Measurement of elastic electroproduction of phi mesons at HERA

The H1 collaboration Adloff, C. ; Andreev, V. ; Andrieu, B. ; et al.
Phys.Lett. B483 (2000) 360-372, 2000.
Inspire Record 526887 DOI 10.17182/hepdata.47016

The elastic electroproduction of phi mesons is studied at HERA with the H1 detector for photon virtualities 1 < Q^2 < 15 GeV^2 and hadronic centre of mass energies 40 < W < 130 GeV. The Q^2 and t dependences of the cross section are extracted (t being the square of the four-momentum transfer to the target proton). When plotted as function of (Q^2 + M_V^2) and scaled by the appropriate SU(5) quark charge factor, the phi meson cross section agrees within errors with the cross sections of the vector mesons V = rho, omega and J/psi. A detailed analysis is performed of the phi meson polarisation state and the ratio of the production cross sections for longitudinally and transversely polarised phi mesons is determined. A small but significant violation of s-channel helicity conservation (SCHC) is observed.

7 data tables

The measured ratio of PHI to RHO0 production.

The cross section for elastic PHI meson electro-production calculated by multiplying the PHI/RHO0 cross section ratio by the RHO0 cross section accurately measured in the earlier H1 publication (EPJ C13,371).

The corrected T distribution of elastic PHI meson production for W around 75 GeV and Q2 in the range 2.5 to 15 GeV**2 (mean = 4.8 GeV**2). Statistical error only.

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Charmonium production in deep inelastic scattering at HERA

The H1 collaboration Adloff, C. ; Andreev, V. ; Andrieu, B. ; et al.
Eur.Phys.J. C10 (1999) 373-393, 1999.
Inspire Record 496430 DOI 10.17182/hepdata.44039

The electroproduction of J/psi and psi(2S) mesons is studied in elastic, quasi-elastic and inclusive reactions for four momentum transfers 2 < Q^2 < 80 GeV^2 and photon-proton centre of mass energies 25 < W < 180 GeV. The data were taken with the H1 detector at the electron proton collider HERA in the years 1995 to 1997. The total virtual photon-proton cross section for elastic J/psi production is measured as a function of Q^2 and W. The dependence of the production rates on the square of the momentum transfer from the proton (t) is extracted. Decay angular distributions are analysed and the ratio of the longitudinal and transverse cross sections is derived. The ratio of the cross sections for quasi-elastic psi(2S) and J/psi meson production is measured as a function of Q^2. The results are discussed in terms of theoretical models based upon perturbative QCD. Differential cross sections for inclusive and inelastic production of J/psi mesons are determined and predictions within two theoretical frameworks are compared with the data, the non-relativistic QCD factorization approach including colour octet and colour singlet contributions, and the model of Soft Colour Interactions.

17 data tables

Cross section for elastic J/PSI photoproduction in W bins.

Cross section for elastic J/PSI photoproduction in W bins.

Cross section for elastic J/PSI photoproduction in W bins.

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Elastic electroproduction of rho mesons at HERA

The H1 collaboration Adloff, C. ; Andreev, V. ; Andrieu, B. ; et al.
Eur.Phys.J. C13 (2000) 371-396, 2000.
Inspire Record 495311 DOI 10.17182/hepdata.44043

The elastic electroproduction of rho mesons is studied at HERA with the H1 detector for a photon virtuality in the range 1 < Q^2 < 60 GeV^2 and for a hadronic centre of mass energy in the range 30 < W < 140 GeV. The shape of the pipi mass distribution in the rho resonance region is measured as a function of Q^2. The full set of rho spin density matrix elements is determined, and evidence is found for a helicity flip amplitude at the level of 8 +- 3 % of the non-flip amplitudes. Measurements are presented of the dependence of the cross section on Q^2, W and t (the four-momentum transfer squared to the proton). They suggest that, especially at large Q^2, the gamma^*p cross section develops a stronger W dependence than that expected from the behaviour of elastic and total hadron-hadron cross sections.

15 data tables

Average values of the spin density matrix elements measured for the 1996 data sample.

Spin density matrix elements measured for 3 Q**2 values for the 1996 data sample.

Spin density matrix elements measured for 3 W values for the 1996 data sample.

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Measurement of the t distribution in diffractive photoproduction at HERA

The ZEUS collaboration Breitweg, J. ; Derrick, M. ; Krakauer, D. ; et al.
Eur.Phys.J. C2 (1998) 237-246, 1998.
Inspire Record 452355 DOI 10.17182/hepdata.44323

Photon diffractive dissociation, $\gamma p \to Xp$, has been studied at HERA with the ZEUS detector using $ep$ interactions where the virtuality $Q^2$ of the exchanged photon is smaller than 0.02 GeV$^2$. The squared four-momentum $t$ exchanged at the proton vertex was determined in the range $0.073<|t|<0.40$ GeV$^2$ by measuring the scattered proton in the ZEUS Leading Proton Spectrometer. In the photon-proton centre-of-mass energy interval $176<W<225$ GeV and for masses of the dissociated photon system $4<M_X<32$ GeV, the $t$ distribution has an exponential shape, $dN/d|t| \propto \exp{(-b|t|)}$, with a slope parameter $b=6.8 \pm 0.9$~(stat.)~$ ^{+1.2}_{-1.1}$~(syst.)~GeV$^{-2}$.

