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論文

First measurement of missing energy due to nuclear effects in monoenergetic neutrino charged-current interactions

Marzec, E.*; 百々 拓; 羽賀 勝洋; 原田 正英; 長谷川 勝一; 春日井 好己; 木下 秀孝; 増田 志歩; 明午 伸一郎; 酒井 健二; et al.

Physical Review Letters, 134, p.081801_1 - 081801_9, 2025/00

https://doi.org/10.1103/PhysRevLett.134.081801
 被引用回数：1 パーセンタイル：0.00(Physics, Multidisciplinary)

We present the first measurement of the missing energy due to nuclear effects in monoenergetic, muon neutrino charged-current interactions on carbon, originating from $$K^+ to mu^+ nu_{mu}$$ decay at rest ($$E_{nu_{mu}} = 235.5 MeV$$), performed with the J-PARC Sterile Neutrino Search at the J-PARC Spallation Neutron Source liquid scintillator based experiment. Toward characterizing the neutrino interaction, ostensibly $$nu_{mu}n to mu^- p$$ or $$nu_{mu}$$ $$^{12}$$C $$to$$ $$mu^-$$ $$^{12}$$N, we define the missing energy as the energy transferred to the nucleus ($$omega$$) minus the kinetic energy of the outgoing proton(s), $$E_m equiv omega - Sigma T_p$$, and relate this to visible energy in the detector, $$E_m = E_{nu_{mu}} (235.5 MeV) - m_{mu}(105.7 MeV) + [m_n - m_p(1.3 MeV)] - E_{vis}$$. The missing energy, which is naively expected to be zero in the absence of nuclear effects (e.g., nucleon separation energy, Fermi momenta, and final-state interactions), is uniquely sensitive to many aspects of the interaction, and has previously been inaccessible with neutrinos. The shape-only, differential cross section measurement reported, based on a $$(77pm 3%)$$ pure double-coincidence kaon decay-at-rest signal (621 total events), provides detailed insight into neutrino-nucleus interactions, allowing even the nuclear orbital shell of the struck nucleon to be inferred. The measurement provides an important benchmark for models and event generators at hundreds of MeV neutrino energies, characterized by the difficult-to-model transition region between neutrino-nucleus and neutrino-nucleon scattering, and relevant for applications in nuclear physics, neutrino oscillation measurements, and Type-II supernova studies.

論文

Measurement of jet-medium interactions via direct photon-hadron correlations in Au+Au and $$d$$+Au collisions at $$sqrt{s_{_{NN}}}=200$$ GeV

Acharya, U.*; 長谷川 勝一; 今井 憲一*; 永宮 正治*; 佐甲 博之; 佐藤 進; 谷田 聖; PHENIX Collaboration*; 他572名*

Physical Review C, 102(5), p.054910_1 - 054910_11, 2020/11

AA2021-0362.pdf:1.31MB

https://doi.org/10.1103/PhysRevC.102.054910
 被引用回数：5 パーセンタイル：43.59(Physics, Nuclear)

We present direct photon-hadron correlations in 200 GeV/A Au$$+$$Au, $$d$$$$+$$Au and $$p$$$$+$$$$p$$ collisions, for direct photon $$p_T$$ from 5 - 12 GeV/$$c$$, collected by the PHENIX Collaboration in the years from 2006 to 2011. We observe no significant modification of jet fragmentation in $$d$$$$+$$Au collisions, indicating that cold nuclear matter effects are small or absent. Hadrons carrying a large fraction of the quark's momentum are suppressed in Au$$+$$Au compared to $$p$$$$+$$$$p$$ and $$d$$$$+$$Au. As the momentum fraction decreases, the yield of hadrons in Au$$+$$Au increases to an excess over the yield in $$p$$$$+$$$$p$$ collisions. The excess is at large angles and at low hadron $$p_T$$ and is most pronounced for hadrons associated with lower momentum direct photons. Comparison to theoretical calculations suggests that the hadron excess arises from medium response to energy deposited by jets.

論文

Observation of a vector charmoniumlike state in $$e^+e^- to D^+_sD_{s1}(2536)^-+c.c.$$

Jia, S.*; 谷田 聖; Belle Collaboration*; 他172名*

Physical Review D, 100(11), p.111103_1 - 111103_8, 2019/12

https://doi.org/10.1103/PhysRevD.100.111103
 被引用回数：27 パーセンタイル：76.37(Astronomy & Astrophysics)

Using a data sample of 921.9 fb$$^{-1}$$ collected with the Belle detector, we study the process of $$e^+e^-to D^+_sD_{s1}(2536)^-+c.c.$$ via initial-state radiation. We report the first observation of a vector charmoniumlike state decaying to $$D^+_sD_{s1}(2536)^-+c.c.$$ with a significance of 5.9$$sigma$$, including the systematic uncertainties. The measured mass and width are $$(4625.9^{+6.2}_{-6.0}({rm stat.})pm0.4({rm syst.}))~{rm MeV}/c^{2}$$ and $$(49.8^{+13.9}_{-11.5}({rm stat.})pm4.0({rm syst.}))~{rm MeV}$$, respectively. The product of the $$e^+e^-to D^+_sD_{s1}(2536)^-+c.c.$$ cross section and the branching fraction of $$D_{s1}(2536)^-to{bar D}^{*0}K^-$$ is measured from the $$D_s bar{D}_{s1}(2536)$$ threshold to 5.59 GeV.

