| and |y2-y1|, where p,η, and y are the four-momentum, pseudorapidity, and rapidity of the pions. It is demonstrated that the two-pion correlation in rapidity (and pseudorapidity) is entirely due to the Bose-Einstein interference. The directly measured correlation length in both η and y is ξ=0.19±0.03 for two π-, with strength R(0,0)∼1%, in agreement with the previous E802 indirect measurements derived from the NBD analysis of intermittency.
Phys. Rev. C. 56(3).