2 data tables

T is the squared four momentum transfer at the proton vertex.

SLOPE of the DN/DT distribution.


Nuclear target diffraction dissociation in pi+ and K+ collisions with Au and Al at 250-GeV/c

The EHS/NA22 collaboration Agababyan, N.M. ; Ataian, M.R. ; Charlet, M. ; et al.
Z.Phys. C72 (1996) 65-70, 1996.
Inspire Record 419049 DOI 10.17182/hepdata.14252
6 data tables

For target-diffractive cross-section.

For target-diffractive cross-section.

Multiplicities for the diffractive system.

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A Measurement of elastic J / psi photoproduction cross-section at fermilab E687

The E687 collaboration Frabetti, P.L. ; Paolone, V.S. ; Yager, P.M. ; et al.
Phys.Lett. B316 (1993) 197-206, 1993.
Inspire Record 359356 DOI 10.17182/hepdata.28834
3 data tables

Data supplied by V. Paolone.

Cross section data using Bethe-Heitler event normalization.

Cross section data using the Beam Gamma Monitor normalization.


A Precise measurement of the real part of the elastic scattering amplitude at the S anti-p p S

The UA4/2 collaboration Augier, C. ; Bernard, Denis ; Bourotte, J. ; et al.
Phys.Lett. B316 (1993) 448-454, 1993.
Inspire Record 358433 DOI 10.17182/hepdata.28818
2 data tables

No description provided.

Real part of amplitude extracted using a more precise UA4 measurement. (1 +RE(AMP)/IM(AMP)**2)SIG(TOT) = 63.5 +- 1.5 MB (Bozzo et al. PL 147B(1984)392).


Study of the reaction pi- p ---> eta-prime eta-prime n

Berdnikov, E.B. ; Bityukov, S.I. ; Borisov, G.V. ; et al.
Z.Phys. C57 (1993) 13-16, 1993.
Inspire Record 340793 DOI 10.17182/hepdata.14498
2 data tables

No description provided.

No description provided.


DIFFRACTIVE PRODUCTION OF pi- pi- pi+ IN 200-GeV/c pi- N INTERACTIONS

Joyner, R.W. ; Chang, C.C. ; Davis, T.C. ; et al.
Phys.Rev. D39 (1989) 1865, 1989.
Inspire Record 22768 DOI 10.17182/hepdata.23242
8 data tables

No description provided.

No description provided.

Diffraction from coherent carbon nucleus.

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OBSERVATION OF AN EXOTIC MESON OF 1.9-GeV MASS DECAYING INTO eta-prime eta

The IFVE-Brussels-Annecy-Los-Alamos collaboration Alde, D. ; Binon, F.G. ; Bricman, C. ; et al.
Sov.J.Nucl.Phys. 48 (1988) 1035, 1988.
Inspire Record 264474 DOI 10.17182/hepdata.40730
2 data tables

No description provided.

No description provided.


TOTAL DISINTEGRATION OF HELIUM NUCLEI IN He-3 p INTERACTIONS AT 13.5-GeV/c

The Dubna-Warsaw-Kosice-Moscow-Strasbourg-Tbilisi collaboration Glagolev, V.V. ; Lebedev, R.M. ; Pestova, G.D. ; et al.
No Journal Information, 1988.
Inspire Record 267741 DOI 10.17182/hepdata.38788
4 data tables

No description provided.

No description provided.

'CHARGED EXCHANGED REACTION', MOMENTUM OF N IS GREATER THAN MOMENTUM OF EACH PROTON.

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Measurement of $b$, the Nuclear Slope Parameter of the $p\bar{p}$ Elastic Scattering Distribution at $\sqrt{s}$ = 1800-GeV

The E710 collaboration Amos, Norman A. ; Baker, W.F. ; Bertani, M. ; et al.
Phys.Rev.Lett. 61 (1988) 525, 1988.
Inspire Record 261411 DOI 10.17182/hepdata.20066
2 data tables

No description provided.

Error contains estimate of systematic effects.


Exclusive $\rho^0$ and $\phi$ Production in Deep Inelastic Muon Scattering

The European Muon collaboration Ashman, J. ; Badelek, B. ; Baum, Guenter ; et al.
Z.Phys. C39 (1988) 169, 1988.
Inspire Record 252743 DOI 10.17182/hepdata.15619
6 data tables

No description provided.

No description provided.

No description provided.

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INVESTIGATION OF COMPTON EFFECT ON pi MESON AND CHARGED PION POLARIZABILITY

The SIGMA-AYaKS Dubna-Serpukhov-Tbilisi collaborations Antipov, Yu.M. ; Batarin, V.A. ; Bezzubov, V.A. ; et al.
No Journal Information, 1986.
Inspire Record 239905 DOI 10.17182/hepdata.9549
4 data tables

No description provided.

No description provided.

No description provided.

