118050037
MEGA : A Search for the rare decay mu —g e gamma at the level of 5 x 10**-13
123272214
New (e,e′K+) hypernuclear spectroscopy with a high resolution kaon spectrometer
Abstract A new ( e , e ′ K + ) hypernuclear spectroscopy is proposed at Jefferson Lab. With a newly designed high resolution kaon spectrometer (HKS) and a new experimental configuration to reduce background electrons associated with bremsstrahlung, it is expected to realize much higher yield and hypernuclear mass resolution than those of the first successful experiment at Jefferson Lab Hall-C, which demonstrated the feasibility of hypernuclear electroproduction for Λ hypernuclear spectroscopy.
123162199
RF Cherenkov picosecond timing technique for high energy physics applications
Abstract The Cherenkov time-of-propagation (TOP) detector and Cherenkov time-of-flight (TOF) detector in a “head-on” geometry based on the recently proposed time measuring technique with radio frequency (RF) phototube are considered. Results of the Monte Carlo simulations are presented.
122783059
Radio frequency picosecond phototube
Abstract We propose a photon detector for recording low-level and ultra-fast optical signals, based on radio frequency (RF) analysis of low-energy photoelectrons (PEs). By using currently developed 500 MHz RF deflector, it is possible to scan circularly and detect single PEs, amplified in multi-channel plates (MCPs). The operation of the tube is investigated by means of thermionic electron source. It is demonstrated that the signals generated in the MCP can be processed event by event; by using available nanosecond electronics and that time resolution better than 20 ps can be achieved. Timing characteristics of the Cherenkov detector with RF phototube in a ‘head-on’ geometry is investigated by means of Monte Carlo simulation.
122072860
Delayed Pion Spectroscopy of Hypernuclei
New possibilities of hypernuclear studies at modern electron accelerators based on recently developed radio frequency photomultiplier tubes are discussed.
125394021
gamma-ray spectroscopy of (Lambda)Be-9
19203912
Estimating the mass of the hidden charm $$1^+(1^{+})$$1+(1+) tetraquark state via QCD sum rules
By using QCD sum rules, the mass of the hidden charm tetraquark $$[cu][\bar{c}\bar{d}]$$[cu][c¯d¯] state with $$I^{G} (J^{P}) = 1^+ (1^{+})$$IG(JP)=1+(1+) (HCTV) is estimated, which presumably will turn out to be the newly observed charmonium-like resonance $$Z_c^+(3900)$$Zc+(3900). In the calculation, contributions up to dimension eight in the operator product expansion (OPE) are taken into account. We find $$m_{1^+}^c = (3912^{+306}_{-153}) \, \text {MeV}$$m1+c=(3912-153+306)MeV, which is consistent, within the errors, with the experimental observation of $$Z_c^+(3900)$$Zc+(3900). Extending to the b-quark sector, $$m_{1^+}^b = (10561^{+395{}^{}}_{-163}) \,\text {MeV}$$m1+b=(10561-163+395)MeV is obtained. The calculational result strongly supports the tetraquark picture for the “exotic” states of $$Z_c^+(3900)$$Zc+(3900) and $$Z_b^+(10610)$$Zb+(10610).
119227533
Molecular states with hidden charm and strange in QCD Sum Rules
This work uses the QCD Sum Rules to study the masses of the and molecular states with quantum numbers . Interpolating currents with definite C-parity are employed, and the contributions up to dimension eight in the Operator Product Expansion (OPE) are taken into account. The results indicate that two hidden strange charmonium-like states may exist in the energy ranges of and , respectively. The hidden strange charmonium-like states predicted in this work may be accessible in future experiments, e.g., BESIII, BelleII and SuperB. Possible decay modes, which may be useful in further research, are predicted.
119236104
Fermion correction to the mass of the scalar glueball in QCD sum rule
Contributions of fermions to the mass of the scalar glueball $0^{++}$ are calculated at two-loop level in the framework of QCD sum rules. It obviously changes the coefficients in the operator product expansion (OPE) and shifts the mass of glueball.