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論文

Sequential nature of ($$p,3p$$) two-proton knockout from neutron-rich nuclei

Frotscher, A.*; G$'o$mez-Ramos, M.*; Obertelli, A.*; Doornenbal, P.*; Authelet, G.*; 馬場 秀忠*; Orlandi, R.; 他86名*

Physical Review Letters, 125(1), p.012501_1 - 012501_7, 2020/07

Twenty-one two-proton ($$p,3p$$) knock-out cross sections of neutron-rich radioactive isotopes were measured in inverse kinematics using the MINOS time-projection chamber at RIBF, RIKEN. The proton angular distributions, measured for the first time, reveal that the reaction kinematics of the ($$p,3p$$) reaction is consistent with sequential proton collisions within the projectile nucleus.

論文

Measurement of branching fraction and final-state asymmetry for the $$bar{B}^{0}to K^{0}_{S}K^{mp}pi^{pm}$$ decay

Lai, Y.-T.*; 谷田 聖; Belle Collaboration*; 他186名*

Physical Review D, 100(1), p.011101_1 - 011101_9, 2019/07

 被引用回数:0 パーセンタイル:100(Astronomy & Astrophysics)

We report a measurement of the branching fraction and final-state asymmetry for the $$bar{B}^{0}to K^{0}_{S}K^{mp}pi^{pm}$$ decays. The analysis is based on a data sample of 711 $$rm{fb}^{-1}$$ collected at the $$Upsilon(4S)$$ resonance with the Belle detector at the KEKB asymmetric-energy $$e^{+}e^{-}$$ collider. We obtain a branching fraction of $$(3.60pm0.33pm0.15)times10^{-6}$$ and a final-state asymmetry of $$(-8.5pm8.9pm0.2)%$$, where the first uncertainties are statistical and the second are systematic. Hints of peaking structures are seen in the differential branching fractions measured as functions of Dalitz variables.

論文

Transverse momentum dependent production cross sections of charged pions, kaons and protons produced in inclusive $$e^+e^-$$ annihilation at $$sqrt{s}=$$ 10.58 GeV

Seidl, R.*; 谷田 聖; Belle Collaboration*; 他186名*

Physical Review D, 99(11), p.112006_1 - 112006_15, 2019/06

 被引用回数:5 パーセンタイル:31.71(Astronomy & Astrophysics)

We report measurements of the production cross sections of charged pions, kaons, and protons as a function of fractional energy, the event-shape variable called thrust, and the transverse momentum with respect to the thrust axis. These measurements access the transverse momenta created in the fragmentation process, which are of critical importance to the understanding of any transverse momentum dependent distribution and fragmentation functions. The low transverse momentum part of the cross sections can be well described by Gaussians in transverse momentum as is generally assumed but the fractional-energy dependence is non-trivial and different hadron types have varying Gaussian widths. The width of these Gaussians decreases with thrust and shows an initially rising, then decreasing fractional-energy dependence. The widths for pions and kaons are comparable within uncertainties, while those for protons are significantly narrower. These single-hadron cross sections and Gaussian widths are obtained from a $$558,{rm fb}^{-1}$$ data sample collected at the $$Upsilon(4S)$$ resonance with the Belle detector at the KEKB asymmetric-energy $$e^+ e^-$$ collider.

論文

Single-spin asymmetry of $$J/psi$$ production in $$p$$$$+$$$$p$$, $$p$$$$+$$Al, and $$p$$$$+$$Au collisions with transversely polarized proton beams at $$sqrt{s_{_{NN}}}=200$$ GeV

Aidala, C.*; 長谷川 勝一; 今井 憲一; 佐甲 博之; 佐藤 進; 谷田 聖; PHENIX Collaboration*; 他286名*

Physical Review D, 98(1), p.012006_1 - 012006_11, 2018/07

 被引用回数:3 パーセンタイル:62.44(Astronomy & Astrophysics)

We report the transverse single-spin asymmetries of $$J/psi$$ production at forward and backward rapidity, $$1.2<|y|<2.2$$, as a function of $$J/psi$$ transverse momentum ($$p_T$$) and Feynman-$$x$$ ($$x_F$$). The data analyzed were recorded by the PHENIX experiment at the Relativistic Heavy Ion Collider in 2015 from $$p$$$$+$$$$p$$, $$p$$$$+$$Al, and $$p$$$$+$$Au collisions with transversely polarized proton beams at $$sqrt{s_{_{NN}}}=200$$ GeV. At this collision energy, single-spin asymmetries for heavy-flavor particle production of $$p$$$$+$$$$p$$ collisions provide access to the spin-dependent gluon distribution and higher-twist correlation functions inside the nucleon, such as the gluon Qiu-Sterman and trigluon correlation functions. Proton + nucleus collisions offer an excellent opportunity to study nuclear effects on the correlation functions. The data indicate negative asymmetries at the two-standard-deviation level in the $$p$$$$+$$Au data for $$p_T<2$$ GeV/$$c$$ at both forward and backward rapidity, while in $$p$$$$+$$$$p$$ and $$p$$$$+$$Al collisions the asymmetries are consistent with zero within the range of experimental uncertainties.

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