Date

Subject_areas

Production of $\Lambda $ -hyperons in inelastic p+p interactions at 158 ${\mathrm{GeV}}\!/\!c$

The NA61/SHINE collaboration Aduszkiewicz, A. ; Ali, Y. ; Andronov, E. ; et al.
Eur.Phys.J. C76 (2016) 198, 2016.
Inspire Record 1397634 DOI 10.17182/hepdata.76910

Inclusive production of $\Lambda $ -hyperons was measured with the large acceptance NA61/SHINE spectrometer at the CERN SPS in inelastic p+p interactions at beam momentum of 158  ${\mathrm{GeV}}\!/\!c$ . Spectra of transverse momentum and transverse mass as well as distributions of rapidity and x$_{_F}$ are presented. The mean multiplicity was estimated to be $0.120\,{\pm }\,0.006\,(stat.)\,{\pm }0.010\,(sys.)$ . The results are compared with previous measurements and predictions of the Epos, Urqmd and Fritiof models.

6 data tables

Double-differential yield $\frac{d^2n}{dydp_{_T}}$.

Double-differential yield $\frac{d^2n}{dydm_{_T}}$.

Double-differential yields, $\frac{d^{2}n}{x_{_F}p_{_T}}$ and $f_n(x_{_F},p_{T})$, for $x_{_F}<0$.

More…

Scaled momentum distributions of charged particles in dijet photoproduction at HERA

The ZEUS collaboration Chekanov, S. ; Derrick, M. ; Magill, S. ; et al.
JHEP 0908 (2009) 077, 2009.
Inspire Record 818528 DOI 10.17182/hepdata.52943

The scaled momentum distributions of charged particles in jets have been measured for dijet photoproduction with the ZEUS detector at HERA using an integrated luminosity of 359 pb-1. The distributions are compared to predictions based on perturbative QCD carried out in the framework of the modified leading-logarithmic approximation (MLLA) and assuming local parton-hadron duality (LPHD). The universal MLLA scale, Lambda_eff, and the LPHD parameter, kappa^ch, are extracted.

15 data tables

Distribution of multiplicity of charged particles in a jet as a function of LN(1/X) for mean jet energy 19 GeV and jet cone opening angle 0.23.

Distribution of multiplicity of charged particles in a jet as a function of LN(1/X) for mean jet energy 23 GeV and jet cone opening angle 0.23.

Distribution of multiplicity of charged particles in a jet as a function of LN(1/X) for mean jet energy 28 GeV and jet cone opening angle 0.23.

More…

Charged Particle Production in High Q**2 Deep-Inelastic Scattering at HERA

The H1 collaboration Aaron, F.D. ; Aktas, A. ; Alexa, C. ; et al.
Phys.Lett. B654 (2007) 148-159, 2007.
Inspire Record 753349 DOI 10.17182/hepdata.45525

The average charged track multiplicity and the normalised distribution of the scaled momentum, $\xp$, of charged final state hadrons are measured in deep-inelastic $\ep$ scattering at high $Q^2$ in the Breit frame of reference. The analysis covers the range of photon virtuality $100 &lt; Q^2 &lt; 20 000 \GeV^{2}$. Compared with previous results presented by HERA experiments this analysis has a significantly higher statistical precision and extends the phase space to higher $Q^{2}$ and to the full range of $\xp$. The results are compared with $e^+e^-$ annihilation data and with various calculations based on perturbative QCD using different models of the hadronisation process.

11 data tables

Average values of Q and X (plus errors) for the different Q**2 ranges.

Average charged hadron multiplicity as a function of Q**2.

Normalised distribution of the scaled momentum as a function of Q**2 in the X range 0 to 0.02.

More…

Masses, Lifetimes and Production Rates of Xi- and anti-Xi+ at LEP 1

The DELPHI collaboration Abdallah, J. ; Abreu, P. ; Adam, W. ; et al.
Phys.Lett. B639 (2006) 179-191, 2006.
Inspire Record 719387 DOI 10.17182/hepdata.26952

Measurements of the Xi- and anti-Xi+ masses, mass differences, lifetimes and lifetime differences are presented. The anti-Xi+ sample used is much larger than those used previously for such measurements. In addition, the Xi production rates in Z -> b anti-b and Z -> q anti-q events are compared and the position xi* of the maximum of the xi distribution in Z -> q anti-q events is measured.

