Date

Collaboration

Transverse-momentum-dependent Multiplicities of Charged Hadrons in Muon-Deuteron Deep Inelastic Scattering

The COMPASS collaboration Aghasyan, M. ; Alexeev, M.G. ; Alexeev, G.D. ; et al.
Phys.Rev. D97 (2018) 032006, 2018.
Inspire Record 1624692 DOI 10.17182/hepdata.83542

A semi-inclusive measurement of charged hadron multiplicities in deep inelastic muon scattering off an isoscalar target was performed using data collected by the COMPASS Collaboration at CERN. The following kinematic domain is covered by the data: photon virtuality Q2>1  (GeV/c)2, invariant mass of the hadronic system W>5  GeV/c2, Bjorken scaling variable in the range 0.003<x<0.4, fraction of the virtual photon energy carried by the hadron in the range 0.2<z<0.8, and square of the hadron transverse momentum with respect to the virtual photon direction in the range 0.02  (GeV/c)2<PhT2<3  (GeV/c)2. The multiplicities are presented as a function of PhT2 in three-dimensional bins of x, Q2, z and compared to previous semi-inclusive measurements. We explore the small-PhT2 region, i.e. PhT2<1  (GeV/c)2, where hadron transverse momenta are expected to arise from nonperturbative effects, and also the domain of larger PhT2, where contributions from higher-order perturbative QCD are expected to dominate. The multiplicities are fitted using a single-exponential function at small PhT2 to study the dependence of the average transverse momentum ⟨PhT2⟩ on x, Q2 and z. The power-law behavior of the multiplicities at large PhT2 is investigated using various functional forms. The fits describe the data reasonably well over the full measured range.

162 data tables
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Charged-particle pseudorapidity density at mid-rapidity in p-Pb collisions at $\sqrt{s_{\rm{NN}}}$ = 8.16 TeV

The ALICE collaboration Acharya, Shreyasi ; Torales - Acosta, Fernando ; Adamova, Dagmar ; et al.
Eur.Phys.J. C79 (2019) 307, 2019.
Inspire Record 1706753 DOI 10.17182/hepdata.89268

The pseudorapidity density of charged particles, $\rm{d}\it{N}_\rm{ch}/\rm{d}\it{\eta}$, in p-Pb collisions has been measured at a centre-of-mass energy per nucleon-nucleon pair of $\sqrt{s_{\rm{NN}}}$ = 8.16 TeV at mid-pseudorapidity for non-single-diffractive events. The results cover 3.6 units of pseudorapidity, $|\eta|<1.8$. The $\rm{d}\it{N}_\rm{ch}/\rm{d}\it{\eta}$ value is $19.1\pm0.7$ at $|\eta|<0.5$. This quantity divided by $\langle N_\rm{part} \rangle/2$, is $4.73\pm0.20$, which is 9.5% higher than the corresponding value for p-Pb collisions at $\sqrt{s_{\rm{NN}}}$ = 5.02 TeV. Measurements are compared with models based on different mechanisms for particle production. All models agree within uncertainties with data in the Pb-going side, while HIJING overestimates, showing a symmetric behaviour, and EPOS underestimates the p-going side of the $\rm{d}\it{N}_\rm{ch}/\rm{d}\it{\eta}$ distribution. Saturation-based models reproduce the distributions well for $\eta>-1.3$. The $\rm{d}\it{N}_\rm{ch}/\rm{d}\it{\eta}$ is also measured for different centrality estimators, based both on the charged-particle multiplicity and on the energy deposited in the Zero-Degree Calorimeters. A study of the implications of the large multiplicity fluctuations due to the small number of participants for systems like p-Pb in the centrality calculation for multiplicity-based estimators is discussed, demonstrating the advantages of determining the centrality with energy deposited near beam rapidity.

29 data tables

Pseudorapidity density of charged particles in p–Pb NSD collisions at a centre-of-mass energy of 8.16 TeV.

Values of average pseudorapidity density of charged particles in p–Pb NSD collisions as a function of the energy in the centre-of-mass.

Pseudorapidity density of charged particles in p–Pb NSD collisions at 8.16 TeV for 0-5% centrality class and CL1 estimator.

