Strange-particle production in neutrino-neon charged-current interactions

Abstract

I. INTRODUCTION. Neutral strange particle production in charged-current v interactions have been studied in the Fermilab 15-foot neon bubble chamber. The reactions studied included: i/ + Ne-> iu"K°X, K°-> x + n~ 2279 decays v + Ne-> ,u"A X, A°-> *•" p 1843 decays v + Ne-> p.'K X, A 0-> JT + p 93 decays Associated production is expected to be the major source of strange particles in charged-current neutrino interactions since the d-quark is the only valence quark the neutrino interacts with, and makes a strange quark only via a Cabibbo disfavored process; strange quarks must be ejected from the sea. Other processes, such as charm production and interactions with sea quarks are expected to be small. The sample described here, from 61,800 charged-current events, is used to provide insight into these ideas. Other topics include: UlSTmBUTTON OF THIS DOCUMENT t& Strange Particle Production v 2%^ R. Piano/Rutgers U.

Measurement ofK+production in charged-currentνμinteractions

“…This result provides a constraint on strange particle production by neutrinos that complements existing measurements of K 0 S and Λ production in bubble chambers [36][37][38][39][40][41] and NOMAD [53]. It provides an additional constraint on K + FSI, suggesting that modifications to the signal spectrum in p → K + ν due to kaon rescattering are well-modeled in genie.…”

“…In the intermediate region 2.3 < W < 3.0 GeV, the AGKY model [35] governs the transition between KNO and PYTHIA6. Parameters which control the rate of strange particle production in hadronization are tuned such that rates of Λ and K 0 S production on deuterium and nuclei agree with BEBC [36][37][38][39] and Fermilab 15' [40,41] bubble chamber measurements as a function of W . All events in genie 2.8.4 are ∆S = 0, so there is always another strange particle in the final state in addition to the K + .…”

Measurement of charged kaon production by neutrinos at MINERvA

“…Strange particle production by neutrinos has previously been observed in bubble chambers [60,61,62,63,64,65,66,67,68,69,70] and the straw tube detector NOMAD [71]. Bubble chambers have exquisite position resolution, and are fantastic detectors for Λ and K 0 S , neutral particles which travel a few centimeters before decaying.…”

Measurement of Neutral-Current K+ Production by Neutrinos using MINERvA

“…Strange particle production by neutrinos has previously been observed in bubble chambers [21][22][23][24][25][26][27][28][29][30][31] and in NOMAD [32]. Gargamelle observed three NC K + production events [31], and reported a neutral-to chargedcurrent ratio for strangeness production.…”

“…Hadronization at higher energies is simulated with the AGKY model [47] based on the gradual transition from KNO scaling [45] to the Lund string model of PYTHIA (version 6) [46] with increasing W . Parameters that control the rate of strange particle production in hadronization are tuned such that rates of Λ and K 0 S production on deuterium and neon agree with BEBC [21][22][23][24] and Fermilab 15' [25,26] bubble chamber measurements. FSI are modeled using the INTRANUKE package [42,48].…”