Abaev, V.V.
DSIG/DOMEGA
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Cross Section for $\gamma n \to \pi^0 n$ measured at Mainz/A2

The A2 collaboration Briscoe, W.J. ; Hadžimehmedović, M. ; Kudryavtsev, A.E. ; et al.
Phys.Rev.C 100 (2019) 065205, 2019.
Inspire Record 1748263 DOI 10.17182/hepdata.116236

The $\gamma n \to \pi^0 n$ differential cross section evaluated for 27 energy bins span the photon-energy range 290-813 MeV (W = 1.195-1.553 GeV) and the pion c.m. polar production angles, ranging from 18 deg to 162 deg, making use of model-dependent nuclear corrections to extract pi0 production data on the neutron from measurements on the deuteron target. Additionally, the total photoabsorption cross section was measured. The tagged photon beam produced by the 883-MeV electron beam of the Mainz Microtron MAMI was used for the 0-meson production. Our accumulation of 3.6 x 10^6 $\gamma n \to \pi^0 n$ events allowed a detailed study of the reaction dynamics. Our data are in reasonable agreement with previous A2 measurements and extend them to lower energies. The data are compared to predictions of previous SAID, MAID, and BnGa partial-wave analyses and to the latest SAID fit MA19 that included our data. Selected photon decay amplitudes $N^* \to \gamma n$ at the resonance poles are determined for the first time.

21 data tables
Table 1

Excitation function at pion c.m. angle THETA=18 deg as function of incident photon energy E. The uncertainties are statistical and systematic, combined in quadrature.

Table 2

Excitation function at pion c.m. angle THETA=32 deg as function of incident photon energy E. The uncertainties are statistical and systematic, combined in quadrature.

Table 3

Excitation function at pion c.m. angle THETA=41 deg as function of incident photon energy E. The uncertainties are statistical and systematic, combined in quadrature.

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Elastic Scattering of 300-MeV Negative Pions by Hydrogen

Vasilevskii, I.M. ; Vishnyakov, V.V. ;
Sov.Phys.JETP 11 (1960) 323-326, 1960.
Inspire Record 1407579 DOI 10.17182/hepdata.70213

The elastic scattering of 300-Mev negative pions from hydrogen was studied with the aid of a hodoscopic system with pulse-fed counters. Equation (1) gives the angular distribution for the elastic scattering under the hypothesis that the fundamental contribution to the scattering comes from the S and P waves.

1 data table
Table 1

No description provided.


The investigation of charge-exchange of $\pi^- + p \rightarrow n + \pi^0$ and $\pi^- + p \rightarrow n + \eta (\eta \rightarrow 2\gamma)$ reaction in the momentum interval 1.25-4.5 BeV/c

Barmin, V.V. ; Dolgolenko, A.G. ; Krestnikov, Yu.S. ; et al.
213-218, 1963.
Inspire Record 1407770 DOI 10.17182/hepdata.70346

None

4 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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An Investigation of the $\pi + p \longrightarrow n + {\pi}^0$ Charge Exchange Scattering and the ${\pi}^{-} + p \longrightarrow n + {\eta}({\eta} {\longrightarrow} 2\gamma)$ Reaction in the 1.55-4.5 BeV/c Region

Barmin, V.V. ; Dolgolenko, A.G. ; Krestnikov, Yu.S. ; et al.
Sov.Phys.JETP 19 (1964) 102-106, 1964.
Inspire Record 1407540 DOI 10.17182/hepdata.70207

The rr- + p- n + rr0 charge-exchange scattering and the rr- + p- n + 1J ( 1J- 2y) reaction were investigated in 1.55-4.5 BeVIc region in a 17-liter propane-xenon bubble chamber. The total cross sections of both reactions were measured in this region. The angular distributions of the rr0 mesons in the charge-exchange reaction were obtained. The backward exchange-scattering cross sections du( rr- + p- n + rr 0 )ldQ were estimated.

3 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.