論文

$$Lambda(1405)$$ spectroscopy via the in-flight $$d(K^-, n)$$ reaction at the J-PARC K1.8BR

川崎 新吾*; 橋本 直; 谷田 聖; 他72名*

JPS Conference Proceedings (Internet), 26, p.022009_1 - 022009_5, 2019/11

https://doi.org/10.7566/JPSCP.26.022009

The spectral shape of the $$Lambda(1405)$$ baryon was measured via the in-flight $$d(K^-, n)$$ reaction at the J-PARC K1.8BR beam-line (J-PARC E31). The second E31 physics run was carried out in January and February, 2018. Approximately $$3.9 times 10^{10}$$ kaons were irradiated on the deuteron target. The missing mass spectrum for the $$d(K^-, n)$$ where the residual final-state particles were $$Sigma^0$$ and $$pi^0$$ ($$d(K^-, n)$$"$$Sigma^0pi^0$$" spectrum) was measured for the first time.

論文

Spectroscopic study of the $$Lambda$$(1405) resonance via the $$d(K^-, n)$$ reaction at J-PARC

浅野 秀光*; 橋本 直; 谷田 聖; 他72名*

AIP Conference Proceedings 2130, p.040018_1 - 040018_6, 2019/07

https://doi.org/10.1063/1.5118415
 被引用回数：3 パーセンタイル：79.08(Physics, Nuclear)

The structure of the $$Lambda(1405)$$ hyperon is an important and long-standing issue related to the $$bar{K}$$-nucleus interaction. The J-PARC E31 experiment has been performed to investigate the $$Lambda(1405)$$ spectrum shape. Because it is hard to form the $$Lambda(1405)$$ directly by a $$bar{K}N$$ scattering in free space, E31 uses the $$d(K^-, n)$$ reaction with an incident kaon momentum of 1 GeV/$$c$$. We will identify three final states - $$Sigma^-pi^+$$, $$Sigma^+pi^-$$, $$Sigma^0pi^0$$ so that the isospin structure of hyperon resonance states produced can be decomposed. The first physics run of the E31 experiment was performed in 2016. To enhance the statistics of the data set, we have performed the second physics run in the beginning of 2018. During the second run of E31, around $$3.9 times 10^{10}$$ kaons impacted on the deuteron target.

論文

Search for the $$B to Y(4260) K, Y(4260) to J/psi pi^+pi^-$$ decays

Garg, R.*; 谷田 聖; Belle Collaboration*; 他172名*

Physical Review D, 99(7), p.071102_1 - 071102_8, 2019/04

AA2019-0539.pdf:0.41MB

https://doi.org/10.1103/PhysRevD.99.071102
 被引用回数：5 パーセンタイル：26.31(Astronomy & Astrophysics)

We report the results of a search for the $$B to Y(4260) K, Y(4260)to J/psipi^+pi^-$$ decays. This study is based on a data sample corresponding to an integrated luminosity of 711 fb$$^{-1}$$, collected at the $$Upsilon(4S)$$ resonance with the Belle detector at the KEKB asymmetric-energy $$e^+ e^-$$ collider. We investigate the $$J/psipi^+pi^-$$ invariant mass distribution in the range 4.0 to 4.6 GeV/$$c^2$$ using both $$B^+ to J/psi pi^+pi^- K^+$$ and $$B^0 to J/psi pi^+pi^- K^0_S$$ decays. We find excesses of events above the background levels, with a significances of 2.1 and 0.9 standard deviations for charged and neutral $$B to Y(4260) K$$ decays, respectively, taking into account the systematic uncertainties. These correspond to upper limits on the product of branching fractions, $${cal B}(B^+ to Y(4260) K^+) times {cal B}(Y(4260) to J/psi pi^+ pi^-) < 1.4 times 10^{-5}$$ and $${cal B}(B^0 to Y(4260) K^0) times {cal B}(Y(4260) to J/psi pi^+ pi^-) < 1.7 times 10^{-5}$$ at the 90% confidence level.

論文

Measurement of $$B^0 to D^-_s K^0_s pi^+$$ and $$B^+ to D^-_s K^+ K^+$$ branching fractions

Wiechczynski, J.*; 谷田 聖; Belle Collaboration*; 他172名*

Physical Review D, 91(3), p.032008_1 - 032008_9, 2015/02

AA2015-0716.pdf:0.41MB

https://doi.org/10.1103/PhysRevD.91.032008
 被引用回数：6 パーセンタイル：26.51(Astronomy & Astrophysics)

We report a measurement of the $$B^0$$ and $$B^+$$ meson decays to the $$D^-_sK^0_Spi^+$$ and $$D^-_sK^+K^+$$ final states, respectively, using $$657times 10^6$$ $$Bbar{B}$$ pairs collected at the $$Upsilon(4S)$$ resonance with the Belle detector at the KEKB asymmetric-energy $$e^+e^-$$ collider. Using the $$D^-_s to phipi^-$$, $$K^*(892)^0K^-$$ and $$K^0_SK^-$$ decay modes for the $$D_s$$ reconstruction, we measure the following branching fractions: $${cal B}(B^0 to D^-_s K^0_S pi^+)=[0.47 pm 0.06({rm stat}) pm 0.05({rm syst})]times 10^{-4}$$ and $${cal B}(B^+ to D^-_s K^+ K^+)=[0.93 pm 0.22({rm stat}) pm 0.10({rm syst})]times 10^{-5}$$. We find the ratio of the branching fraction of $$B^+ to D^-_sK^+K^+$$ to that of the analogous Cabibbo-favored $$B^+ to D^-_sK^+pi^+$$ decay to be $${cal R_B}=0.054 pm 0.013({rm stat}) pm 0.006({rm syst})$$, which is consistent with the naive factorization model. We also observe a deviation of the $$D_sK$$ invariant-mass distribution from the three-body phase-space model for both studied decays.

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