3 data tables

Corrected LN(1/X) distribution for (XI- + XIBAR+) production.

Measured and extrapoplated production rates.

Extrapolated production rate in b-bbar events.


Precise measurement of the b quark fragmentation function in Z0 boson decays

The SLD collaboration Abe, Kenji ; Abe, Koya ; Abe, T. ; et al.
Phys.Rev.Lett. 84 (2000) 4300-4304, 2000.
Inspire Record 512427 DOI 10.17182/hepdata.19428

We have developed a new technique for inclusive reconstruction of the energy of B hadrons. The excellent efficiency and resolution of this technique allow us to make the most precise determination of the b-quark fragmentation function, using e+e- -> Z0 decays recorded in the SLD experiment at SLAC. We compared our measurement with the predictions of a number of fragmentation models. We excluded several of these models and measured the average scaled energy of weakly-decaying B hadrons to be <x_B>=0.714+-0.005(stat)+-0.007(syst) +-0.002(model dependence).

1 data table

Unfolded distribution of weakly decaying scaled B-hadron enery with statistical errors only.


Quark and gluon jet properties in symmetric three jet events

The ALEPH collaboration Buskulic, D. ; Casper, D. ; De Bonis, I. ; et al.
Phys.Lett. B384 (1996) 353-364, 1996.
Inspire Record 404562 DOI 10.17182/hepdata.48015
2 data tables

B-jets are identified with the lepton-tag analysis.

The same kinematics as in the table 1.


Evolution of e p fragmentation and multiplicity distributions in the Breit frame

The H1 collaboration Adloff, C. ; Aid, S. ; Anderson, M. ; et al.
Nucl.Phys. B504 (1997) 3-23, 1997.
Inspire Record 445116 DOI 10.17182/hepdata.44587

Low x deep-inelastic ep scattering data, taken in 1994 at the H1 detector at HERA, are analysed in the Breit frame of reference. The evolution of the peak and width of the current hemisphere fragmentation function is presented as a function of Q and compared with e+e- results at equivalent centre of mass energies. Differences between the average charged multiplicity and the multiplicity of e+e- annihilations at low energies are analysed. Invariant energy spectra are compared with MLLA predictions. Distributions of multiplicity are presented as functions of Bjorken-x and Q^2, and KNO scaling is discussed.

25 data tables

The current hemisphere fragmentation as a function of XP in the Breit frame.

The current hemisphere fragmentation as a function of LN(1/XP) in the Breitframe.

Current hemisphere fragmentation as a function of Q for the XP range 0.02 to 0.05, to show scaling violations.

More…

First observation of inclusive B decays to the charmed strange baryons Xi(c)0 and Xi(c)+

The CLEO collaboration Barish, B. ; Chadha, M. ; Chan, S. ; et al.
Phys.Rev.Lett. 79 (1997) 3599-3603, 1997.
Inspire Record 442910 DOI 10.17182/hepdata.47081

Using data collected in the region of the Upsilon(4S) resonance with the CLEO II detector operating at the Cornell Electron Storage Ring CESR, we present the first observation of B mesons decaying into the charmed strange baryons Xi_c0 and Xi_c+. We find 79 +/- 27 Xi_c0 and 125 +/- 28 Xi_c+ candidates from B decays, leading to product branching fractions of BR(Bbar -> Xi_c0 X)BR(Xi_c0 -> Xi- pi+) = (0.144 +/- 0.048 +/- 0.021) x 10~-3 and BR(Bbar -> Xi_c+ X)BR(Xi_c+ -> Xi- pi+ pi+) = (0.453 +/- 0.096 +0.085-0.065) x 10~-3.

2 data tables

Charge conjugated states are included. P(P=4,C=MAX) equals sqrt(Ebeam**2 - m(XI/C)**2). The kinematic limit is : (P(XI/C) / P(P=4,C=MAX)) < 0.5.

Charge conjugated states are included. P(P=4,C=MAX) equals sqrt(Ebeam**2 - m(XI/C)**2). The kinematic limit is : (P(XI/C) / P(P=4,C=MAX)) < 0.5.


