Measurement of inclusive neutron spectra at the ISR

LHC as π p and π π collider

“…The functions Φ 0 and Φ s arise from different spin contributions to the amplitude (19) and both are equal to Φ B in the Born approximation. Herê σ i are Pauli matrices andΨ n , Ψ p are neutron and proton spinors.…”

“…The process of leading neutron production has been studied at several experiments in photon-hadron [10][11][12][13][14][15][16][17] and hadron-hadron [18][19][20][21][22][23][24] colliders. In this paper we consider processes of the type p + p → n + X and p + p → n + X + n. As was noted in [25], the experimental study of charge exchange in hadron-hadron collisions is not so clear.…”

Pion fluctuation in deep inelastic scattering

“…The forward neutron production with the aim to observe the pion fluctuation has already been studied previously in the high-energy pp-reaction at ISR in CERN [10]. But the rescattering of proton on the virtual neutron is so strong that a reliable estimate of the probability of the p → π + n fluctuation was not possible.…”

Results of the LHCf experiment and the forward measurements at the LHC

“…Here the Feynman x, x F , is defined as 2 p z / √ s. The comparison shows a good agreement of the differential cross sections at the 20% level, indicating the existence of Feynman scaling [26]. On the other hand, when we compare the forward neutron cross sections between ISR at 30-60 GeV [27,28], PHENIX at 200 GeV [29] and LHCf at 7 TeV [22], the ISR and PHENIX results show a good scaling, but the LHCf result indicates a break of the scaling [30]. To test the Feynman scaling or its breaking, experiments at wider √ s coverage are important.…”