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Charged-particle multiplicity distributions over a wide pseudorapidity range in proton-proton collisions at $\mathbf{\sqrt{s}=}$ 0.9, 7 and 8 TeV

The ALICE collaboration
No Journal Information, 2017.
Inspire Record 1614477 DOI 10.17182/hepdata.78802

We present the charged-particle multiplicity distributions over a wide pseudorapidity range ($-3.4<\eta<5.0$) for pp collisions at $\sqrt{s}=$ 0.9, 7, and 8 TeV at the LHC. Results are based on information from the Silicon Pixel Detector and the Forward Multiplicity Detector of ALICE, extending the pseudorapidity coverage of the earlier publications and the high-multiplicity reach. The measurements are compared to results from the CMS experiment and to PYTHIA, PHOJET and EPOS LHC event generators, as well as IP-Glasma calculations.

90 data tables

Multiplicity distribution in the pseudorapidity region -2.0 to 2.0 for NSD collisions at a centre-of-mass energy of 900 GeV.

Multiplicity distribution in the pseudorapidity region -2.4 to 2.4 for NSD collisions at a centre-of-mass energy of 900 GeV.

Multiplicity distribution in the pseudorapidity region -3.0 to 3.0 for NSD collisions at a centre-of-mass energy of 900 GeV.

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Multiplicities of charged kaons from deep-inelastic muon scattering off an isoscalar target

The COMPASS collaboration Adolph, C. ; Agarwala, J. ; Aghasyan, M. ; et al.
Phys.Lett. B767 (2017) 133-141, 2017.
Inspire Record 1483098 DOI 10.17182/hepdata.77892

Precise measurements of charged-kaon multiplicities in deep inelastic scattering were performed. The results are presented in three-dimensional bins of the Bjorken scaling variable x, the relative virtual-photon energy y, and the fraction z of the virtual-photon energy carried by the produced hadron. The data were obtained by the COMPASS Collaboration by scattering 160 GeV muons off an isoscalar 6 LiD target. They cover the kinematic domain 1 (GeV/c)2 < Q2 < 60 (GeV/c)^2 in the photon virtuality, 0.004 < x < 0.4, 0.1 < y < 0.7, 0.20 < z < 0.85, and W > 5 GeV/c^2 in the invariant mass of the hadronic system. The results from the sum of the z-integrated K+ and K- multiplicities at high x point to a value of the non-strange quark fragmentation function larger than obtained by the earlier DSS fit.

2 data tables

Multiplicities of positively charged kaons from semi-inclusive deep-inelastic scattering of muons off an isoscalar target, $M^{K^{+}}$, in bins of $x$, $y$, and $z$. Also given are the diffractive vector meson correction to the kaon count, $DVM^{K^{+}}$, and DIS count, $DVM^{DIS}$, as well as the radiative correction factors to the kaon count, $\eta^{K^{+}}$, and DIS count, $\eta^{DIS}$. The correction factors were applied to the raw multiplicity to arrive at the final multiplicity given in the table, $M^{K^{+}}$, as follows: $M^{K^{+}}$ = $M_{raw}^{K^{+}}$ * $\frac{\eta^{K^{+}}} {\eta^{DIS}}$ * $\frac{ DVM^{K^{+}} } {DVM^{DIS} }$.

Multiplicities of negatively charged kaons from semi-inclusive deep-inelastic scattering of muons off an isoscalar target, $M^{K^{-}}$, in bins of $x$, $y$, and $z$. Also given are the diffractive vector meson correction to the kaon count, $DVM^{K^{-}}$, and DIS count, $DVM^{DIS}$, as well as the radiative correction factors to the kaon count, $\eta^{K^{-}}$, and DIS count, $\eta^{DIS}$. The correction factors were applied to the raw multiplicity to arrive at the final multiplicity given in the table, $M^{K^{-}}$, as follows: $M^{K^{-}}$ = $M_{raw}^{K^{-}}$ * $\frac{\eta^{K^{-}}} {\eta^{DIS}}$ * $\frac{ DVM^{K^{-}} } {DVM^{DIS} }$.


Multiplicities of charged pions and charged hadrons from deep-inelastic scattering of muons off an isoscalar target

The COMPASS collaboration Adolph, C. ; Agarwala, J. ; Aghasyan, M. ; et al.
Phys.Lett. B764 (2017) 1-10, 2017.
Inspire Record 1444985 DOI 10.17182/hepdata.76800

Multiplicities of charged pions and unidentified hadrons produced in deep-inelastic scattering were measured in bins of the Bjorken scaling variable $x$, the relative virtual-photon energy $y$ and the relative hadron energy $z$. Data were obtained by the COMPASS Collaboration using a 160 GeV muon beam and an isoscalar target ($^6$LiD). They cover the kinematic domain in the photon virtuality $Q^2$ > 1(GeV/c$)^2$, $0.004 < x < 0.4$, $0.2 < z < 0.85$ and $0.1 < y < 0.7$. In addition, a leading-order pQCD analysis was performed using the pion multiplicity results to extract quark fragmentation functions.

