The data is from runs 20140 and 20111 (1 file) for a total of 547.291 triggers.
The photon hits were taken from the TAGR bank using the ones with status 7 and 15. For
status 15 hits (that is multiple hits on the tagger) the photon into into the ST
time distribution (+/- 5ns) were considered.
With these cuts the total number of reconstructed photons is 255.960 (47%).
Only the PART bank was considered with the condition that the quality factor for the
neutrals different from 999999.
The good events are 34% of the total number of triggers.
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Missing mass spectrum for gamma d -> p X(n) Black Line = all (fast) proton events; Red Line = (Black line) with proton TBT vertex from the target region Green Line = (Red line) with only one charged track in the final state; |
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Reconstructed particles from P.I.D. in the three cases chown before. In the first two plots the presence of deuterons is not possible since the events already has an identified proton. |
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Missing mass for gamma d -> p X(n) versus teta in the CLAS system. The photodisintegation events are along the line corresponding to the neutron mass. The diagonal line starting from the ~1.2 GeV corresponds to events in which the final state is composed by a fast nucleon which had interaction with the gamma and a pion (the other nucleon is not detected). This is in agreement with the MC simulations. |
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Missing mass for gamma d -> p X(n) versus detected proton momentum. Protons coming from the photodisintegration channel are at small teta and large p. |
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Missing Mass for gamma d -> p X(n) versus photon energy. |
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Proton momentum as a function of teta angle in CLAS for photodisintegration protons. The solid lines come from cinematic limits corresponding to the two extreme gamma energies. |
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Pi0 invariant mass spectra. |
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Momentum of the 2gamma invariant mass as a function of the teta angle of the 2 gammas in the CLAS system. The solid line represents the maximum of the Pi0 momentum distribution (calculated from (m(pi0)^2)/(8 P(pi0) E(pi0)) / ( sen^3(teta/2) * sqrt(sen^2(teta/2)-(m(pi0)/E(pi0))^2)) )) as a function of teta. |