HEPData

The multiplicity dependence of the angular and energy characteristics of secondary particles in proton-nucleon collisions at 9 Bevis studied. A comparison is made with results of calculations based on the single-meson scheme.

9 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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Neutral pion production at midrapidity in pp and Pb-Pb collisions at $\sqrt{s_{{\mathrm {NN}}}}= 2.76\,{\mathrm {TeV}}$

The ALICE collaboration Abelev, Betty Bezverkhny ; Adam, Jaroslav ; Adamova, Dagmar ; et al.

Eur.Phys.J. C74 (2014) 3108, 2014.

Inspire Record 1296306 DOI 10.17182/hepdata.30758

Invariant yields of neutral pions at midrapidity in the transverse momentum range $0.6 < p_\mathrm{T}< 12\,{\mathrm \mathrm{GeV}}/$ c measured in Pb–Pb collisions at $\sqrt{s_{\mathrm {NN}}}= 2.76\,{\mathrm {\,}}\mathrm{TeV}$ are presented for six centrality classes. The pp reference spectrum was measured in the range $0.4 < p_\mathrm{T}< 10\,{\mathrm {\,}}\mathrm{GeV}/$ c at the same center-of-mass energy. The nuclear modification factor, $R_\mathrm{{AA}}$ , shows a suppression of neutral pions in central Pb–Pb collisions by a factor of up to about $8{-}10$ for $5 \lesssim p_\mathrm{T}\lesssim 7\,{\mathrm \mathrm{GeV}}/$ c. The presented measurements are compared with results at lower center-of-mass energies and with theoretical calculations.

17 data tables

Table 1

Invariant differential yields of PI0 produced in inelastic pp collisions at center-of-mass energy 2.76 TeV.

Table 2

Invariant differential cross section of PI0 produced in inelastic pp collisions at center-of-mass energy 2.76 TeV, the uncertainty of \sigma_{inel} of 3.9% is not included in the systematic error.

Table 3

Invariant differential yields of PI0 produced in 0-5% central inelastic PbPb collisions at center-of-mass energy per nucleon 2.76 TeV.

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Inclusive double-helicity asymmetries in neutral-pion and eta-meson production in $\vec{p}+\vec{p}$ collisions at $\sqrt{s}=200$ GeV

The PHENIX collaboration Adare, A. ; Aidala, C. ; Ajitanand, N.N. ; et al.

Phys.Rev. D90 (2014) 012007, 2014.

Inspire Record 1282448 DOI 10.17182/hepdata.64716

Results are presented from data recorded in 2009 by the PHENIX experiment at the Relativistic Heavy Ion Collider for the double-longitudinal spin asymmetry, $A_{LL}$, for $\pi^0$ and $\eta$ production in $\sqrt{s} = 200$ GeV polarized $p$$+$$p$ collisions. Comparison of the $\pi^0$ results with different theory expectations based on fits of other published data showed a preference for small positive values of gluon polarization, $\Delta G$, in the proton in the probed Bjorken $x$ range. The effect of adding the new 2009 \pz data to a recent global analysis of polarized scattering data is also shown, resulting in a best fit value $\Delta G^{[0.05,0.2]}_{\mbox{DSSV}} = 0.06^{+0.11}_{-0.15}$ in the range $0.05<x<0.2$, with the uncertainty at $\Delta \chi^2 = 9$ when considering only statistical experimental uncertainties. Shifting the PHENIX data points by their systematic uncertainty leads to a variation of the best-fit value of $\Delta G^{[0.05,0.2]}_{\mbox{DSSV}}$ between $0.02$ and $0.12$, demonstrating the need for full treatment of the experimental systematic uncertainties in future global analyses.

9 data tables

Table 1

PI0 ASYM(LL) measurements from 2005.

Table 2

PI0 ASYM(LL) measurements from 2006.

Table 3

PI0 ASYM(LL) measurements from 2009.

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Inclusive $\pi^0$ Production in $\pi^+ p$, $K^+ p$ and $p p$ Interactions at 250-{GeV}/$c$

The NA22 collaboration Adamus, M. ; Azhinenko, I.V. ; Ataian, M.R. ; et al.

Z.Phys. C35 (1987) 7, 1987.

Inspire Record 240345 DOI 10.17182/hepdata.40897

4 data tables

Table 1

Table 2

Table 3

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Mid-rapidity neutral pion production in proton proton collisions at $\sqrt{s}$ = 200-GeV

The PHENIX collaboration Adler, S.S. ; Afanasiev, S. ; Aidala, C. ; et al.

Phys.Rev.Lett. 91 (2003) 241803, 2003.

