Multiplicity of charged secondaries emitted in association with neutral strange particles in antiproton nucleus collisions at 40-GeV/c.

Akhobadze, K.G. ; Grigalashvili, T.S. ; Chikovani, L.D. ; et al.
Phys.Atom.Nucl. 63 (2000) 834-838, 2000.
Inspire Record 533010 DOI 10.17182/hepdata.31228

In collisions of 40-GeV/c antiprotons with D, Li, C, S, Cu, and Pb nuclei, mean multiplicities of various secondary particles are investigated as functions of the mass number A. The mass-number dependence of the mean multiplicities of positively charged particles suggests that the effect of intranuclear cascades is strong for the emission of Λ hyperons, but that it is relatively weak for the emission of either K 0 or \(\bar \Lambda \). Also measured are the yields of various neutral strange particles with respect to those of charged secondaries.

24 data tables

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Search for CP violation in D0 and D+ decays.

The FOCUS collaboration Link, J.M. ; Paolone, V.S. ; Reyes, M. ; et al.
Phys.Lett.B 491 (2000) 232-239, 2000.
Inspire Record 527840 DOI 10.17182/hepdata.42984

A high statistics sample of photoproduced charm particles from the FOCUS (E831) experiment at Fermilab has been used to search for CP violation in the Cabibbo suppressed decay modes D+ to K-K+pi+, D0 to K-K+ and D0 to pi-pi+. We have measured the following CP asymmetry parameters: A_CP(K-K+pi+) = +0.006 +/- 0.011 +/- 0.005, A_CP(K-K+) = -0.001 +/- 0.022 +/- 0.015 and A_CP(pi-pi+) = +0.048 +/- 0.039 +/- 0.025 where the first error is statistical and the second error is systematic. These asymmetries are consistent with zero with smaller errors than previous measurements.

3 data tables

All N-values corrected by efficiencies obtained from Monte-Carlo simulations. The CP asymmetry can be written as: ACP=(eta(D)-eta(DBAR))/(eta(D)+eta(DBAR)), where eta(Q=D+ KK)=(N(Q=D+ KK)/N(Q=D+ K) - N(Q=D- KK)/N(Q=D- K))/(N(Q=D+ KK)/N(Q=D+ K) + N(Q=D- KK)/N(Q=D- K)).

All N-values corrected by efficiencies obtained from Monte-Carlo simulations. The CP asymmetry can be written as: ACP=(eta(D)-eta(DBAR))/(eta(D)+eta(DBAR)), where eta(Q=D0 KK)=(N(Q=D0 KK)/N(Q=D0 K) - N(Q=DBAR0 KK)/N(Q=DBAR0 K))/(N(Q=D0 KK)/N(Q=D0 K) + N(Q=DBAR0 KK)/N(Q=DBAR0 K)).

All N-values corrected by efficiencies obtained from Monte-Carlo simulations. The CP asymmetry can be written as: ACP=(eta(D)-eta(DBAR))/(eta(D)+eta(DBAR)), where eta(Q=D0 PIPI)=(N(Q=D0 PIPI) - N(Q=DBAR0 PIPI))/(N(Q=D0 PIPI) + N(Q=DBAR0 PIPI)).


Charged particle productions at 90 degrees in the center-of-mass in very high energy proton proton collisions

Banner, M. ; Hamel, J.L. ; Pansart, J.P. ; et al.
Phys.Lett.B 41 (1972) 547-551, 1972.
Inspire Record 85071 DOI 10.17182/hepdata.28219

The transverse momentum distribution at 90° of pions, protons and antiprotons have been measured at the CERN intersecting storage rings for C.M. energies between 23.2 and 52.7 GeV. In this energy range, the pion and proton distributions are almost energy independent. The antiproton production rises by a factor of two between 23.2 and 52.7 GeV.

3 data tables

The invariant cross section was fitted by CONST*EXP(-SLOPE*PT).

The invariant cross section was fitted by CONST*EXP(-SLOPE(C=1)*PT+SLOPE(C=2)*PT**2).

No description provided.


Subthrehold K+ production in deuteron and alpha induced nuclear reactions.

Debowsky, M. ; Senger, P. ; Boivin, M. ; et al.
NUCL-EX-9709002, 1997.
Inspire Record 448262 DOI 10.17182/hepdata.31401

Double differential cross sections have been measured for pi+ and K+ emitted around midraidity in d+A and He+A collisions at a beam kinetic energy of 1.15 GeV/nucleon. The total pi+ yield increases by a factor of about 2 when using an alpha projectile instead of a deuteron whereas the K+ yield increases by a factor of about 4. According to transport calculations, the K+ enhancement depends both on the number of hadron-hadron collisions and on the energy available in those collisions: their center-of-mass energy increases with increasing number of projectile nucleons.

2 data tables

The spectra are fitted by the equation d3(sig)/d3(p) = CONST*exp(-Ekin/SLOPE), where Ekin is PI+ kinectic energy in the nucleon-nucleon center of mass frame.

The spectra are fitted by the equation d3(sig)/d3(p) = CONST*exp(-Ekin/SLOPE), where Ekin is K+ kinectic energy in the nucleon-nucleon center of mass frame.


Study of quasiexclusive neutral meson production in p N interactions at E(p) = 70-GeV in the deep fragmentation region.