A Study of the fragmentation of quarks in e- p collisions at HERA

The H1 collaboration Aid, S. ; Andreev, V. ; Andrieu, B. ; et al.
Nucl.Phys. B445 (1995) 3-21, 1995.
Inspire Record 394793 DOI 10.17182/hepdata.44978

Deep inelastic scattering (DIS) events, selected from 1993 data taken by the H1 experiment at HERA, are studied in the Breit frame of reference. The fragmentation function of the quark is compared with those of \ee data. It is shown that certain aspects of the quarks emerging from within the proton in \ep interactions are essentially the same as those of quarks pair-created from the vacuum in \ee annihilation. The measured area, peak position and widthof the fragmentation function show that the kinematic evolution variable, equivalent to the \ee squared centre of mass energy, is in the Breit frame the invariant square of the four-momentum transfer. We comment on the extent to which we have evidence for coherence effects in parton showers.

6 data tables

Distribution of the cosine of the Breit frame polar angle for data with the Breit frame energy flow selection. Statistical errors only.

Distribution of the cosine of the Breit frame polar angle for data before the Breit frame energy flow selection. Statistical errors only.

The fragmentation function for the current hemisphere of the Breit frame. Data are Breit frame energy flow selected only. Statistical errors only.

More…

Production of charmed mesons in Z decays

The ALEPH collaboration Buskulic, D. ; De Bonis, I. ; Decamp, D. ; et al.
Z.Phys. C62 (1994) 1-14, 1994.
Inspire Record 363280 DOI 10.17182/hepdata.48368
4 data tables

No description provided.

The DSYS error is due to the error in the branching ratio.

The DSYS error is due to the error in the branching ratio.

More…

A Measurement of D meson production in Z0 hadronic decays

The DELPHI collaboration Abreu, P. ; Adam, W. ; Adye, T. ; et al.
Z.Phys. C59 (1993) 533-546, 1993.
Inspire Record 356732 DOI 10.17182/hepdata.14375
6 data tables

Using full data sample.

Using full data sample with proper time > 1 ps to enrich (b bbar) content.

Data with Delta(L) > 1.

More…

A Measurement of the production of D*+- mesons on the Z0 resonance

The OPAL collaboration Akers, R. ; Alexander, G. ; Allison, John ; et al.
Z.Phys. C67 (1995) 27-44, 1995.
Inspire Record 382219 DOI 10.17182/hepdata.48317
5 data tables

No description provided.

Multiplicity data uncorrected for decay branching ratios.

No description provided.

More…

Jet Fragmentation and {QCD} Models in $e^+ e^-$ Annihilation at $c$.m. Energies Between 12-{GeV} and 41.5-{GeV}

The TASSO collaboration Braunschweig, W. ; Gerhards, R. ; Kirschfink, F.J. ; et al.
Z.Phys. C41 (1988) 359-373, 1988.
Inspire Record 263859 DOI 10.17182/hepdata.15531
11 data tables

The errors include the statistical error and that from the correction procedure.

The errors include the statistical error and that from the correction procedure.

The errors include the statistical error and that from the correction procedure.

More…

Measurement of three jet distributions sensitive to the gluon spin in e+ e- annihilations at S**(1/2) = 91-GeV

The OPAL collaboration Alexander, G. ; Allison, John ; Allport, P.P. ; et al.
Z.Phys. C52 (1991) 543-550, 1991.
Inspire Record 317142 DOI 10.17182/hepdata.14852
4 data tables

Data at Parton level.

Ratio data/(Monte Carlo) at Parton level.

Data at Parton level.. Distribution of Ellis-Karliner angle.

More…

Measurement of XI(c) production in e+ e- annihilation at 10.5-GeV center-of-mass energy

The ARGUS collaboration Albrecht, H. ; Ehrlichmann, H. ; Harder, G. ; et al.
Phys.Lett. B247 (1990) 121-126, 1990.
Inspire Record 296522 DOI 10.17182/hepdata.29678
2 data tables

No description provided.

Data requested from authors.


