RevModPhys.84.1307

Additional nuclear targets are clearly needed to help

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: es of photon production in deep inelastic neutrino interactions have been performed at higher energies 0.3 0) (10-38 cm2 / nucleon) targets, measuring and modeling nuclear effects in pion production processes has become paramount. Such effects are sizable, not well known, and ultimately complicate the description of neutrino interactions. Once created in the initial neutrino interaction, the pion must escape the nucleus before it can be detected. Along its journey, the pion can rescatter, get absorbed, or charge exchange thus altering its identity and kinematics. Improved calculations of such ‘‘final-state interactions’’ have been undertaken by a number of groups (Paschos et al., 2007; Antonello et al., 2009; Dytman, 2009; Leitner and Mosel, 2009; Leitner and Mosel, 2010a, 2010b). The impact of in-medium effects on the Á width and the possibility for intranuclear Á reinteractions (ÁN ! NN ) also play a role. The combined result are sizable distortions to the interaction cross section and kinematics of final-state hadrons that are produced in a nuclear environment. While new calculations of pion production have proliferated, new approaches to the experimental measurement of these processes have also surfaced in recent years. Modern 0 1 10 10 2 E (GeV) FIG. 17. Existing measurements of the cross section for the NC process,  p !  p0 , as a function of neutrino energy. Also " " shown is the prediction from Casper (2002) assuming MA ¼ 1:1 GeV. Modern measurements (Table XII) exist but cannot be directly compared with this historical data. 0.25 0.2 GGM, NP B135, 45 (1978), C H8 CF3Br 3 NUANCE (M =1.1 GeV) A - 0.15 0.1 ANL, PL 92B, 363 (1980), D 0.25 ( µn 0 1 3 0.2 NUANCE (M =1.1 GeV) A 0.15 0.1 10 10 0 1 2 ) (10-38 cm2 / nucleon) 0.7 0.2 0.15 µ+ p FIG. 20. Existing measurements of the cross section for the NC process,  n !  pÀ , as a function of neutrino energy. Also shown is the prediction from Casper (2002) assuming MA ¼ 1:1 GeV. 0.1 p FIG. 18. Existing measurements of the cross section for the NC process,  n !  n0 , as a function of neutrino energy. Also shown is the prediction from Casper (2002) assuming MA ¼ 1:1 GeV. The Gargamelle measurement comes from a more recent reanalysis of these data. Modern measurements (Table XII) exist but cannot be directly compared with this historical data. From Hawker, 2002. 0 0.3 3 NUANCE (M =1.1 GeV) A ( µn 0.2 GGM, NP B135, 45 (1978), C H8 CF3Br 0.5 FNAL, PL 91B, 161 (1980), H 2 BEBC, NP B343, 285 (1990), D 2 NUANCE (M =1.1 GeV) A 0.4 0.3 0.1 1 10 10 2 E (GeV) 0.05 ( µp GGM, PL 81B, 393 (1979), C H8 CF3Br 3 0.6 - 0.25 µ (10-38 cm2 / nucleon) 10 2 10 E (GeV) E (GeV) +) 2 GGM, NP B135, 45 (1978), C H8 CF3Br 0.05 0.05 ( µn 0.3 µp (10-38 cm2 / nucleon) 0.3 µn 0) ) (10-38 cm2 / nucleon) Joseph A. Formaggio and G. P. Zeller: From eV to EeV: Neutrino cross sections . . . 1330 0 1 10 10 2 E (GeV) FIG. 19. Existing measurements of the cross section for the NC process,  p ! ...
View Full Document

Ask a homework question - tutors are online