The SPHINX collaboration Golovkin, S.V. ; Kozhevnikov, A.P. ; Kubarovsky, V.P. ; et al.
Z.Phys.A 359 (1997) 327-335, 1997.
Inspire Record 445405 DOI 10.17182/hepdata.40690

Quasiexclusive neutral meson production in pN-interactions is studied in experiments with the SPHINX facility operating in a proton beam from the IHEP accelerator (Ep=70 GeV). The cross sections and the parameters of the differential distributions for πo, ω, η and Ko production in the deep fragmentation region (xF > 0.79 ÷ 0.86) are presented. The results show that such proton quasiexclusive reactions with baryon exchange may be promising in searches for exotic mesons.

8 data tables

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Data on the graph only.

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Normalized Small Y Cross-Sections for Neutrinos and anti-neutrinos at High-Energy

Barish, B.C. ; Bartlett, J.F. ; Bodek, A ; et al.
Phys.Rev.Lett. 39 (1977) 741, 1977.
Inspire Record 5717 DOI 10.17182/hepdata.50114

We present results on flux-normalized neutrino and antineutrino cross sections near y=0 from data obtained in the Fermilab narrow-band beam. We conclude that values of σ0=dσdy|y=0 are consistent with rising linearly with energy over the range 45<~Eν<~20.5 GeV. The separate averages of ν and ν¯, each measured to 4%, are equal to well within the errors. The best fit for the combined data gives σ0E=(0.719±0.035)×10−38 cm2/GeV at an average Eν of 100 GeV.

2 data tables

FE nucleus. The SIG/Enu is fitted to CONST(N=SIG)+CONST(N=T)*E.

FE nucleus. Averaged over the energies and beams.


Energy Dependence of the Pseudorapidity Distributions in Proton-Nucleus Collisions Between 50-GeV/c and 200-GeV/c.

Halliwell, C. ; Elias, J.E. ; Busza, W. ; et al.
Phys.Rev.Lett. 39 (1977) 1499-1502, 1977.
Inspire Record 123287 DOI 10.17182/hepdata.21004

Pseudorapidity distributions for proton-nucleus interactions are presented. The data cover twelve nuclei ranging from carbon to uranium and three incident proton momenta, 50, 100, and 200 GeV/c.

1 data table

Three-dimensional avegage multiplicity distribution is parametrized to CONST(C=F)+CONST(C=G)*COL+CONST(C=H)*COL, where COL = A(N=NUCLEUS)*SIG(Q=P P)/SIG(Q=P NUCLEUS).


Production of Multi - Pion Systems With Large Longitudinal Momentum at the {CERN} {ISR}

Lockman, William S. ; Meyer, T. ; Rander, J. ; et al.
Phys.Rev.Lett. 41 (1978) 680-683, 1978.
Inspire Record 6695 DOI 10.17182/hepdata.20814

Inclusive cross sections are presented for 2π and 3π systems with large longitudinal x at the highest intersecting storage ring energies (s=53 GeV for 2π; s=53 and 62 GeV for 3π). The ratio π+π−π−π− rises sharply with increasing x similar to the ratio K+K−, as expected in a quark-model interpretation.

2 data tables

The differential cross section is fitted by the equation : E*D3(SIG)/D3(P) = CONST*(1-XL)**POWER*EXP(-SLOPE*PT**2).

The differential cross section is fitted by the equation : E*D3(SIG)/D3(P) = CONST*(1-XL)**POWER*EXP(-SLOPE*PT**2).


Scaling properties of high mass symmetric hadron and pion pair production in proton - beryllium collisions

Jostlein, H. ; Engelmann, Roderich J. ; Fisk, R.J. ; et al.
Phys.Rev.Lett. 42 (1979) 146, 1979.
Inspire Record 132764 DOI 10.17182/hepdata.42603

We present measurements of the production symmetric high-mass hadron and pion pairs by protons of 200, 300, and 400 GeV, incident on a beryllium target. The two-particle invariant cross section for pion production can be described by the function E1E2d6σdp13dp23=(1.7×10−28)pt−8.4(1−xt)14 cm2/GeV4 (where pt is the mean pt of the two hadrons). Functions of the same form have been used in describing single-pion inclusive production. Equality of the exponents of pt in the two processes is observed, confirming the role of smearing contributions to single-hadron cross sections.

2 data tables

E*D3(SIG)/D3(P) is fitted by CONST*(1-XT)**POWER*PT**POWER.

E1*E2*D6(SIG)/D3(P1)/D3(P2) is fitted by CONST*(1-XT)**POWER*PT**POWER, where PT is (pt1 + pt2)/2.


MEASUREMENT OF P P ---> P X BETWEEN 50-GEV/C AND 400-GEV/C.

Abe, K. ; De Lillo, T. ; Robinson, B. ; et al.
Phys.Rev.Lett. 31 (1973) 1527-1530, 1973.
Inspire Record 81796 DOI 10.17182/hepdata.50301

We present measurements of the invariant cross section for the inclusive reaction p+p→p+X in the region 0.14<|t|<0.38 GeV2, 100<s<750 GeV2, and 0.80<x<0.93.

1 data table

The cross sections are fitted by the formula CONST(C=A)*EXP(SLOPE*T)*(1+CO NST(C=B)/SQRT(S)).