Inspire Record 617784 DOI 10.17182/hepdata.41956

The invariant differential cross section for inclusive neutral pion production in p+p collisions at sqrt(s_NN) = 200 GeV has been measured at mid-rapidity |eta| < 0.35 over the range 1 < p_T <~ 14 GeV/c by the PHENIX experiment at RHIC. Predictions of next-to-leading order perturbative QCD calculations are consistent with these measurements. The precision of our result is sufficient to differentiate between prevailing gluon-to-pion fragmentation functions.

1 data table

Table 1

The invariant differential cross section as a function of PT. The mean PT here is defined as the PT for which the cross section equals its average over thebin.

Production of pi0 and eta mesons at large transverse momenta in pp and p Be interactions at 530-GeV/c and 800-GeV/c

The Fermilab E706 collaboration Apanasevich, L. ; Bacigalupi, J. ; Baker, W. ; et al.

Phys.Rev. D68 (2003) 052001, 2003.

Inspire Record 585866 DOI 10.17182/hepdata.11186

We present results on the production of high transverse momentum pizero and eta mesons in pp and pBe interactions at 530 and 800 GeV/c. The data span the kinematic ranges: 1 < p_T < 10 GeV/c in transverse momentum and 1.5 units in rapidity. The inclusive pizero cross sections are compared with next-to-leading order QCD calculations and to expectations based on a phenomenological parton-k_T model.

21 data tables

Table 1

Invariant differetrial cross sections/nucleon for the inclusive reaction p Be --> pi0 X at 530 and 800 GEV, averaged over the c.m. rapidity interval -0.75 to 0.75 and -1.0 to 0.5 respectively.

Table 2

Invariant differetrial cross sections/nucleon for the inclusive reaction p p --> pi0 X at 530 and 800 GEV, averaged over the c.m. rapidity interval -0.75 to 0.75 and -1.0 to 0.5 respectively.

Table 3

The averaged invariant differential cross section/nucleon as a function of rapidity in the PT intervals 1.0-1.5, 1.5-2.0 and 2.0-2.5 GeV for the inclusive reaction p BE --> pi0 X at 530 and 800 GeV GeV.

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Observation of pi0 mesons with large transverse momentum in high-energy proton proton collisions

Busser, F.W. ; Camilleri, L. ; di Lella, L. ; et al.

Phys.Lett. B46 (1973) 471-476, 1973.

Inspire Record 83673 DOI 10.17182/hepdata.28041

5 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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Single spin asymmetries and invariant cross-sections of the high transverse momentum inclusive pi0 production in 200-GeV/c p p and anti-p p interactions

The FNAL E704 collaboration Adams, D.L. ; Akchurin, N. ; Belikov, N.I. ; et al.

Phys.Rev. D53 (1996) 4747-4755, 1996.

Inspire Record 382392 DOI 10.17182/hepdata.40544

3 data tables

Table 1

No description provided.

Table 2

Pure inclusive reaction.

Table 3

Semi-inclusive reaction where at least on associated charged particle is produced at (180+-30) degrees relative to the pi0.

Spin Dependence of the Inclusive Reaction $p p$ (Polarized) $\to \pi^0 X$ at 24-{GeV}/$c$ for High $p_T \pi^0$ Produced in the Central Region

Antille, J. ; Dick, L. ; Madansky, L. ; et al.

Phys.Lett. B94 (1980) 523-526, 1980.

Inspire Record 153785 DOI 10.17182/hepdata.27175

1 data table

Table 1

No description provided.

Large x(F) spin asymmetry in pi0 production by 200-GeV polarized protons

The E581 & E704 collaborations Adams, D.L. ; Akchurin, N. ; Belikov, N.I. ; et al.

Z.Phys. C56 (1992) 181-184, 1992.

Inspire Record 314230 DOI 10.17182/hepdata.14557

5 data tables

Table 1

No description provided.

Table 2

False asymmetry calculated for events with average beam polarization of zero.

Table 3

No description provided.

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Hadron production in nucleon-nucleon collisions at 200-GeV/c: A Compilation

Gazdzicki, M. ; Hansen, O. ;

Nucl.Phys. A528 (1991) 754-770, 1991.

Inspire Record 323125 DOI 10.17182/hepdata.36760

13 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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gamma production in p Ne-20 and p N interactions at 300-GeV

Yuldashev, B.S. ; Aliev, Sh.M. ; Alimov, M.A. ; et al.

Phys.Rev. D43 (1991) 2803-2814, 1991.