4 data tables

Multiplicities of positively charged pions from semi-inclusive deep-inelastic scattering of muons off an isoscalar target, $M^{\pi^{+}}$, in bins of $x$, $y$, and $z$. Also given are the diffractive vector meson correction to the pion count, $DVM^{\pi^{+}}$, and DIS count, $DVM^{DIS}$, as well as the radiative correction factors to the pion count, $\eta^{\pi^{+}}$, and DIS count, $\eta^{DIS}$. The correction factors were applied to the raw multiplicity to arrive at the final multiplicity given in the table, $M^{\pi^{+}}$, as follows: $M^{\pi^{+}}$ = $M_{raw}^{\pi^{+}}$ * $\frac{\eta^{\pi^{+}}} {\eta^{DIS}}$ * $\frac{ DVM^{\pi^{+}} } {DVM^{DIS} }$.

Multiplicities of negatively charged pions from semi-inclusive deep-inelastic scattering of muons off an isoscalar target, $M^{\pi^{-}}$, in bins of $x$, $y$, and $z$. Also given are the diffractive vector meson correction to the pion count, $DVM^{\pi^{-}}$, and DIS count, $DVM^{DIS}$, as well as the radiative correction factors to the pion count, $\eta^{\pi^{-}}$, and DIS count, $\eta^{DIS}$. The correction factors were applied to the raw multiplicity to arrive at the final multiplicity given in the table, $M^{\pi^{-}}$, as follows: $M^{\pi^{-}}$ = $M_{raw}^{\pi^{-}}$ * $\frac{\eta^{\pi^{-}}} {\eta^{DIS}}$ * $\frac{ DVM^{\pi^{-}} } {DVM^{DIS} }$.

Multiplicities of unidentified positively charged hadrons from semi-inclusive deep-inelastic scattering of muons off an isoscalar target, $M^{h^{+}}$, in bins of $x$, $y$, and $z$. Also given are the diffractive vector meson correction to the hadron count, $DVM^{h^{+}}$, and DIS count, $DVM^{DIS}$, as well as the radiative correction factors to the hadron count, $\eta^{h^{+}}$, and DIS count, $\eta^{DIS}$. The correction factors were applied to the raw multiplicity to arrive at the final multiplicity given in the table, $M^{h^{+}}$, as follows: $M^{h^{+}}$ = $M_{raw}^{h^{+}}$ * $\frac{\eta^{h^{+}}} {\eta^{DIS}}$ * $\frac{ DVM^{h^{+}} } {DVM^{DIS} }$.

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Charged-particle distributions at low transverse momentum in $\sqrt{s} = 13$  TeV pp interactions measured with the ATLAS detector at the LHC

The ATLAS collaboration Aaboud, Morad ; Aad, Georges ; Abbott, Brad ; et al.
Eur.Phys.J. C76 (2016) 502, 2016.
Inspire Record 1467230 DOI 10.17182/hepdata.73907
10 data tables

The average charged-particle muliplicity per unit of rapidity for ETARAP=0 as a function of the centre-of-mass energy.

The extrapolated ($\tau > 30$ ps) average charged-particle muliplicity per unit of rapidity for ETARAP=0 as a function of the centre-of-mass energy.

Charged-particle multiplicities in proton-proton collisions at a centre-of mass energy of 13000 GeV as a function of pseudorapidity for events with the number of charged particles >=2 having transverse momentum >100 MeV and absolute(pseudorapidity) <2.5.

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Interactions of ultrarelativistic oxygen nuclei in emulsion

El-Nadi, M. ; El-Nagdy, M.S. ; Abd-Alla, A.M. ;
Phys.Rev. C48 (1993) 870-876, 1993.
Inspire Record 363778 DOI 10.17182/hepdata.4987
6 data tables

NUCLEUS - AVERAGE NUCLEI OF EMULSION.

NUCLEUS - AVERAGE NUCLEI OF EMULSION.

NUCLEUS - AVERAGE NUCLEI OF EMULSION.

