Slow proton production in semi-inclusive deep-inelastic neutrino scattering on hydrogen and deuterium

We discuss baryon production in the nucleon fragmentation region in deep inelastic scattering. The dependence of the nucleon spectra on Bjorken-x is evaluated within the parton model and in QCD, and ways to look for the break-down of the DGLAP approximation via baryon production are suggested. We argue also that the leading neutron production in these small x processes is rather insensitive to the pion parton densities of the nucleon.

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“…This expectation is consistent with bubble chamber neutrino data, which were analyzed, for instance, in Ref. [19].…”

Section: Qcd Radiation Effectssupporting

confidence: 91%

Soft-hard interplay and factorization for baryon production in the target fragmentation region in ep collisions

1997

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“…Current theoretical models of this process are based upon the impulse approximation (IA) (or the the spectator model ), according to which: i) X results from DIS off one of the two nucleons in the deuteron, ii) the second nucleon N recoils without interacting with X and is detected in coincidence with the scattered electron (for an exhaustive review see [9]). The model has been improved by considering that the detected nucleon could also originate from quark hadronization [10,11], and has also been extended to complex nuclei by considering the process A(e, e ′ N)X, by assuming that DIS occurs on a nucleon of a correlated pair, with the second nucleon N recoiling and detected in coincidence with the scattered electron [11].…”

Section: Introductionmentioning

confidence: 99%

Final-state interaction in semi-inclusive DIS off nuclei

Atti

Kopeliovich

2003

Eur Phys J A

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The final state interaction (FSI) in Deep Inelastic Scattering (DIS) of leptons off a nucleus A, due to the propagation of the struck nucleon debris and its hadronization in the nuclear environment is considered. The effective cross section of such a partonic system with the nucleons of the medium and its time dependence are estimated, for different values of the Bjorken scaling variable, on the basis of a model which takes into account both the production of hadrons due to the breaking of the color string, which is formed after a quark is knocked out off a bound nucleon, as well as the production of hadrons originating from gluon radiation. It is shown that the interaction, the evolution and the hadronization of the partonic system in the nuclear environment can be thoroughly investigated by a new type of semi-inclusive process, denoted A(e, e ′ (A − 1))X, in which the scattered lepton is detected in coincidence with a heavy nuclear fragment, namely a nucleus A − 1 in low energy and momentum states. As a matter of fact, if FSI is disregarded, the momentum distribution of A − 1 is directly related to the momentum distribution of the nucleon before γ * absorption, i.e. the same quantity which appears in the conventional A(e, e ′ N )X process, where N denotes a nucleon. The rescattering of the struck nucleon debris with the medium damps and distorts the momentum distributions of A − 1 in a way which is very sensitive to the details of effective cross section of the debris with the nucleons of the medium. The total cross section of the process A(e, e ′ (A − 1))X on 4 He, 16 O, and 40 Ca, related to the probability that after a target nucleon experiences a DIS process, the recoiling A − 1 nucleus remains intact in spite of the strong FSI, is evaluated, and the distorted momentum distribution of the recoiling A − 1 system is obtained. It is shown that both quantities are very sensitive to the details of the early stage of hadronization of the nucleon debris in the nuclear medium.2

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“…Although recent calculations [16] and experimental data [17] seem to indicate that FSI on a complex nucleus are small in semi inclusive DIS, particularly when the low momentum hadrons are detected backward, the situation is not clearly settled, and therefore the observation of protons and deuterons emitted backward in the processes D(e, e ′ p)X, 3 He(e, e ′ D)X with a | P A−1 | dependence shown in Fig.2, would represent strong indication of the absence of FSI. The situation here is different from the usually investigated semi-inclusive DIS processes A(e, e ′ N)X where the detected nucleon can originate not only from a correlated pair, as originally suggested [2], but from competitive processes as well, such as nucleon current and target fragmentations [4,5].…”

Section: The Nuclear Spectral Functionmentioning

confidence: 60%

“…The measurement of the quantity R shown in Fig. 2 would imply the detection, in coincidence with scattered electrons, of backward recoiling , with momentum P A−1 , protons, deuterons, 3 He and 12 C nuclei resulting from the processes D(e, e ′ p)X, 3 H(e, e ′ D)X, 4 He(e, e ′3 He)X and 12 C(e, e ′11 C)X, respectively, with the DIS scattering processes supposed to occur on a neutron.…”

Section: The Nuclear Spectral Functionmentioning

confidence: 97%

“…Current theoretical models of this process are based upon the impulse approximation (IA) (also called the spectator model ), according to which X results from DIS on one of the two nucleons in the deuteron, with N recoiling without interacting with X and being detected in coincidence with the scattered electron (for an exhaustive review see [2]). The model has been improved by introducing FSI [3], as well as by considering deviations from the spectator model by assuming that the detected nucleon originates from quark hadronisation [4,5]. The semiinclusive process on the deuteron D(e, e ′ N)X, on which experimental data will soon be available [6], could not only clarify the origin of the EMC effect, but, as illustrated in [7], could also provide more reliable information on the neutron structure function.…”

Section: Introductionmentioning

confidence: 99%

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Semi-inclusive deep inelastic lepton scattering off complex nuclei

Atti

Kaptari

Scopetta

1999

EPJ A

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It is shown that in semi-inclusive deep inelastic scattering (DIS) of electrons off a complex nucleus A, the detection, in coincidence with the scattered electron, of a nucleus (A − 1) in the ground state, as well as of a nucleon and a nucleus (A − 2), also in the ground state, may provide unique information on several long standing problems, such as : i) the nature and the relevance of the final state interaction in DIS; ii) the validity of the spectator mechanism in DIS; iii) the medium induced modifications of the nucleon structure function; iv) the origin of the EM C effect.

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Slow proton production in semi-inclusive deep-inelastic neutrino scattering on hydrogen and deuterium

Cited by 9 publications

References 30 publications

Soft-hard interplay and factorization for baryon production in the target fragmentation region in ep collisions

Soft-hard interplay and factorization for baryon production in the target fragmentation region in ep collisions

Final-state interaction in semi-inclusive DIS off nuclei

Semi-inclusive deep inelastic lepton scattering off complex nuclei

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