Inspire Record 299846 DOI 10.17182/hepdata.22850

Data on the multiplicity and inclusive spectra of γ produced in inelastic pNe20 and pN interactions at 300 GeV are presented. The γ multiplicity for pNe20 interactions is 11.43±0.23, and the ratio of 〈nγ〉 for pNe20 and pN interactions is 1.48±0.05. From an analysis of the effective-mass distributions, 〈nπ0〉=4.91±0.52 and 〈nη0〉=1.47±0.33. In fact, η0 production is much higher in pNe20 interactions [R(η0π0)=0.66±0.12 for np≥21] than in pN interactions [R(η0π0)=0.06±0.04]. No η′(958) signal is seen. Strong correlations between 〈nγ〉 and np, the number of secondary protons, are observed, primarily from the central and target fragmentation regions. Inclusive y* and p⊥ spectra are analyzed and evidence for low-energy cascading and rescattering of fast particles in the projectile fragmentation region is discussed. The data are compared to the predictions of the additive quark model, the Lund model, and the dual parton model.

9 data tables

Table 1

No description provided.

Table 2

GAMMA-MULTIPLICITY FOR (PROTON-NUCLEON)-INTERACTION WAS OBTAINED AT AVERAGING OVER (PP) AND (PN) EVENTS, AND THEN WAS USED IN THE PRESENTED RATIO.

Table 3

No description provided.

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Analyzing power in inclusive pi+ and pi- production at high x(F) with a 200-GeV polarized proton beam

The FNAL-E704 collaboration Adams, D.L. ; Akchurin, N. ; Belikov, N.I. ; et al.

Phys.Lett. B264 (1991) 462-466, 1991.

Inspire Record 315569 DOI 10.17182/hepdata.29360

7 data tables

Table 1

Integrated over all PT.

Table 2

Integrated over all PT.

Table 3

No description provided.

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High x(t) single spin asymmetry in pi0 and eta production at x(F) = 0 by 200-GeV polarized anti-protons and protons

The E581 & E704 collaborations Adams, D.L. ; Akchurin, N. ; Belikov, N.I. ; et al.

Phys.Lett. B276 (1992) 531-535, 1992.

Inspire Record 314231 DOI 10.17182/hepdata.29252

3 data tables

Table 1

Statistical errors only.

Table 2

Statistical errors only.

Table 3

Statistical errors only.

Comparison of spin asymmetries and cross-sections in pi0 production by 200-GeV polarized anti-protons and protons

The E581 & E704 collaborations Adams, D.L. ; Akchurin, N. ; Belikov, N.I. ; et al.

Phys.Lett. B261 (1991) 201-206, 1991.

Inspire Record 314232 DOI 10.17182/hepdata.29396

4 data tables

Table 1

No description provided.

Table 2

P P data are taken from Adams et al, Fermilab-Pub-91/13-E.

Table 3

Ratio of the spin averaged invariant cross section for PI0 production in p p and pbar p interactions.

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First results for the two spin parameter A(LL) in pi0 production by 200-GeV polarized protons and anti-protons

The E581 & E704 collaborations Adams, D.L. ; Akchurin, N. ; Belikov, N.I. ; et al.

Phys.Lett. B261 (1991) 197-200, 1991.

Inspire Record 314233 DOI 10.17182/hepdata.29385

1 data table

Table 1

No description provided.

Direct Photon Production at the {CERN} {ISR}

The CMOR collaboration Angelis, A.L.S. ; Basini, G. ; Besch, H.J. ; et al.

Nucl.Phys. B327 (1989) 541-568, 1989.

Inspire Record 279988 DOI 10.17182/hepdata.33181

3 data tables

Table 1

Final Average Results from inside and outside detector.

Table 2

Results for the inside detector.

Table 3

Results for the outside detector.

High $p_T \gamma$ and $\pi^0$ Production, Inclusive and With a Recoil Hadronic Jet, in $p p$ Collisions at $\sqrt{s}=63$-{GeV}

The Axial Field Spectrometer collaboration Akesson, T. ; Albrow, M.G. ; Almehed, S. ; et al.

Sov.J.Nucl.Phys. 51 (1990) 836-845, 1990.

Inspire Record 281284 DOI 10.17182/hepdata.48816

3 data tables

Table 1

Errors are combined statistical and systematic.

Table 2

Errors are combined statistical and systematic.

Table 3

Errors are combined statistical and systematic.

Analyzing Power Measurement in Inclusive pi0 Production at High x(f)

Bonner, B.E. ; Buchanan, J.A. ; Carey, D.C. ; et al.

Phys.Rev.Lett. 61 (1988) 1918, 1988.

Inspire Record 269386 DOI 10.17182/hepdata.2928

7 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

Individual polarisation measurements.

