Zobrazeno 1 - 10
of 59
pro vyhledávání: '"Whittingham, I. B."'
Publikováno v:
Phys. Rev. A 99, 062712 (2019)
Scattering and ionizing cross sections and rates are calculated for ultracold collisions between metastable helium atoms using a fully quantum-mechanical close-coupled formalism. Homonuclear collisions of the bosonic ${}^{4}$He$^{*} +{}^{4}$He$^{*}$
Externí odkaz:
http://arxiv.org/abs/1904.01281
We report results for the Lorentzian profiles of the Li I, Na I and K I doublets and the Na I subordinate doublet broadened by helium perturbers for temperatures up to 3000 K They have been obtained from a fully quantum-mechanical close-coupling desc
Externí odkaz:
http://arxiv.org/abs/physics/0609251
Publikováno v:
Phys.Rev. D71 (2005) 077301
We present fits to charmless strangeless hadronic B decay data for mean branching ratios and CP-violating asymmetries using the QCD factorization model of Beneke et al. Apart from one CP-violating parameter, the model gives a very good representation
Externí odkaz:
http://arxiv.org/abs/hep-ph/0501040
Collisions between tightly confined atoms can lead to ionization and hence to loss of atoms from the trap. We develop second-order perturbation theory for a tensorial perturbation of a spherically symmetric system and the theory is then applied to pr
Externí odkaz:
http://arxiv.org/abs/physics/0408125
Publikováno v:
Phys.Rev.D68:113005,2003
We present fits to charmless hadronic B decay data from the BaBar, Belle and Cleo experiments using two theoretical models: (i) the QCD factorization model of Beneke et al. and (ii) QCD factorization complemented with the so-called charming penguins
Externí odkaz:
http://arxiv.org/abs/hep-ph/0308269
Publikováno v:
ECONF C0304052:WG405,2003
In this paper we present fits to charmless hadronic B decay data from the BaBar, Belle and Cleo experiments using models by Beneke et. al. and Ciuchini et al. When we include the data from pseudo-scalar vector decays (PV) the current experimental res
Externí odkaz:
http://arxiv.org/abs/hep-ph/0305263
We predict the presence and positions of purely-long-range bound states of $^4$He$(2s ^3S)+{}^4$He$(2p ^3P)$ near the $2s ^3S_1+2p ^3P_{0,1}$ atomic limits. The results of the full multichannel and approximate models are compared, and we assess the s
Externí odkaz:
http://arxiv.org/abs/physics/0305023
Publikováno v:
J.Phys.G28:2843-2860,2002
Recent theoretical investigations of two-body hadronic B decays have provided justification for the use of the factorization ansatz to evaluate the B decay matrix elements. Motivated by this, we present simplified formulae for a wide range of B decay
Externí odkaz:
http://arxiv.org/abs/hep-ph/0102012
Publikováno v:
Phys. Rev. A 64, 042710 (2001)
We report scattering lengths for the singlet Sigma g +, triplet Sigma u + and quintet Sigma g + adiabatic molecular potentials relevant to collisions of two metastable (n=2 triplet S) helium atoms as a function of the uncertainty in these potentials.
Externí odkaz:
http://arxiv.org/abs/physics/0011072
Publikováno v:
Phys.Rev. D60 (1999) 114029
Two aspects of hadronic B decays are investigated. Firstly, the supersymmetric enhancement of hadronic b decays by gluino penguin processes is studied through their effect on the Wilson coefficients of the effective Hamiltonian. Secondly, hadronizati
Externí odkaz:
http://arxiv.org/abs/hep-ph/9905300