263 research outputs found
Exotic dibaryons with a heavy antiquark
We discuss the possible existence of exotic dibaryons with a heavy antiquark,
being realized three-body systems, Dbar^(*)NN and B^(*)NN. These are genuinely
exotic states with no quark-antiquark annihilation. We consider the heavy quark
spin and chiral symmetries, and introduce the one pion exchange potential
between a Dbar^(*) (B^(*)) meson and a nucleon N. As for the NN interaction, we
employ the Argonne v^\prime_8 potential. By solving the coupled-channel
equations for PNN and P^* NN (P^(*)=Dbar^(*) and B^(*)), we find bound states
for (I,J^P)=(1/2,0^-) as well as resonant states for (I,J^P)=(1/2,1^-) both in
Dbar^(*)NN and B^(*)NN systems. We also discuss the heavy quark limit, and find
that the spin degeneracy is realized in the bound states with (I,J^P)=(1/2,0^-)
and (1/2,1^-).Comment: 4 pages, 1 figur
Exotic baryons from a heavy meson and a nucleon - Positive parity states -
We study heavy baryons with exotic flavor quantum numbers formed by a heavy
meson and a nucleon (DbarN and BN) with positive parity. One pion exchange
interaction, providing a tensor force, dominates as a long range force to bind
the DbarN and BN ystems. In the heavy quark mass limit, pseudoscalar meson and
vector meson are degenerate and the binding mechanism by the tensor force
analogous to that in the nuclear systems becomes important. As a result, we
obtain the DbarN and BN resonant states in the J^P=1/2^+, 3/2^+ and 5/2^+
channels with I=0
Chromosome-scale genome assembly of a Japanese chili pepper landrace, Capsicum annuum ‘Takanotsume’
日本を代表するトウガラシ「鷹の爪」の全ゲノムを解読 --多様なトウガラシを生み出すための基盤に--. 京都大学プレスリリース. 2023-01-12.Here, we report the genome sequence of a popular Japanese chili pepper landrace, Capsicum annuum ‘Takanotsume’. We used long-read sequencing and optical mapping, together with the genetic mapping technique, to obtain the chromosome-scale genome assembly of ‘Takanotsume’. The assembly consists of 12 pseudomolecules, which corresponds to the basic chromosome number of C. annuum, and is 3, 058.5 Mb in size, spanning 97.0% of the estimated genome size. A total of 34, 324 high-confidence genes were predicted in the genome, and 83.4% of the genome assembly was occupied by repetitive sequences. Comparative genomics of linked-read sequencing-derived de novo genome assemblies of two Capsicum chinense lines and whole-genome resequencing analysis of Capsicum species revealed not only nucleotide sequence variations but also genome structure variations (i.e., chromosomal rearrangements and transposon-insertion polymorphisms) between ‘Takanotsume’ and its relatives. Overall, the genome sequence data generated in this study will accelerate the pan-genomics and breeding of Capsicum, and facilitate the dissection of genetic mechanisms underlying the agronomically important traits of ‘Takanotsume’
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