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We performed a measurement of the inclusive missing-mass spectrum of the $^{12}$C$(K^-, K^+)$ reaction at an incident beam momentum of 1.8 GeV/c. This measurement was carried out by using the Superconducting Kaon Spectrometer (SKS) and the K1.8 beamline spectrometer at the Hadron Experimental Facility in J-PARC. From the missing-mass of the $^{12}$C$(K^-, K^+)$ reaction, the binding energy of a $\\Xi ^-$ hyperon in a core $^{11}$B nucleus, $B_{\\Xi ^-}$, can be calculated. Our experimental setup yielded a good energy resolution of 8.2 MeV (full width at half maximum), which allowed us to observe significant enhancements in the proximity of the $^{12}_{\\Xi }$Be production threshold region. In order to extract information from the missing-mass spectrum, we employed several fitting parameters assumptions. A good agreement with the spectrum shape was obtained by adding two Gaussian functions, with the constant experimental resolution for the $\\Xi$-hypernuclear states, to the background distribution. The peak positions were obtained to be $B_{\\Xi ^-} = 8.9 \\pm 1.4$ (stat.) $^{+3.8}_{-3.1}$ (syst.) MeV and $B_{\\Xi ^-} = -2.4 \\pm 1.3$ (stat.) $^{+2.8}_{-1.2}$ (syst.) MeV. Another model assumption, one Breit–Wigner function with $B_{\\Xi ^-} = -2.7 \\pm 2.2$ (stat.) $^{+0.5}_{-0.7}$ (syst.) MeV and $\\Gamma = 4.1 \\pm 2.1$ (stat.) $^{+1.2}_{-0.7}$ (syst.) MeV, also yielded a similar $\\chi ^2$ value.

There are two available sets of data on the e+e−→Λc+Λ¯c− cross section at energies close to the production threshold, collected by the Belle and by the BESIII Collaborations. The measurement of the former, performed by means of the initial state radiation technique, is compatible with the presence of a resonance, called ψ(4660), observed also in other final states. On the contrary, the latter is measured an almost flat and hence non-resonant cross section in the energy region just above the production threshold, but the data stop before the possible rise in the cross section for the resonant production. We propose an effective model to describe the behavior of the data near this threshold, which is based on a Coulomb-like enhancement factor due to the strong interaction among the final state particles. In the framework of this model, it is possible to describe both datasets.

Abstract We have measured, for the first time, the inclusive missing-mass spectrum of the $^{12}$C$(K^-, p)$ reaction at an incident kaon momentum of 1.8 GeV/$c$ at the J-PARC K1.8 beamline. We observed a prominent quasi-elastic peak ($K^-p \\rightarrow K^-p$) in this spectrum. In the quasi-elastic peak region, the effect of secondary interaction is apparently observed as a peak shift, and the peak exhibits a tail in the bound region. We compared the spectrum with a theoretical calculation based on the Green’s function method by assuming different values of the parameters for the $\\bar{K}$–nucleus optical potential. We found that the spectrum shape in the binding-energy region $-300 \\, \\text{MeV} < B_{K} < 40$ MeV is best reproduced with the potential depths $V_0 = -80$ MeV (real part) and $W_0 = -40$ MeV (imaginary part). On the other hand, we observed a significant event excess in the deeply bound region around $B_{K} \\sim 100$ MeV, where the major decay channel of $K^- NN \\to \\pi\\Sigma N$ is energetically closed, and the non-mesonic decay modes ($K^- NN \\to \\Lambda N$ and $\\Sigma N$) should mainly contribute. The enhancement is fitted well by a Breit–Wigner function with a kaon-binding energy of 90 MeV and width 100 MeV. A possible interpretation is a deeply bound state of a $Y^{*}$-nucleus system.

This article sheds light on the role played by Francesco Guicciardini in the last six months of his tenure as Luogotenente generale, on behalf of Pope Clement VII. Focusing on the dramatic period from January to June 1527, this essay unveils a series of letters sent by Guicciardini to the Otto di Pratica, the executive magistrate of the Florentine Republic at this time. These letters were hitherto known only through the drafts kept in the Archivio Guicciardini, but not through the originals sent and received. The overall perspective shifts and reshapes the portrait of the Luogotenente as a man of action who makes bold decisions in order to protect his homeland, Florence, while unwittingly condemning Rome to the Sack.

This article publishes two hitherto unknown letters by the young Bernardino Telesio written in 1534-1535, a period of his biography which is virtually undocumented. The letters show the philosopher’s keen interest in medicine, applied to pope Clement VII’s final disease. Moreover, other contemporary letters written by an Orsini agent in Rome provide information about Telesio’s need for patronage in his early career.

We present the design and characterization of TIGER (Turin Integrated Gem Electronics for Readout), a 64-channel ASIC developed for the readout of the CGEM (Cylindrical Gas Electron Multiplier) detector, the proposed inner tracker for the 2018 upgrade of the BESIII experiment, carried out at BEPCII in Beijing. Each ASIC channel features a charge sensitive amplifier coupled to a dual-branch shaper stage, optimized for timing and charge measurement, followed by a mixed-mode back-end that extracts and digitizes the timestamp and charge of the input signals. The time-of-arrival is provided by a set of low-power TDCs, based on analogue interpolation techniques, while the charge measurement is obtained either from the Time-over-Threshold information or with a sample-and-hold circuit. The ASIC has been fabricated in a 110 nm CMOS technology and designed to operate with a 1.2 V power supply, an input capacitance of about 100 pF, an input dynamic range between 3 and 50 fC, a power consumption of about 12 mW/channel and a sustained event rate of 60 kHz/channel. The design and test results of TIGER first prototype are presented showing its full functionality.

In the K1.8 beam-line at Hadron Experimental Facility of J-PARC, a new magnetic spectrometer S-2S is being installed. S-2S was designed to achieve a high momentum resolution of Δ p / p = 6 × 10 −4 in FWHM. Several strangeness-physics programs which require the high resolution will be realized by S-2S. The present article introduces J-PARC E70 (missing-mass spectroscopy of Ξ 12 Be) and E94 (missing-mass spectroscopy of Λ 7 Li, Λ 10 B, and Λ 12 C) experiments.

There are two available sets of data on the e+e−→ Λ c+ Λ ¯ c− cross section at energies close to the production threshold, collected by the Belle and by the BESIII Collaborations. The measurement of the former, performed by means of the initial state radiation technique, is compatible with the presence of a resonance, called ψ(4660) , observed also in other final states. On the contrary, the latter is measured an almost flat and hence non-resonant cross section in the energy region just above the production threshold, but the data stop before the possible rise in the cross section for the resonant production. We propose an effective model to describe the behavior of the data near this threshold, which is based on a Coulomb-like enhancement factor due to the strong interaction among the final state particles. In the framework of this model, it is possible to describe both datasets.