Investigation of $\pi^- + p \rightarrow \pi^0 + n$ exchange scattering at 2.8. BeV/c

Barmin, V.V. ; Dolgolenko, A.G. ; Meshkovskii, A.G. ; et al.
Sov.J.Nucl.Phys. 4 (1967) 592-595, 1967.
Inspire Record 1407282 DOI 10.17182/hepdata.69980

None

3 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.


High-precision Measurements of piP Elastic Differential Cross Sections in the Second Resonance Region

The EPECUR collaboration Alekseev, I.G. ; Andreev, V.A. ; Bordyuzhin, I.G. ; et al.
Phys.Rev.C 91 (2015) 025205, 2015.
Inspire Record 1323450 DOI 10.17182/hepdata.67659

Cross sections for pi+-p elastic scattering have been measured to high precision, for beam momenta between 800 and 1240 MeV/c, by the EPECUR Collaboration, using the ITEP proton synchrotron. The data precision allows comparisons of the existing partial-wave analyses (PWA) on a level not possible previously. These comparisons imply that updated PWA are required.

249 data tables
Table 1

Differential cross section of elastic $\pi^+$p-scattering at P= 800.25 MeV/c. Errors shown are statistical only.

Table 2

Differential cross section of elastic $\pi^+$p-scattering at P= 803.75 MeV/c. Errors shown are statistical only.

Table 3

Differential cross section of elastic $\pi^+$p-scattering at P= 807.25 MeV/c. Errors shown are statistical only.

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Photoproduction of Neutral Pions off Protons

The CBELSA/TAPS collaboration Crede, V. ; Sparks, N. ; Wilson, A. ; et al.
Phys.Rev.C 84 (2011) 055203, 2011.
Inspire Record 917921 DOI 10.17182/hepdata.61486

Photoproduction of neutral pions has been studied with the CBELSA/TAPS detector in the reaction $\gamma p\to p\pi^0$ for photon energies between 0.85 and 2.50 GeV. The $\pi^0$ mesons are observed in their dominant neutral decay mode: $\pi^0\to\gamma\gamma$. For the first time, the differential cross sections cover the very forward region, $\theta_{\rm c.m.}<60^\circ$. A partial-wave analysis of these data within the Bonn-Gatchina framework observes the high-mass resonances $G_{17}$(2190), $D_{13}$(2080), and $D_{15}$(2070).

82 data tables
Table 1

Differential cross section for the process GAMMA P --> PI0 P as a function of the cosine of the centre-of-mass scattering angle of the PI0 for photon energies from 0.850 to 0.875 GeV.

Table 2

Differential cross section for the process GAMMA P --> PI0 P as a function of the cosine of the centre-of-mass scattering angle of the PI0 for photon energies from 0.875 to 0.900 GeV.

Table 3

Differential cross section for the process GAMMA P --> PI0 P as a function of the cosine of the centre-of-mass scattering angle of the PI0 for photon energies from 0.900 to 0.925 GeV.

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Photoproduction of $\eta$ and $\eta\prime$ Mesons off Protons

The CBELSA/TAPS collaboration Crede, V. ; McVeigh, A. ; Anisovich, A.V. ; et al.
Phys.Rev.C 80 (2009) 055202, 2009.
Inspire Record 836340 DOI 10.17182/hepdata.53229

Total and differential cross sections for $\eta$ and $\eta ^\prime$ photoproduction off the proton have been determined with the CBELSA/TAPS detector for photon energies between 0.85 and 2.55 GeV. The $\eta$ mesons are detected in their two neutral decay modes, $\eta\to\gamma\gamma$ and $\eta\to 3\pi^0\to 6\gamma$, and for the first time, cover the full angular range in $\rm cos \theta_{cm}$ of the $\eta$ meson. These new $\eta$ photoproduction data are consistent with the earlier CB-ELSA results. The $\eta ^\prime$ mesons are observed in their neutral decay to $\pi^0\pi^0\eta\to 6\gamma$ and also extend the coverage in angular range.