Production of $\rho^+$, $\rho^-$, $\rho^0$ (770), $\eta$ (550), $\omega(783)$ and F2 (1270) Mesons in Anti-nucleon Neon and Neutrino Neon Charged Current Interactions

The BEBC WA59 collaboration Wittek, W. ; Aderholz, M. ; Allport, P.P. ; et al.
Z.Phys. C44 (1989) 175, 1989.
Inspire Record 278996 DOI 10.17182/hepdata.15079
21 data tables

No description provided.

No description provided.

No description provided.

More…

Study of Hadronic Decays of the $\Z^0$ Boson

The DELPHI collaboration Aarnio, P. ; Abreu, P. ; Adam, W. ; et al.
Phys.Lett. B240 (1990) 271-282, 1990.
Inspire Record 294894 DOI 10.17182/hepdata.49562
13 data tables

Corrected Sphericity distribution. Statistical errors only.

Corrected Aplanarity distribution. Statistical errors only.

Corrected Q3-Q2 distribution. Statistical errors only.

More…

Observation of the Charmed Baryon $\Lambda(c$) in $e^+ e^-$ Annihilation at 10-{GeV}

The ARGUS collaboration Albrecht, H. ; Bockmann, P. ; Glaser, R. ; et al.
Phys.Lett. B207 (1988) 109-114, 1988.
Inspire Record 260826 DOI 10.17182/hepdata.29980
2 data tables

Data requested from authors.

No description provided.


Observation of a New Charmed Meson.

The ARGUS collaboration Albrecht, H. ; Binder, U. ; Harder, G. ; et al.
Phys.Rev.Lett. 56 (1986) 549, 1986.
Inspire Record 222219 DOI 10.17182/hepdata.20225
2 data tables

No description provided.

Estimated production cross section obtained by comparison with observed D*(2010) production rate.


Production and Decay of the F Meson in $e^+ e^-$ Annihilation at 10-{GeV} Center-of-mass Energy

The ARGUS collaboration Albrecht, H. ; Binder, U. ; Drews, G. ; et al.
Phys.Lett. B153 (1985) 343, 1985.
Inspire Record 207949 DOI 10.17182/hepdata.30425
2 data tables

RESULTS OF FITS FOR SPECIFIED DECAY CHANNELS.

ACCEPTANCE CORRECTED FRAGMENTATION FUNCTION FOR THE TWO DECAY CHANNELS COMBINED. X IS PF/PMAX. DATA HAVE BEEN READ FROM THE GRAPH.


Properties of Charm Jets Produced in $e^+ e^-$ Annihilation Near 34-{GeV}

The TASSO collaboration Althoff, M. ; Braunschweig, W. ; Kirschfink, F.J. ; et al.
Phys.Lett. B135 (1984) 243-249, 1984.
Inspire Record 194050 DOI 10.17182/hepdata.30600
2 data tables

THE C-JET IS THE JET IN THE HEMISPHERE OPPOSITE TO THAT CONTAINING THE D* MESON. DIVISION IS MADE BY A PLANE PERPENDICULAR TO THE THRUST AXIS.

No description provided.


Direct Photon Production at the $\psi$

Scharre, D.L. ; Alam, M.S. ; Boyarski, A. ; et al.
Phys.Rev. D23 (1981) 43, 1981.
Inspire Record 153865 DOI 10.17182/hepdata.24079
4 data tables

TOTAL INCLUSIVE PHOTON MOMENTUM SPECTRUM. ERRORS ARE STATISTICAL ONLY.

PHOTON SPECTRUM PREDICTED FROM MEASUREMENT OF THE PI0 AND ETA DISTRIBUTIONS. ERRORS INCLUDE BOTH STATISTICAL AND RELATIVE SYSTEMATIC COMPONENTS.

INCLUSIVE PI0 MOMENTUM DISTRIBUTION. QUOTED ERRORS ARE STATISTICAL ONLY. OVERALL AND RELATIVE SYSTEMATIC ERRORS ARE LESS THAN 30 PCT AND MAY VARY SLOWLY WITH X.

More…

Measurement of High-energy Direct Photons in $\psi$ Decays

Abrams, G.S. ; Alam, M.S. ; Blocker, C.A. ; et al.
Phys.Rev.Lett. 44 (1980) 114, 1980.
Inspire Record 142835 DOI 10.17182/hepdata.20729
1 data table

INCLUSIVE PHOTON AND PI0 MOMENTUM DISTRIBUTION.