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Analysis of Transverse Momentum Distributions for $p p$ Interactions at 360-{GeV}/$c$ in the Framework of a Quark - Diquark Fragmentation Model

The EHS-RCBC collaboration Bailly, J.L. ; Bartl, W. ; Batunin, A. ; et al.

Z.Phys. C35 (1987) 295, 1987.

Inspire Record 245106 DOI 10.17182/hepdata.15802

1 data table

Table 1

No description provided.

Production of High Transverse Momentum Prompt Photons and Neutral Pions in Proton Proton Interactions at 280-GeV/c

The WA70 collaboration Bonesini, M. ; Bonvin, E. ; Booth, P.S.L. ; et al.

Z.Phys. C38 (1988) 371, 1988.

Inspire Record 252633 DOI 10.17182/hepdata.15647

6 data tables

Table 1

Invariant cross section.

Table 2

No description provided.

Table 3

Invariant cross section.

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A Measurement of $\pi^0$ Production at Large Transverse Momentum in $\pi^- p$, $\pi^+ p$ and $p p$ Collisions at 300-{GeV}/$c$

The NA24 collaboration De Marzo, C. ; De Palma, M. ; Favuzzi, C. ; et al.

Phys.Rev. D36 (1987) 16, 1987.

Inspire Record 236249 DOI 10.17182/hepdata.23354

1 data table

Table 1

THERE IS ALSO A 1 PCT UNCERTAINTY IN THE PT SCALE AND A 7 PCT UNCERTAINTY IN THE NORMALISATION.

Date

Collaboration

Subject_areas

Phrases

Reactions Reset

Observables

Cmenergies

Authors

Inclusive particle production in 400-GeV/c p p interactions

Inclusive $\pi^0$ and $\eta$ Production From Kaon, Proton and Anti-proton Beams in the Triple Regge Region

Production of gamma Quanta at Inelastic p 20-Ne and p n Interactions at 300 GeV

Inelastic Interaction of Protons and Nucleons at an Energy of 9 BeV

Neutral pion production at midrapidity in pp and Pb-Pb collisions at $\sqrt{s_{{\mathrm {NN}}}}= 2.76\,{\mathrm {TeV}}$

Inclusive double-helicity asymmetries in neutral-pion and eta-meson production in $\vec{p}+\vec{p}$ collisions at $\sqrt{s}=200$ GeV

Inclusive $\pi^0$ Production in $\pi^+ p$, $K^+ p$ and $p p$ Interactions at 250-{GeV}/$c$

Mid-rapidity neutral pion production in proton proton collisions at $\sqrt{s}$ = 200-GeV

Production of pi0 and eta mesons at large transverse momenta in pp and p Be interactions at 530-GeV/c and 800-GeV/c

Observation of pi0 mesons with large transverse momentum in high-energy proton proton collisions

Single spin asymmetries and invariant cross-sections of the high transverse momentum inclusive pi0 production in 200-GeV/c p p and anti-p p interactions

Spin Dependence of the Inclusive Reaction $p p$ (Polarized) $\to \pi^0 X$ at 24-{GeV}/$c$ for High $p_T \pi^0$ Produced in the Central Region

Large x(F) spin asymmetry in pi0 production by 200-GeV polarized protons

Hadron production in nucleon-nucleon collisions at 200-GeV/c: A Compilation

gamma production in p Ne-20 and p N interactions at 300-GeV

Analyzing power in inclusive pi+ and pi- production at high x(F) with a 200-GeV polarized proton beam

High x(t) single spin asymmetry in pi0 and eta production at x(F) = 0 by 200-GeV polarized anti-protons and protons

Comparison of spin asymmetries and cross-sections in pi0 production by 200-GeV polarized anti-protons and protons

First results for the two spin parameter A(LL) in pi0 production by 200-GeV polarized protons and anti-protons

Direct Photon Production at the {CERN} {ISR}

High $p_T \gamma$ and $\pi^0$ Production, Inclusive and With a Recoil Hadronic Jet, in $p p$ Collisions at $\sqrt{s}=63$-{GeV}

Analyzing Power Measurement in Inclusive pi0 Production at High x(f)

Analysis of Transverse Momentum Distributions for $p p$ Interactions at 360-{GeV}/$c$ in the Framework of a Quark - Diquark Fragmentation Model

Production of High Transverse Momentum Prompt Photons and Neutral Pions in Proton Proton Interactions at 280-GeV/c

A Measurement of $\pi^0$ Production at Large Transverse Momentum in $\pi^- p$, $\pi^+ p$ and $p p$ Collisions at 300-{GeV}/$c$