56 data tables
Table 1

Differential cross section for ETA production at incident photon energy 0.850 to 0.900 GeV.

Table 2

Differential cross section for ETA production at incident photon energy 0.900 to 0.950 GeV.

Table 3

Differential cross section for ETA production at incident photon energy 0.950 to 1.000 GeV.

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Neutral Pion Electroproduction in the Resonance Region at High $Q^2$

Villano, A.N. ; Stoler, P. ; Bosted, P.E. ; et al.
Phys.Rev.C 80 (2009) 035203, 2009.
Inspire Record 823260 DOI 10.17182/hepdata.54189

The process $ep \to e^{\prime}p^{\prime}\pi^0$ has been measured at $Q^2$ = 6.4 and 7.7 \ufourmomts in Jefferson Lab's Hall C. Unpolarized differential cross sections are reported in the virtual photon-proton center of mass frame considering the process $\gamma^{\ast}p \to p^{\prime}\pi^0$. Various details relating to the background subtractions, radiative corrections and systematic errors are discussed. The usefulness of the data with regard to the measurement of the electromagnetic properties of the well known $\Delta(1232)$ resonance is covered in detail. Specifically considered are the electromagnetic and scalar-magnetic ratios $R_{EM}$ and $R_{SM}$ along with the magnetic transition form factor $G_M^{\ast}$. It is found that the rapid fall off of the $\Delta(1232)$ contribution continues into this region of momentum transfer and that other resonances

125 data tables
Table 1

Differential cross sections at Q**2=6.564 GeV**2, EPSILON=0.4523, W=1.112 GeV and COS(THETA(*))=-0.9 for the small SOS spectrometer.

Table 2

Differential cross sections at Q**2=6.564 GeV**2, EPSILON=0.4523, W=1.112 GeV and COS(THETA(*))=-0.7 for the small SOS spectrometer.

Table 3

Differential cross sections at Q**2=6.564 GeV**2, EPSILON=0.4523, W=1.112 GeV and COS(THETA(*))=-0.5 for the small SOS spectrometer.

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Quasi-free photoproduction of eta-mesons of the neutron

The CBELSA & TAPS collaborations Jaegle, I. ; Mertens, T. ; Anisovich, A.V. ; et al.
Phys.Rev.Lett. 100 (2008) 252002, 2008.
Inspire Record 784698 DOI 10.17182/hepdata.50884

Quasi-free photoproduction of eta-mesons off nucleons bound in the deuteron has been measured with the CBELSA/TAPS detector for incident photon energies up to 2.5 GeV at the Bonn ELSA accelerator. The eta-mesons have been detected in coincidence with recoil protons and recoil neutrons, which allows a detailed comparison of the quasi-free n(gamma,eta)n and p(gamma,eta)p reactions. The excitation function for eta-production off the neutron shows a pronounced bump-like structure at W=1.68 GeV (E_g ~ 1 GeV), which is absent for the proton.

22 data tables
Table 1

Measured value of the quasi-free eta cross section off protons and neutrons as a function of incident photon energy.

Table 2

Ratio of the measured quasi-free neutron to proton cross sections as a function of incident photon energy.

Table 3

Measured angular distribution for an incident photon energy of 0.700 GeV.

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Electroproduction of Eta Mesons in the S11(1535) Resonance Region at High Momentum Transfer

Dalton, M.M. ; Adams, G.S. ; Ahmidouch, A. ; et al.
Phys.Rev.C 80 (2009) 015205, 2009.
Inspire Record 783943 DOI 10.17182/hepdata.50548

The differential cross-section for the process p(e,e'p)eta has been measured at Q2 ~ 5.7 and 7.0 (GeV/c)2 for centre-of-mass energies from threshold to 1.8 GeV, encompassing the S11(1535) resonance, which dominates the channel. This is the highest momentum transfer measurement of this exclusive process to date. The helicity-conserving transition amplitude A_1/2, for the production of the S11(1535) resonance, is extracted from the data. This quantity appears to begin scaling as 1/Q3, a predicted signal of the dominance of perturbative QCD, at Q2 ~ 5 (GeV/c)2.