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FAST TARGET FRAGMENTS IN INTERACTIONS OF RELATIVISTIC NUCLEI WITH PHOTOEMULSION. (IN RUSSIAN)

Antonchik, V.A. ; Bakaev, V.A. ; Bogdanov, V.G. ; et al.
Yad.Fiz. 46 (1987) 1344-1352, 1987.
Inspire Record 256945 DOI 10.17182/hepdata.2434
38 data tables

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Central Collisions of 14.6-{GeV}/nucleon, 60-{GeV}/nucleon, and 200-{GeV}/nucleon $^{16}$O Nuclei in Nuclear Emulsion

Barbier, L.M. ; Freier, P.S. ; Holynski, R. ; et al.
Phys.Rev.Lett. 60 (1988) 405-407, 1988.
Inspire Record 264260 DOI 10.17182/hepdata.2969

Central collisions of O16 nuclei with the Ag107 and Br80 nuclei in nuclear emulsion at 14.6, 60, and 200 GeV/nucleon are compared with proton-emulsion data at equivalent energies. The multiplicities of produced charged secondaries are consistent with the predictions of superposition models. At 200 GeV/nucleon the central particle pseudorapidity density is 58±2 for those events with multiplicities exceeding 200 particles.

5 data tables

Nucleus is average nucleus of BR-2 emulsion.

Nucleus is average nucleus of BR-2 emulsion.

Nucleus is average AG107/BR80 nucleus of BR-2 emulsion.

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MULTIPLICITY OF CHARGED AND NEUTRAL PARTICLES IN PI- C-12 INTERACTIONS AT 4-GEV/C. (IN RUSSIAN)

Ismatova, F.A. ; Artykov, Kh.Kh. ; Edgorov, S.O. ; et al.
Yad.Fiz. 43 (1986) 924-930, 1986.
Inspire Record 238224 DOI 10.17182/hepdata.2550
13 data tables

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Local particle densities and global multiplicities in central heavy ion interactions at 3.7-A/GeV, 14.6-A/GeV, 60-A/GeV and 200-A/GeV

The EMU01 collaboration Adamovich, M.I. ; Aggarwal, M.M. ; Alexandrov, Y.A. ; et al.
Z.Phys. C56 (1992) 509-520, 1992.
Inspire Record 334794 DOI 10.17182/hepdata.9290
4 data tables

No description provided.

NUCLEUS IS AGBR, CENTRAL EVENTS.

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THE STUDY OF FAST NEUTRON PRODUCTION (P(n) >= 1-GeV/c) IN p p AND p C-12 INTERACTIONS AT P(p) = 4.2-GeV/c

Bekmirzaev, R.N. ; Grishin, V.G. ; Grishina, O.V. ; et al.
Sov.J.Nucl.Phys. 49 (1989) 637-639, 1989.
Inspire Record 253442 DOI 10.17182/hepdata.9459
5 data tables

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CHARACTERISTICS OF FAST SECONDARY NEUTRONS IN p p AND p C-12 INTERACTIONS AT P = 10-GeV/c

Bekmirzaev, R.N. ; Grishin, V.G. ; Dolejsi, J. ; et al.
No Journal Information, 1987.
Inspire Record 251572 DOI 10.17182/hepdata.9496
3 data tables

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Charged particle multiplicities in nuclear collisions at 200-GeV/N

The NA35 collaboration Baechler, J. ; Bartke, J. ; Bialkowska, H. ; et al.
Z.Phys. C51 (1991) 157-162, 1991.
Inspire Record 320907 DOI 10.17182/hepdata.14983
4 data tables

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STUDY OF THE RESONANCE PRODUCTION IN anti-n p INTERACTIONS AT 6.1-GeV/c

The Dubna-Moscow-Bucharest-Kosice-Sofiya collaboration Batyunya, B.V. ; Boguslavsky, I.V. ; Bruncko, D. ; et al.
Sov.J.Nucl.Phys. 47 (1988) 468, 1988.
Inspire Record 246882 DOI 10.17182/hepdata.9876
9 data tables

No description provided.

