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Neutrino (Antineutrino) scattering

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Presentation on theme: "Neutrino (Antineutrino) scattering"— Presentation transcript:

1 Neutrino (Antineutrino) scattering
on the nucleon with strangeness form factors in the context of the recent MiniBooNE and NOMAD experiments Ghil-Seok Yang (SSANP: Soongsil Univ. Astro-Nuclear Physics Group) Soongsil University, Seoul in collaboration with Myung-Ki Cheoun (SSU ANP) Kyungsik Kim (KAU) HaPhy, 18 July APCTP

2 Why we consider neutrinos(ν) ?
● Neutrinos can interact with other matter through weak force. ● Very small cross-section ● Extremely small mass. However, Tremendous numbers of ν and ν are produced in the collapsing stellar core. Also 99% of the energy is carried away by ν and ν from a core-collapse SN . (1046 Joule: 10% mass of SN left, 10 sec) Woosley, S. (2005), Nature Physics 1 (3): 147–154, Barwick, S.; et al., APS Neutrino Study, S. Myra Astrophysical Journal 364: 222–231 “Inelastic neutral current neutrino scattering off nuclei” The excitation of particle unbound states that decay by neutron, proton, or α-emission

3 Axial-mass, Strange couplings
ν -induced Nucleosynthesis layer structure (Prof. Kwak) + Nuclear network-cal. (SSU) MSW, ν-oscillation,… (NAOJ, PEHLIVAN) Fig. from Prof. Kajino (NAOJ, Tokyo U.) ν-A QE Scattering with Axial-mass, Strange couplings by Nuclear Structure effect (RFG, …) + Flux

4 𝜈 𝜇 , 𝜈 𝜇 charged-current (CC) quasielastic (CCQE) scattering
ν-N (quasi)elastic scattering in MiniBooNE and NOMAD 𝜈 𝜇 , 𝜈 𝜇 charged-current (CC) quasielastic (CCQE) scattering 𝜈 𝜇 , 𝜈 𝜇 Neutral-current (NC) quasielastic (NCQE) scattering

5 Summary of axial mass, MA experiments
MA = ~ 1.32 GeV ? OPEN PROBLEM !

6 Theoretical framework for neutrino scattering with nuclei
Standard electro-weak theory where

7 Relativistic Fermi Gas (RFG) Model
ν-Nuclear target reaction (RFG) : Smith, Moniz (SLAC, 1972) First study with nucleon strangeness : H.C.Kim, Horowitz (1993, 1995) for ν-N CCQE

8 Neutrino Flux (2010, MiniBooNE)
ν-Nuclear target reaction (RFG) : Smith, Moniz (SLAC, 1972) First study with nucleon strangeness : H.C.Kim, Horowitz (1993, 1995) for ν-N CCQE

9 Result (CC) RFG + Flux + MA Differential cross section
With 𝑴𝑨 = 𝟏.𝟎𝟑 𝑮𝒆𝑽 Differential cross section for the 𝝂 𝝁 , 𝝂 𝝁 CCQE process from MiniBooNE RFG + Flux + MA ­━━ 𝝂 𝝁 flux-folded 𝝂 𝝁 flux-unfolded ━━ 𝝂 𝝁 flux-folded 𝝂 𝝁 flux-unfolded With 𝑴𝑨 = 𝟏.30 𝑮𝒆𝑽 ­━━ 𝝂 𝝁 flux-folded 𝝂 𝝁 flux-unfolded ━━ 𝝂 𝝁 flux-folded 𝝂 𝝁 flux-unfolded

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11 RFG model estimated by MiniBooNe, 2013

12 Total cross section for the 𝝂 𝝁 , 𝝂 𝝁 CCQE process from MiniBooNE, NOMAD
­ 𝝂 𝝁 ( 𝑴 𝑨 =𝟏.𝟑𝟎 GeV) ━━ 𝝂 𝝁 ( 𝑴 𝑨 =𝟏.𝟎𝟑 GeV) 𝝂 𝝁 ( 𝑴 𝑨 =𝟏.𝟑𝟎 GeV) ━━ 𝝂 𝝁 ( 𝑴 𝑨 =𝟏.𝟎𝟑 GeV) Cheoun, Kim J. Phys. G: Nucl. Part. Phys. 42 (2015)

13 free nucleon target + dipole FF Form factor problem ???
Gaisser, O’Connell, Phys. Rev D 34, 822 (1986) free nucleon target + modified dipole FF

14 flux-folded flux-folded
sin 𝟐 𝜃 𝑊 →0.23, F1s → 0.5, μs → 0.4, 𝒈 𝑨 𝒔 → 0.2 ━━ : Exp. from MiniBooNE ----- : 𝑴 𝑨 =𝟏.𝟎𝟑 𝐆𝐞𝐕 ­········ : 𝑴 𝑨 =𝟏.𝟑𝟎 GeV flux-folded flux-folded

15 flux-folded flux-folded
sin 𝟐 𝜃 𝑊 →0.23, F1s → 0.5, μs → 0.4, 𝒈 𝑨 𝒔 → 0.2 flux-folded ━━ : Exp. from MiniBooNE ----- : 𝑴 𝑨 =𝟏.𝟎𝟑 𝐆𝐞𝐕 ­········ : 𝑴 𝑨 =𝟏.𝟑𝟎 GeV flux-folded

16 Summary Thank you 감사합니다 Danke schön
Investigated the ν-N QE scattering for CC and NC reactions within electroweak theory and FG considering ν flux Nuclear structure is significant for describing the exp.data. MA and strangeness couplings are crucial for ν-N QE ANC/CC, RNC/CC give us more precise strangeness information ν-N scattering will be studied with Massive Neutrino, Majorana particle and High-Energy reaction and will be applied to SuperNova nucleosynthesis Thank you Danke schön 감사합니다

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