39 data tables
Table 1

Total cross section for the lower Q**2 data as a function of W. The errors are statistics and systematic added in quadrature.

Table 2

Total cross section for the higher Q**2 data as a function of W. The errors are statistics and systematic added in quadrature.

Table 3

Lower Q**2 extracted differential cross section at W = 1.500 GeV and cos(theta(eta) = -0.917, -0.750 and -0.583.

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Measurement of pi- p ---> pi0 n in the vicinity of the eta threshold

Starostin, A. ; Prakhov, S. ; Nefkens, B.M.K. ; et al.
Phys.Rev.C 72 (2005) 015205, 2005.
Inspire Record 688197 DOI 10.17182/hepdata.25171

We report a new measurement of the differential cross section for π−p→π0n from pπ=649 to 752 MeV/c, which is around the opening of the η channel (685 MeV/c). Our data support the main features of the π−p charge-exchange differential cross sections generated by the SAID πN partial-wave analysis. The opening of the η channel has a clear effect on the shape of the excitation function for dσ(π−p→π0n), which is most noticeable in the backward direction.

9 data tables
Table 1

Differential cross section for incident pion momentum 649, 654 and 657 MeV.

Table 2

Differential cross section for incident pion momentum 661, 666 and 669 MeV.

Table 3

Differential cross section for incident pion momentum 673, 678 and 681 MeV.

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Differential cross section of the pion nucleon charge-exchange reaction pi- p --> pi0 n in the momentum range from 148-MeV/c to 323-MeV/c.

The Crystal Ball collaboration Sadler, M.E. ; Kulbardis, A. ; Abaev, V. ; et al.
Phys.Rev.C 69 (2004) 055206, 2004.
Inspire Record 646714 DOI 10.17182/hepdata.31725

Measured values of the differential cross section for pion-nucleon charge exchange are presented at momenta 148, 174, 188, 212, 238, 271, 298, and 323 MeV/c, a region dominated by the Delta resonance. Complete angular distributions were obtained using the Crystal Ball detector at the Alternating Gradient Synchrotron (AGS) at Brookhaven National Laboratory (BNL). Statistical uncertainties of the differential cross sections are typically 2-6%, exceptions being the results at the lowest momentum and at the most forward measurements of the five lowest momenta. We estimate the systematic uncertainties to be 3-6%.

3 data tables
Table 1

The errors shown are statistical only.

Table 2

The errors shown are statistical only.

Table 3

The total charge-exchange reaction cross section as a function of pion momentum obtained by integrating the differential cross sections. The errors shown are the total and statistical errors.


Phi and omega meson production in p p reactions at p(lab) = 3.67-GeV/c.

The DISTO collaboration Balestra, F. ; Bedfer, Y. ; Bertini, R. ; et al.
Phys.Rev.C 63 (2001) 024004, 2001.
Inspire Record 537109 DOI 10.17182/hepdata.25485

The exclusive production cross sections for $\omega$ and $\phi$ mesons have been measured in proton-proton reactions at $p_{lab}=3.67$ GeV/c. The observed $\phi/\omega$ cross section ratio is $(3.8\pm0.2^{+1.2}_{-0.9})\times 10^{-3}$. After phase space corrections, this ratio is enhanced by about an order of magnitude relative to naive predictions based upon the Okubo-Zweig-Iizuka (OZI) rule, in comparison to an enhancement by a factor $\sim 3$ previously observed at higher beam momenta. The modest increase of this enhancement near the production threshold is compared to the much larger increase of the $\phi/\omega$ ratio observed in specific channels of $\bar pp$ annihilation experiments. Furthermore, differential cross section results are also presented which indicate that although the $\phi$ meson is predominantly produced from a $^3P_1$ proton-proton entrance channel, other partial waves contribute significantly to the production mechanism at this beam momentum.

