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Dive into the research topics where C. Hodd is active.

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Featured researches published by C. Hodd.


Physics Letters B | 1997

Measurement of the decay distribution of η′ → π+π−γ and evidence for the box anomaly

Andreas Abele; J. Adomeit; C. Amsler; C. A. Baker; B.M. Barnett; C. J. Batty; M. Benayoun; A. Berdoz; K. Beuchert; S. Bischoff; Philipp Blum; K. Braune; J. Brose; D.V. Bugg; T. Case; A. Cooper; O. Cramer; K.M. Crowe; T. Degener; N. Djaoshvili; S.v. Dombrowski; M. Doser; W. Dünnweber; D. Engelhardt; M. Faessler; P. Giarritta; R. Hackmann; R.P. Haddock; F.H. Heinsius; Michael Heinzelmann

Abstract The distribution of m ( π + π − ) in the decay η ′ → π + π − γ has been measured with the Crystal Barrel detector. The results are based on a total of 7392 observed η′ decays. The box anomaly constant is extracted from this and its value is found to agree well with theoretical expectations. The pseudoscalar nonet parameters ( f 1 , f 8 and θ PS ) are determined. Finally, we find that there is a problem of consistency between QCD and the standard VDM assumption.


Physics Letters B | 1999

EVIDENCE FOR A JPC = 1++ I = 1 MESON AT 1640 MEV

C. A. Baker; C. J. Batty; Philipp Blum; D.V. Bugg; R.P. Haddock; C. Hodd; C. Holtzhaußen; L. Montanet; D. Odoom; C.N. Pinder; I. J. G. Scott; B. S. Zou

Abstract From an analysis of p p→4π 0 at a beam momentum of 1940 MeV/c, we find evidence for a J PC =1 ++ resonance at 1640 ±12( stat )±30( syst ) MeV with Γ =300±22±40 MeV; it is observed decaying both to σπ with L =1 and to f 2 (1270) π with L =1.


Physics Letters B | 1998

Decay dynamics of the process η→3π0

Andreas Abele; C.J. Batty; D.V. Bugg; C. Kolo; J.S. Suh; U. Strohbusch; K.M. Crowe; B. Kaemmle; M. Suffert; P. Kammel; C. Strassburger; Dirk Walther; U. Thoma; D. Engelhardt; Michael Heinzelmann; T. Degener; N. Djaoshvili; H. Kalinowsky; R. Seibert; N.P. Hessey; C. Hodd; C. Pietra; A. Ehmanns; R. Landua; U. Kurilla; E. Klempt; O. Cramer; W. Dünnweber; A. Herbstrith; Steve G. Wallis

Abstract The parameter α =−0.052±0.020 describing the shape of the η →3 π 0 Dalitz plot has been determined using the data from the Crystal Barrel detector at LEAR. The value is compared to predictions of chiral perturbation theory.


Physics Letters B | 1998

Momentum dependence of the decay η→π+π−π0

Andreas Abele; C.J. Batty; D.V. Bugg; C. Kolo; U. Strohbusch; K.M. Crowe; B. Kaemmle; M. Suffert; P. Kammel; C. Strassburger; D. Walther; U. Thoma; D. Engelhardt; Michael Heinzelmann; T. Degener; N. Djaoshvili; C. Völcker; H. Kalinowsky; R. Seibert; N.P. Hessey; C. Hodd; C. Pietra; A. Ehmanns; R. Landua; U. Kurilla; E. Klempt; O. Cramer; W. Dünnweber; A. Herbstrith; Steve G. Wallis

Abstract The π 0 momentum dependence of the decay η → π + π − π 0 has been measured with the Crystal Barrel detector. The analysis is based on 3230 events. The results of this independent measurement are compared to new chiral perturbation theory calculations and previous measurements.


Physics Letters B | 1999

OBSERVATION OF F0 (1770) ETA ETA IN PP ETA ETA PI 0 REACTIONS FROM 600 TO 1200 MEV/C

A. V. Anisovich; C. A. Baker; C. J. Batty; D.V. Bugg; R.P. Haddock; C. Hodd; V. A. Nikonov; A. V. Sarantsev; V.V. Sarantsev; I. J. G. Scott; B. S. Zou

We present data on pbar-p -> eta-eta-pizero at beam momenta of 600, 900, 1050, and 1200 MeV/c. At the higher three momenta, a signal is clearly visible due to pbar-p -> f_0(1770)-pizero, f_0(1770) -> eta-eta. It has mass 1770+-12 MeV and width 220+-40 MeV, where errors cover systematic uncertainties as well as statistics.


Physics Letters B | 1999

and π0η′ from 600 to 1940 MeV/c

A. V. Anisovich; C. A. Baker; C. J. Batty; D.V. Bugg; C. Hodd; J. Kisiel; V. A. Nikonov; A. V. Sarantsev; V.V. Sarantsev; I. J. G. Scott; B. S. Zou

Data taken with the Crystal Barrel detector on and π0η′ are presented at p momenta from 600 to 1940 MeV/c. A partial wave analysis finds two alternative solutions, one significantly preferred over the other. Both contain resonances of similar masses and widths, but different coupling constants and phases. The favoured solution contains a JPC=0++ resonance at 2025±30 MeV with Γ=330±75 MeV, and three 2++ resonances as follows: (i) at 1990+15−30 MeV with Γ=190±50 MeV (dominantly ), (ii) at 2060±20 MeV with Γ=195±30 MeV (dominantly ), (iii) at 2265±20 MeV with Γ=235+60−35 MeV (dominantly ), There are two 4++ resonances at 2025±40 MeV with Γ=250+80−55 MeV and at 2300±20 MeV with Γ=230±40 MeV. Errors cover systematic errors and statistical fluctuations of 3σ.


