ND experiment

Template:Short description Neutral Detector (ND) is a detector for particle physics experiments created by the team of physicists in the Budker Institute of Nuclear Physics, Novosibirsk, Russia. Experiments with the ND were conducted from 1982 to 1987 at the e⁺e⁻ storage ring VEPP-2M in the energy range 2E=0.5-1.4 GeV.

Physics

At the beginning of 80s the leading cross sections of the electron-positron annihilation in the final states with charged particles were measured in the energy range 2E=0.5-1.4 GeV. Processes with the neutral particles in the final state were less studied. To investigate the radiative decays of the $ρ^{0}$ , $ω$ , and $ϕ$ mesons and other processes involving photons, $π^{0}$ , and $η$ mesons the ND ^[1] was constructed. Its distinguishing features are defined by the specially designed electromagnetic calorimeter based on NaI(Tl) scintillation counters.

List of published analyses ^[2]

Radiative decays

e^{+} e^{-} \to ρ, ω, ϕ \to π^{0} γ, η γ

^[3]^[4]

ϕ \to η^{'} γ

^[5]

Rare decays of the $ρ^{0}$ , $ω$ , and $ϕ$ mesons

ω, ϕ \to π^{0} e^{+} e^{-}

^[6]

ϕ \to π^{+} π^{-}

^[7]

Search for rare decays

ρ \to π^{+} π^{-} π^{0}

^[8]

ω, ϕ \to π^{0} π^{0} γ

^[3]^[5]

ϕ \to π^{0} η γ

^[9]

light scalars

a_{0} (980)

and

f_{0} (975)

in

ϕ

-meson radiative decays ^[5]

Non-resonant electron-positron annihilation into hadrons

e^{+} e^{-} \to ω π^{0}

^[10]

e^{+} e^{-} \to π^{+} π^{-} π^{0}, π^{+} π^{-} η

^[11]^[12]

e^{+} e^{-} \to π^{+} π^{-} π^{+} π^{-}, π^{+} π^{-} π^{0} π^{0}

^[13]

Test of QED processes ^[14]^[15]

e^{+} e^{-} \to γ γ γ γ

e^{+} e^{-} \to e^{+} e^{-} γ γ

e^{+} e^{-} \to e^{+} e^{-} e^{+} e^{-}

e^{+} e^{-} \to e^{+} e^{-} γ

(virtual Compton scattering) ^[16]

Analyses of other processes
- Measurement of the ω-meson parameters ^[17]
- Upper limits on electron width of scalar and tensor mesons $f_{0} (975)$ , $f_{2} (1270)$ , $f_{0} (1300)$ , $a_{0} (980)$ , and $a_{2} (1320)$ ^[18]
- $ϕ \to π^{+} π^{-} π^{0}, K_{S}^{0} K_{L}^{0}$ ^[19]
- Search for
  - $e^{+} e^{-} \to π^{0} π^{0} γ$ ^[20]
  - $K_{S}^{0} \to γ γ$ ^[21]
  - $e^{+} e^{-} \to C (1480) \to ϕ π^{0}$ ^[22]

Detector

Based on goals of the physics program the ND consist of

Electromagnetic calorimeter

168 rectangular NaI(Tl) scintillation counters
total mass of NaI(Tl) is 2.6 t
solid angle coverage is 65% of 4π sr
minimum thickness is 32 cm or 12 radiation length
energy resolution for photons is σ/E = 4% / Template:Radic

Charged particle coordinate system

3 layers of coaxial cylindrical 2-d wire proportional chambers in the center of the detector
solid angle coverage is 80% of 4π sr
angular resolution is 0.5° in the azimuthal and 1.5° in the polar direction
surrounded by the 5-mm thick plastic scintillation counter for trigger

Flat (shower) coordinate 2-d wire proportional chambers

2 layers of flat 2-d wire proportional chambers.
angular resolution is 2° in the azimuthal and 3.5° in the polar direction for 0.5 GeV photons

Iron absorber & anti-coincidence counters

The electromagnetic calorimeter is covered by the 10-cm thick iron absorber and plastic scintillation anti-coincidence counters.