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Comparison of Strange Anti-baryon and Strange Meson Production in $K^+ p$ Interactions at 32-{GeV}/$c$

Chliapnikov, P.V. ; Gerdyukov, L.N. ; Khromova, G.N. ; et al.
Z.Phys. C12 (1982) 99, 1982.
Inspire Record 167341 DOI 10.17182/hepdata.10880
32 data tables

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CROSS-SECTION OF PARTICLE DIFFRACTIVE PRODUCTION IN ANTI-P P INTERACTIONS AT 32-GEV/C. (IN RUSSIAN)

Bogolyubsky, M.Yu. ; Borovikov, A.A. ; Bravina, L.V. ; et al.
Yad.Fiz. 46 (1987) 522-530, 1987.
Inspire Record 255691 DOI 10.17182/hepdata.2402
8 data tables

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Study of Neutral Strange Particle Production in $p p$ Interactions at 32-{GeV}/$c$ and Comparison With $\bar{p} p$ Data

Bogolyubsky, M.Yu. ; Bumazhnov, V.A. ; Kiryunin, A.E. ; et al.
Sov.J.Nucl.Phys. 50 (1989) 424, 1989.
Inspire Record 269294 DOI 10.17182/hepdata.10310
15 data tables

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Inclusive Strange Particle Production in $\pi^+ p$ Interactions at 32-{GeV}/$c$

Azhinenko, I.V. ; Belokopytov, Yu.A. ; Borovikov, A.A. ; et al.
Nucl.Phys. B165 (1980) 1-18, 1980.
Inspire Record 141734 DOI 10.17182/hepdata.8000
12 data tables

No description provided.

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DELTA++ AND ANTI-DELTA++ PRODUCTION IN 100-GEV/C ANTI-P P INTERACTIONS.

Ward, D.R. ; Ansorge, R.E. ; Bust, C.P. ; et al.
Nucl.Phys. B141 (1978) 203-219, 1978.
Inspire Record 132549 DOI 10.17182/hepdata.8291
5 data tables

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Study of the Inclusive Reaction $K^+ p \to \Delta^{++}$ (1236) X0 at 32-{GeV}/$c$

The French-Soviet & CERN-Soviet collaborations Chliapnikov, P.V. ; Gorbunov, P.A. ; Klimenko, S.V. ; et al.
Nucl.Phys. B164 (1980) 189-213, 1980.
Inspire Record 141735 DOI 10.17182/hepdata.8244
6 data tables

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PRODUCTION OF K*+- (1385) AND SIGMA*+- (1385) AND anti-SIGMA*+- (1385) RESONANCES IN pi- p INTERACTIONS AT 40-GeV/c

Kladnitskaya, E.N. ; Popova, V.M. ; Toneeva, G.P. ;
Sov.J.Nucl.Phys. 38 (1983) 75, 1983.
Inspire Record 181383 DOI 10.17182/hepdata.9946
7 data tables

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Inclusive $K^{*+}$(1430), $K^{*0}$(1430) and $F(1270)$ Production in $K^+ p$ Interactions at 32-{GeV}/$c$

Chliapnikov, P.V. ; Falaleev, V.P. ; Gerdyukov, L.N. ; et al.
Z.Phys. C12 (1982) 113, 1982.
Inspire Record 167340 DOI 10.17182/hepdata.10914
21 data tables

MULT FOR THE TENSOR MESONS CALCULATED AS MULT=SIG(RES)/SIG(N<=8), WHERE SIG(N<=8) IS THE SUM OF TOPOLOGICAL CROSS SECTIONS WITH N <= 8.

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Study of Inclusive Production of Boson Resonances in $\bar{p} p$ Interactions at 32-{GeV}/$c$

The French-Soviet & CERN-Soviet collaborations Starchenko, E.A. ; Chekulaev, S.V. ; Galyaev, N.A. ; et al.
Z.Phys. C16 (1983) 181, 1983.
Inspire Record 168177 DOI 10.17182/hepdata.22268
13 data tables

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Inclusive $K^*$+ (892) and $K^*$ (892) Production in $K^+ p$ Interactions at 32-{GeV}/c

The French-Soviet & CERN-Soviet collaborations Azhinenko, I.V. ; Bryzgalov, V.V. ; Gerdyukov, L.N. ; et al.
Z.Phys. C5 (1980) 177, 1980.
Inspire Record 153557 DOI 10.17182/hepdata.71085

Total and semi-inclusive cross sections, longitudinal and transverse momentum distributions and spin density matrix elements of theK*+(892) andK*0(892) produced in the inclusive reactionsK+p→K*+(892)+X andK+p→K*0(892)+X at 32 GeV/c are studied in detail. The inclusive spectra of theK*(892) and their decay products are compared with pion and neutral kaon production. TheK*+(892) andK*+(892) are dominantly produced by kaon fragmentation processes. The dependence of average transverse momentum <pT> vs.x for resonances has been investigated for the first time.

55 data tables

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