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1.
Production and decay of $\eta^\prime$(958) and $\eta$(1440) in $\bar{p} p$ annihilation at rest / Amsler, Claude (U. Zurich (main)) ; Anisovich, A V (U. Bonn (main)) ; Baker, C A (Rutherford) ; Barnett, B M (U. Bonn (main)) ; Batty, C J (Rutherford) ; Blum, P (Karlsruhe U.) ; Braune, K (LMU Munich (main)) ; Credé, V (U. Bonn (main)) ; Crowe, K M (LBNL, Berkeley) ; Doser, M (CERN) et al.
We report on a study of four reactions in $\bar{\mathrm p}{\mathrm p}$ annihilation at rest, of $\bar{\mathrm p}{\mathrm p} \rightarrow 2\pi^ + 2\pi^-\eta$, $\bar{\mathrm p}{\mathrm p} \rightarrow 2\pi^ + 2\pi^- 2\pi^0$, $\bar{\mathrm p}{\mathrm p} \rightarrow 2\pi^ + 2\pi^-\gamma$ and $\bar{\mathrm p}{\mathrm p}\rightarrow 4\pi^0\eta$. The $\eta^\prime$ and the $\eta$(1440) are seen in their decays into $\pi^ + \pi^-\eta$, $\pi^0\pi^0\eta$ and $\pi^ + \pi^-\gamma$ ; no signal is seen in the $4\pi$ invariant mass distribution. [...]
2004 - 8 p. - Published in : Eur. Phys. J. C 33 (2004) 23-30
2.
Accurate Mass Determinations in Decay Chains with Missing Energy / Cheng, Hsin-Chia (UC, Davis) ; Engelhardt, Dalit (Boston U.) ; Gunion, John F (UC, Davis) ; Han, Zhenyu (UC, Davis) ; McElrath, Bob (CERN)
Many beyond the Standard Model theories include a stable dark matter candidate that yields missing / invisible energy in collider detectors. If observed at the Large Hadron Collider, we must determine if its mass and other properties (and those of its partners) predict the correct dark matter relic density. [...]
arXiv:0802.4290.- 2008 - 4 p. - Published in : Phys. Rev. Lett. 100 (2008) 252001 APS Published version, local copy: PDF; External link: Fulltext
3.
Annihilation at rest of antiprotons and protons into neutral particles / Crystal Barrel Collaboration
Annihilation of antiprotons and protons at rest into neutral particles has been studied with the Crystal Barrel detector at LEAR. Annihilation frequencies are determined for final states containing π 0 , η , η ′ and ω mesons using a liquid and a room temperature, 12 bar, gaseous hydrogen target. [...]
2003 - Published in : Nucl. Phys. A 720 (2003) 357
4.
Coupled channel analysis of proton-antiproton annihilation into π0π0π0, π0ηη and π0π0η / Crystal Barrel Collaboration
We confirm the existence of the two I G ( J PC ) = 0 + (0 ++ ) resonances f 0 (1370) and f 0 (1500) reported by us in earlier analyses. The analysis presented here couples the final states π 0 π 0 π 0 , π 0 π 0 η and π 0 ηη of p p annihilation at rest. [...]
Amsterdam : Elsevier, 1995 - Published in : Phys. Lett. B 355 (1995) 425 Fulltext: PDF;
5.
Search for a new light gauge boson in π0, η and η' decays / Crystal Barrel Collaboration
Upper limits for the production of new light gauge bosons in π0, η and η′ decays have been obtained with the Crystal Barrel detector. The kinematically well-constrained reactions p̅p → π0π0 P have been studied, where P ? π 0, η, η′ decays through the emission of a single photon recoiling against a missing state X. [...]
1996 - Published in : Z. Phys. C 70 (1996) 219
6.
Proton-antiproton annihilation at rest into $K_{L}K^{±}\pi^{±}$ / Crystal Barrel Collaboration
Amsterdam : Elsevier, 1998 - Published in : Phys. Rev. D 57 (1998) 3860 APS Published version, local copy: PDF;
7.
Possible alpha-particle cluster absorption of pions by $^{16}O$ / Lewis, C W ; Boschitz, E T ; Engelhardt, H D ; Ullrich, H
It is shown that /sup 12/C 4.44 MeV gamma -rays result from pi /sup -/ absorption at rest in /sup 16/O. The /sup 12/C recoil momentum distribution was determined from the Doppler-broadening and compared with (p, p alpha ) measurements on /sup 16/O. [...]
1973 - Published in : Phys. Lett. B 47 (1973) 339-41
8.
Neutron-pair emission following pi /sup -/ absorption on some light nuclei / Furic, M ; Bassalleck, B ; Engelhardt, H D ; Klotz, W D ; Takeutchi, F ; Ullrich, H
Large-area position-sensitive neutron counters with subnanosecond time resolution have been used to study the ( pi /sup -/,2n) reaction with a resolution comparable to or better than the existing ( pi /sup + /,2p) data. The measurement of the momenta of both neutrons enabled a determination of the excitation energy spectra of the residual nuclei to be made. [...]
1977 - Published in : Fizika: 9 (1977) , pp. 66
In : 5th Meeting of Yugoslav Nuclear Physicists, Portoroz, Slovenia, 4 - 6 Nov 1976, pp.66
9.
Wide angular range study of the reaction /sup 16/O( pi /sup -/, 2n) /sup 14/N with stopped pions / Bassalleck, B ; Engelhardt, H D ; Furic, M ; Klotz, W D ; Lewis, C W ; Takeutchi, F ; Ullrich, H
A first kinematically complete investigation of the reaction /sup 16/O ( pi /sup -/, 2n)/sup 14/N with stopped pions has been performed at the CERN SC over a wide angular range. Measured distributions in excitation energy of the residual nucleus, recoil momentum, and angle between the two neutrons are presented. [...]
1980 - Published in : Nucl. Phys. A 343 (1980) 365-81
10.
Results from an extensive study of the ( pi /sup -/, 2n) reaction / Bassalleck, B ; Engelhardt, D ; Furic, M ; Klotz, W D ; Takeutchi, F ; Ullrich, H
Abstract only given, substantially as follows: An extensive study of the ( pi /sup -/,2n) reaction with stopped pi /sup -/ was completed at the CERN-SC. Target nuclei were from the 1p-shell ranging from /sup 6 /Li to /sup 16/0 and also /sup 40/Ca. [...]
1979 - Published in : AIP Conf. Proc.: 64 (1979) , pp. 174-5
In : 2nd International Topical Conference on Meson Nuclear Physics, Houston, TX, USA, 5 - 9 Mar 1979, pp.174-5

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3 Engelhardt, D.
4 Engelhardt, Dalit
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