8 data tables
Table 1

No description provided.

Table 2

Differential cross section of OMEGA production.

Table 3

Differential cross section of PHI production.

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Production of eta' mesons in the p p --> p p eta' reaction at 3.67-GeV/c.

The DISTO collaboration Balestra, F. ; Bedfer, Y. ; Bertini, R. ; et al.
Phys.Lett.B 491 (2000) 29-35, 2000.
Inspire Record 532685 DOI 10.17182/hepdata.31445

The ratio of the total exclusive production cross sections for $\eta\prime$ and $\eta$ mesons has been measured in the $pp$ reaction at $p_{beam}=3.67$ GeV/c. The observed $\eta\prime/\eta$ ratio is $(0.83\pm{0.11}^{+0.23}_{-0.18})\times 10^{-2}$ from which the exclusive $\eta\prime$ meson production cross section is determined to be $(1.12\pm{0.15}^{+0.42}_{-0.31})\mu b$. Differential cross section distributions have been measured. Their shape is consistent with isotropic $\eta\prime$ meson production.

5 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

Only statistial errors.

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Large-angle elastic pion proton scattering at momenta 0.9-GeV/c to 2.0-GeV/c.

Abramov, B.M. ; Bulychjov, Sergey A. ; Dukhovskoi, I.A. ; et al.
Sov.J.Nucl.Phys. 54 (1991) 332-337, 1991.
Inspire Record 318074 DOI 10.17182/hepdata.39980

None

11 data tables
Table 1

THE MOMENTUM OF EACH INCIDENT PION WAS DETERMINED WITH AN ACCURACY 0.2 PCT.

Table 2

THE MOMENTUM OF EACH INCIDENT PION WAS DETERMINED WITH AN ACCURACY 0.2 PCT.

Table 3

THE MOMENTUM OF EACH INCIDENT PION WAS DETERMINED WITH AN ACCURACY 0.2 PCT.

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Pion - deuteron elastic scattering at large angles from 0.90-GeV/c to 2.025-GeV/c

Abramov, B.M. ; Bulychjov, Sergey A. ; Druzhinin, B.L. ; et al.
Nucl.Phys.A 542 (1992) 579-586, 1992.
Inspire Record 294362 DOI 10.17182/hepdata.36686

The differential cross section for the backward (120° ⩽ θ c.m.s. ⩽ 180°) pion-deuteron elastic scattering was measured at eight incident pion momenta from 0.90 to 2.025 GeV/ c . A distinctive change in the shape of the angular distribution is observed. At 0.9 GeV/ c the differential cross section decreases smoothly to 180° in accordance with predictions of multiple-scattering theory. At 1.31 GeV/ c , i.e. in the region of the hypothetical 1 I 6 dibaryon with a mass of 2.9 GeV, the differential cross section is practically independent of angle. At higher energies a sharp backward peak is clearly seen. Connections of our results with dibaryons and Regge asymptotic behaviour are discussed.

8 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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NEW RESULTS ON BACKWARD PION - DEUTERON SCATTERING FROM 0.83-GeV/c TO 1.16-GeV/c

Abramov, B.M. ; Bulychjov, Sergey A. ; Dukhovskoi, I.A. ; et al.
Sov.J.Nucl.Phys. 50 (1989) 650-651, 1989.
Inspire Record 281458 DOI 10.17182/hepdata.17312

None

1 data table
Table 1

No description provided.


The reaction H-3 p --> p n d at a H-3 nucleus momentum 5-GeV/c.

Abdullin, S.K. ; Blinov, A.V. ; Vanyushin, I.A. ; et al.
Sov.J.Nucl.Phys. 50 (1989) 250-254, 1989.
Inspire Record 281654 DOI 10.17182/hepdata.40028

None

1 data table
Table 1

No description provided.