Physics Letters B | 1999

Study of p̄p→π0π0η from 600 to 1940 MeV/c

A. V. Anisovich; C. A. Baker; C. J. Batty; D.V. Bugg; C. Hodd; J. Kisiel; V. A. Nikonov; A. V. Sarantsev; V.V. Sarantsev; I. J. G. Scott; B. S. Zou

Abstract Antiproton-proton annihilation into π 0 π 0 η has been studied with incident beam momenta of 0.6 to 1.94 GeV/c. The main aim is to look for resonances formed by p p and decaying into π 0 π 0 η . Resonances observed are: two 4 ++ resonances with mass and width (M, Γ ) at (2044, 208) MeV and (2320±30, 220±30) MeV; three 2 ++ resonances at (2020±50, 220±70) MeV, (2240±40, 170±50) MeV and (2370±50, 320±50) MeV; two 3 ++ resonances at (2000±40, 250±40) MeV and (2280±30, 210±30) MeV; a 1 ++ resonance at (2340±40, 340±40) MeV; and two 2 −+ resonances at (2040±40, 190±40) MeV and (2300±40, 270±40) MeV.


Nuclear Physics | 1999

Resonances formed by and decaying into π0π0η for masses 1960 t0 2410 MeV

A. V. Anisovich; C. A. Baker; C. J. Batty; D.V. Bugg; C. Hodd; J. Kisiel; V.A. Nikonov; A. V. Sarantsev; V.V. Sarantsev; I. J. G. Scott; B. S. Zou

Abstract Data on p p annihilation in flight into π0π0η are presented for nine beam momenta 600 t0 1940 MeV/c. The strongest four intermediate states are found to be f2(1270)η, a2(1320)π, ση and a0(980)π. Partial wave analysis is performed mainly to look for resonances formed by p p and decaying into π0π0η through these intermediate states. There is evidence for the following s-channelI = 0 resonances: two 4++ resonances with mass and width (M, Γ) at (2044, 208) MeV and (2320±30, 220±30) MeV; three 2++ resonances at (2020±50, 200±70) MeV, (2240±40, 170±50) MeV and (2370±50, 320±50) MeV; two 3++ resonances at (2000±40, 250±40) MeV and (2280±30, 210±30) MeV; a 1++ resonance at (2340±40, 340±40) MeV; and two 2−+ resonances at (2040±40, 190±40) MeV and (2300±40, 270±40) MeV.


Physics Letters B | 2000

Three I=0 JPC=2−+ mesons

A. V. Anisovich; C. A. Baker; C. J. Batty; D.V. Bugg; A. Cooper; C. Hodd; V. A. Nikonov; A. V. Sarantsev; V.V. Sarantsev; B. S. Zou

Abstract High statistics data on p p→ηπ 0 π 0 π 0 at nine beam momenta from 900 to 1940 MeV/c require the presence of three I =0, J PC =2 −+ mesons with masses and widths (i) M =1645±6(stat)±20(syst) MeV, Γ =200±7±20 MeV, (ii) M =1860±5±15 MeV, Γ =250±25±25 MeV, (iii) M =2030±5±15 MeV, Γ =205±10±15 MeV. The η 2 (1645) and η 2 (2030), together with η 2 (2300) observed earlier, may be interpreted as a sequence of expected q q states. The η 2 at 1860 MeV appears to be an extra state, hence a candidate for a hybrid. Decay branching ratios of all three states to a 2 (1320) π , f 2 (1270) η and a 0 (980) π are established. The η 2 at 1860 MeV decays dominantly to f 2 η and a 2 π , as predicted for a hybrid. The η 2 (2030) decays dominantly to a 2 π with orbital angular momentum L =2 and slightly less strongly to a 2 π with L =0.


Physics Letters B | 1999

Study of the process from 1350 to 1940 MeV/c

A.V. Anisovich; C. A. Baker; C. J. Batty; D.V. Bugg; R.P. Haddock; C. Hodd; V. A. Nikonov; C.N. Pinder; A. V. Sarantsev; V.V. Sarantsev; I. J. G. Scott; B. S. Zou

Abstract Data on the final state ηηπ 0 are presented for beam momenta of 1350, 1525, 1642, 1800 and 1940 MeV/ c . There is evidence for the presence of a broad high mass 2 + contribution in ηη ; the amplitude analysis fits it as a resonance with mass M =1980±50 MeV and width Γ =500±100 MeV. It has the curious feature that it is produced dominantly with orbital angular momentum L =1 in the final state and with component of spin ±1 along the beam direction. It contributes typically ∼15−20% of the integrated cross section. In addition, the presence of a 2 (1660) is confirmed at all beam momenta. Also f 0 (2100)→ ηη is confirmed.

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D.V. Bugg

Queen Mary University of London

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C. A. Baker

Rutherford Appleton Laboratory

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C. J. Batty

Rutherford Appleton Laboratory

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B. S. Zou

Queen Mary University of London

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T. Degener

Ruhr University Bochum

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Andreas Abele

Karlsruhe Institute of Technology

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K.M. Crowe

University of California

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R.P. Haddock

University of California

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