Results

Data collected with the ND experiment corresponds to the integrated luminosity 19 pb⁻¹. Results of the experiments with ND are presented in Ref.,^[2] and are included in the PDG Review. ^[23]

References

Template:Reflist

External links

Budker Institute of Nuclear Physics (BINP)
VEPP-2M
NOVOSIBIRSK-ND experiment record on INSPIRE-HEP

↑ Template:Cite journal
↑ ^2.0 ^2.1 Template:Cite journal
↑ ^3.0 ^3.1 Template:Cite journal
↑ Template:Cite journal
↑ ^5.0 ^5.1 ^5.2 Template:Cite journal
↑ S.I. Dolinsky et al., Sov. J. Nucl. Phys. 48 (1988) 277.
↑ V. B. Golubev et al., Sov. J. Nucl. Phys. 44 (1986) 409.
↑ V. B. Vasserman et al., Sov. J. Mod. Phys. 48 (1988) 480.
↑ V. M. Aulchcnko et al., Preprini INP 87-90 (Novosibirsk, 1987).
↑ Template:Cite journal
↑ A. D. Bukin et al., Sov. J. Nucl. Phys. 50 (1989) 621.
↑ Template:Cite journal
↑ V. M. Aulchenko et al., Preprint INP 86-106 (Novosibirsk, 1987).
↑ V. P. Druzhinin et al., Preprint INP 85-98 (Novosibirsk, 1985).
↑ V. M. Aulchcnko et al., Preprint INP 86-173 (Novosibirsk, 1986).
↑ V. B. Golubev et al., Sov. J. Nucl. Phys. 41(1985) 752.
↑ Template:Cite journal
↑ P. V. Vorobyov et al., Sov. J. Nucl. Phys. 48 (1988) 436.
↑ V. P. Druzhinin et al., Preprint INP 85-97 (Novosibirsk, 1985).
↑ V. B. Golubev et al., Sov. J. Nucl. Phys. 45 (1987) 622.
↑ I. B. Vasserman et al., JETP Lett. 43(1986) 588.
↑ V. M. Aulchenkoet al., JETP Lett. 45 (1987) 145.
↑ The Review of Particle Physics, K. Nakamura et al. (Particle Data Group), J. Phys. G 37, 075021 (2010)

[ND-1] Template:Cite journal

[Summary-2] 2.0 ^2.1 Template:Cite journal

[rad-dec-rho-omega-3] 3.0 ^3.1 Template:Cite journal

[rad-dec-phi-4] Template:Cite journal

[search-rare-rad-dec-phi-5] 5.0 ^5.1 ^5.2 Template:Cite journal

[6] S.I. Dolinsky et al., Sov. J. Nucl. Phys. 48 (1988) 277.

[7] V. B. Golubev et al., Sov. J. Nucl. Phys. 44 (1986) 409.

[8] V. B. Vasserman et al., Sov. J. Mod. Phys. 48 (1988) 480.

[9] V. M. Aulchcnko et al., Preprini INP 87-90 (Novosibirsk, 1987).

[omega-pi0-10] Template:Cite journal

[11] A. D. Bukin et al., Sov. J. Nucl. Phys. 50 (1989) 621.

[etapipi-12] Template:Cite journal

[13] V. M. Aulchenko et al., Preprint INP 86-106 (Novosibirsk, 1987).

[14] V. P. Druzhinin et al., Preprint INP 85-98 (Novosibirsk, 1985).

[15] V. M. Aulchcnko et al., Preprint INP 86-173 (Novosibirsk, 1986).

[16] V. B. Golubev et al., Sov. J. Nucl. Phys. 41(1985) 752.

[omega-pars-17] Template:Cite journal

[18] P. V. Vorobyov et al., Sov. J. Nucl. Phys. 48 (1988) 436.

[19] V. P. Druzhinin et al., Preprint INP 85-97 (Novosibirsk, 1985).

[20] V. B. Golubev et al., Sov. J. Nucl. Phys. 45 (1987) 622.

[21] I. B. Vasserman et al., JETP Lett. 43(1986) 588.

[22] V. M. Aulchenkoet al., JETP Lett. 45 (1987) 145.

[23] The Review of Particle Physics, K. Nakamura et al. (Particle Data Group), J. Phys. G 37, 075021 (2010)

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ND experiment

Contents

Physics

Detector

Results

See also

References

External links

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ND experiment

Physics

Detector

Results

See also

References

External links

Navigation menu

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