nucl-th digest · Apr 6, 2017

Deuteron-like states composed of two doubly charmed baryons

We present a systematic investigation of the possible molecular states composed of a pair of doubly charmed baryons (

Ξ_{cc} Ξ_{cc}

) or one doubly charmed baryon and one doubly charmed antibaryon

(Ξ_{cc} Ξ ˉ_{cc})

within the framework of the one-boson-exchange-potential model. For the spin-triplet systems, we take into account the mixing between the

^{3} S_{1}

and

^{3} D_{1}

channels. For the baryon-baryon system

Ξ_{cc} Ξ_{cc}

with

(R, I) = (3 ˉ, 1/2)

and

(3 ˉ, 0)

, where

R

and

I

represent the group representation and the isospin of the system, respectively, there exist loosely bound molecular states. For the baryon-antibaryon system

Ξ_{cc} Ξ ˉ_{cc}

with

(R, I) = (8, 1)

(8, 1/2)

and

(8, 0)

, there also exist deuteron-like molecules. The

B_{cc} B ˉ_{cc}

molecular states may be produced at LHC. The proximity of their masses to the threshold of two doubly charmed baryons provides a clean clue to identify them.

↳ hep-phhep-exnucl-thPRD(2017)·43 citations

First-principle calculations of Dark Matter scattering off light nuclei

C. Körber🇩🇪 · A. Nogga🇩🇪 · J. de Vries🇳🇱

We study the scattering of Dark Matter particles off various light nuclei within the framework of chiral effective field theory. We focus on scalar interactions and include one- and two-nucleon scattering processes whose form and strength are dictated by chiral symmetry. The nuclear wave functions are calculated from chiral effective field theory interactions as well and we investigate the convergence pattern of the chiral expansion in the nuclear potential and the Dark Matter-nucleus currents. This allows us to provide a systematic uncertainty estimate of our calculations. We provide results for $^{2}$ H, $^{3}$ H, and $^{3}$ He nuclei which are theoretically interesting and the latter is a potential target for experiments. We show that two-nucleon currents can be systematically included but are generally smaller than predicted by power counting and suffer from significant theoretical uncertainties even in light nuclei. We demonstrate that accurate high-order wave functions are necessary in order to incorporate two-nucleon currents. We discuss scenarios in which one-nucleon contributions are suppressed such that higher-order currents become dominant.

↳ hep-phnucl-thPRC(2017)·59 citations

Thursday·April 6, 2017

Deuteron-like states composed of two doubly charmed baryons

First-principle calculations of Dark Matter scattering off light nuclei

Affiliations