The relative differential cross-section data in elastic scattering of negative pions on protons between 1.43-GeV/c and 2.07-GeV/c

Alekseev, I.G. ; Budkovsky, P.E. ; Kanavets, V.P. ; et al.
136-141, 1989.
Inspire Record 292460 DOI 10.17182/hepdata.40058

None

1 data table
Table 1

NAME=THEORY DENOTES THE MONTE-CARLO GENERATED CROSS SECTIONS.


Measurements of cross-sections for inclusive reactions pi+ pi- N ---> proton X at 1.84-GeV/c, 2.22-GeV/c, and 2.63-GeV/c and test of the model of inelastic intermediate states for pion - deuteron backward scattering

Abramov, B.M. ; Bulychjov, S.A. ; Dukhovskoi, I.A. ; et al.
Sov.J.Nucl.Phys. 48 (1988) 96-100, 1988.
Inspire Record 260552 DOI 10.17182/hepdata.2435

None

2 data tables
Table 1

No description provided.

Table 2

No description provided.


FORMATION OF 5 - 12 CHARGE FRAGMENTS IN THE p Au REACTION AT 2.6-GeV - 7.5-GeV PROTON ENERGY

Avdeichikov, V.V. ; Bogdanov, A.I. ; Budilov, V.A. ; et al.
JINR-P1-87-509, 1987.
Inspire Record 251579 DOI 10.17182/hepdata.9481

None

3 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.


OBSERVATION OF INVERSE ELECTROPRODUCTION OF PIONS ON C-12 NUCLEUS AT 164-MeV PION ENERGY AND DETERMINATION OF F1(v) NUCLEON FORM-FACTOR

Alekseev, G.D. ; Blokhintseva, T.D. ; Karpukhin, V.V. ; et al.
Sov.J.Nucl.Phys. 46 (1987) 801, 1987.
Inspire Record 247868 DOI 10.17182/hepdata.38865

None

3 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.


REACTION OF QUASIELASTIC CHARGE EXCHANGE P HE-3 ---> N(F) P P P AT MEDIUM-ENERGIES. (IN RUSSIAN)

Blinov, A.V. ; Vanyushin, I.A. ; Grechko, V.E. ; et al.
Sov.J.Nucl.Phys. 47 (1988) 594, 1988.
Inspire Record 253277 DOI 10.17182/hepdata.9993

None

8 data tables
Table 1

N IS FAST IN LABORATORY SYSTEM. CUT FOR 'FAST' SELECTION WAS:. PLAB(P=3) > PMIN(P=3), WHERE PMIN IS DETERMINED FROM ALL EVENTS.

Table 2

N IS FAST IN LABORATORY SYSTEM. CUT FOR 'FAST' SELECTION WAS:. PLAB(P=3) > PMIN(P=4,5,6), WHERE PMIN IS DETERMINED FROM ALL EVENTS.

Table 3

No description provided.

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BACKWARD PION - DEUTERON ELASTIC SCATTERING FROM 1.75-GeV/c TO 3.1-GeV/c

Abramov, B.M. ; Ayrapetov, E.A. ; Bagdasaryan, L.S. ; et al.
Phys.Lett.B 189 (1987) 295-298, 1987.
Inspire Record 219757 DOI 10.17182/hepdata.40130

Measurements of the differential cross section for π − d elastic scattering in the backward angular region (−1 ⩽ cos θ cms ⩽ −0.98) are presented. These measurements were made at nine incident pion momenta P π ranging from 1.75 to 3.09 GeV/ c and at the largest values of q 2 [up to 7 (GeV/ c ) 2 ] ever reached experimentally; here q 2 is the momentum transfer squared. The differential cross section was found to decrease rapidly with increasing momentum d σ d Ω cms (180°) ∼ P −15.7 π , d σ d t ∼ (q 2 ) −12.8 . The data are compared with predictions of Regge and quark bag models.

1 data table
Table 1

Statistical errors only.