The previously reported room-temperature crystal structure [Jaud Baldy, Negrel, Poite & Chanon (1993 ▶). Z. Kristallogr.204, 289-291] of the title compound, C(20)H(8)Cl(12), is monoclinic with Z' = 1, whereas the 90 K structure reported herein is triclinic with Z' = 2 and shows a 2% volume contraction. The crystallographically independent unit chosen consists of both enanti-omers (Λ and Δ) of t...

We study boundary quantum Knizhnik-Zamolodchikov equations associated with quantum affine symmetry Uq(ŝln). We consider the case where the deformation parameter q satisfies |q| = 1, and the difference parameter λ > 0. We give an integral representation of boundary quantum Knizhnik-Zamolodchikov equations. Our approach is based on the free field realizations of the vertex operators and the bound...

The effective intercept parameter of the two-pion Bose-Einstein Correlation function, λ * , is found to be sensitive to partial restoration of U A (1) symmetry in ultra-relativistic nuclear collisions. An increase in the yield of the η ′ meson, proposed earlier as a signal of partial U A (1) restoration, is shown to create a " hole " in the low p t region of λ *. A comparison with NA44 data [1]...

We analyse the impact of quantum gravity on the possible solutions to the strong CP problem which utilize the spontaneously broken discrete symmetries, such as parity and time reversal invariance. We find that the stability of the solution under Planck scale effects provides an upper limit on the scale Λ of relevant symmetry breaking. This result is model dependent and the bound is most restric...

The Skyrme force parameters can be uniquely determined by coarse graining the Nucleon-Nucleon (NN) interactions at a characteristic momentum scale. We show how exact Vlowk potentials to second order in momenta are saturated with physical NN scattering threshold parameters at Center of Mass (CM) cut-off scales of about Λ = 250 MeV for the S-waves and Λ = 100 MeV for the P-waves. The pattern of W...

Based on e+e− collision data corresponding to an integrated luminosity of 4.5 fb−1 collected at the center-of-mass energies between 4.600 and 4.699 GeV with BESIII detector BEPCII, absolute branching fraction inclusive decay Λ¯c−→n¯+X, where X refers any possible final state particles, is measured. The determined be B(Λ¯c−→n¯+X)=(32.4±0.7±1.5)%, first uncertainty statistical second systematic. ...

We derive a condition for a non-trivial solution of the Schwinger-Dyson equation to be accompanied by a Goldstone bound state. It implies that, for quenched planar QED, although chiral symmetry breaking occurs when there is a cutoff, the continuum limit fails to exist. 1 I. Introduction Dynamical chiral symmetry breaking 1 (DCSB) has been extremely useful in a wide variety of topics in physics,...

We present the recent investigation on the effect of the SU(3) symmetry breaking in the spin structure of the octet baryons. The spin structure of the nucleon has been a hot issue since the measurement of the first moment of the proton spin structure function g p 1 [1] by the European Muon Collaboration (EMC). The EMC result indicates that the strange quark is polarized in the opposite directio...

We check the u and d quark contributions to the spin content of the Λ by means of the q → Λ fragmentation and find that the u and d quarks of the Λ are likely positively polarized. The parton distributions in the Λ are given by a successful statistical model which can reproduce and correlate a vast body of polarized and unpolarized structure function and parton distribution data of the nucleon....