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A STUDY OF INELASTIC DIFFRACTION OF pi- MESON IN pi+ pi- pi- SYSTEM USING A 'LIVE' TARGET OF SILICON

Vegni, G. ; Vishnyakov, V.V. ; Zaimidoroga, O.A. ; et al.
Yad.Fiz. 43 (1986) 1480-1486, 1986.
Inspire Record 218427 DOI 10.17182/hepdata.39505
1 data table

No description provided.


QUASIELASTIC PRODUCTION OF LAMBDA HYPERON IN ANTI-NEUTRINO INTERACTIONS AT HIGH-ENERGIES

Ammosov, V.V. ; Asratian, A.E. ; Gapienko, V.A. ; et al.
JETP Lett. 43 (1986) 716-719, 1986.
Inspire Record 240170 DOI 10.17182/hepdata.2210
2 data tables

No description provided.

No description provided.


Study of a Possible Exotic $\phi \pi^0$ State With a Mass of About 1.5-{GeV}/$c^2$

Bityukov, S.I. ; Dzhelyadin, R.I. ; Dorofeev, V.A. ; et al.
Phys.Lett. B188 (1987) 383, 1987.
Inspire Record 233160 DOI 10.17182/hepdata.10556
3 data tables

No description provided.

No description provided.

THE ACCEPTANCE CORRECTED DISTRIBUTION.


Production of $G(1590)$ and Other Mesons Decaying Into $\eta$ Pairs by 100-{GeV}/$c \pi^-$ on Protons

Alde, D. ; Binon, F.G. ; Bricman, C. ; et al.
Yad.Fiz. 44 (1986) 120-136, 1986.
Inspire Record 222928 DOI 10.17182/hepdata.10313
3 data tables

No description provided.

No description provided.

No description provided.


Observation of Longitudinal Event Structure in Proton Diffractive Dissociation at the {ISR}

The R608 collaboration Smith, A.M. ; Meritet, L. ; Reyrolle, M. ; et al.
Phys.Lett. B167 (1986) 248-254, 1986.
Inspire Record 219984 DOI 10.17182/hepdata.30272
2 data tables

Acceptance corrected distribution of momentum transfer to the diffractive (p-4pi) system. Data requested from authors.

No description provided.


MEASUREMENT OF COUPLING CONSTANT GAMMA ---> 3 PI IN THE PROCESS OF PION PAIR PRODUCTION BY PIONS IN NUCLEAR COULOMB FIELD. (IN RUSSIAN)

Antipov, Yu.M. ; Batarin, V.A. ; Bessubov, V.A. ; et al.
No Journal Information, 1985.
Inspire Record 221558 DOI 10.17182/hepdata.38294
4 data tables

No description provided.

No description provided.

No description provided.

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ANALYSIS OF THE REACTION PI- P ---> PI0 ETA N AT 40-GEV/C BEAM MOMENTUM.

The SERPUKHOV-CERN collaboration Apel, W.D. ; Augenstein, K.H. ; Bertolucci, E. ; et al.
Yad.Fiz. 41 (1985) 126-136, 1985.
Inspire Record 218766 DOI 10.17182/hepdata.2594
6 data tables

No description provided.

No description provided.

No description provided.

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EVIDENCE FOR RESONANT STRUCTURES IN THE LAMBDA anti-p SYSTEM

The Bari-Birmingham-CERN-Milan-Paris-Pavia collaboration Armstrong, T. ; Baubillier, M. ; Bloodworth, I.J. ; et al.
Nucl.Phys. B227 (1983) 365-386, 1983.
Inspire Record 191867 DOI 10.17182/hepdata.33928
3 data tables

UNCORRECTED DISTRIBUTION.

FULLY CORRECTED CROSS SECTION.

CROSS SECTIONS FOR RESONANCES. BREIT WIGNER FITTED WITH NO ADDITIONAL BACKGROUND.


Diffractive Production of K0(s) K0(s) pi+ pi- pi- in pi- n Interactions at 200-GeV/c

Chang, C.C. ; Davis, T.C. ; Diamond, R.N. ; et al.
Phys.Rev. D29 (1984) 1888-1894, 1984.
Inspire Record 194648 DOI 10.17182/hepdata.23730
3 data tables

No description provided.

No description provided.

No description provided.


COMPTON EFFECT ON pi- MESON

Antipov, Yu.M. ; Batarin, V.A. ; Bessubov, V.A. ; et al.
Z.Phys. C24 (1984) 39, 1984.
Inspire Record 193860 DOI 10.17182/hepdata.41183
6 data tables

No description provided.

No description provided.

No description provided.

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First Results on Low Momentum Transfer Elastic Scattering at the {CERN} Proton - Anti-proton Collider

The UA4 collaboration Battiston, R. ; Bozzo, M. ; Braccini, P.L. ; et al.
Phys.Lett. B115 (1982) 333-337, 1982.
Inspire Record 178576 DOI 10.17182/hepdata.30890
2 data tables

No description provided.

EXPONENTIAL SLOPE OF FIT TO DN/DT IN REGION 0.05 <-T <0.19 GEV**-2.