Precision Measurements of theΛc+andD0

Abstract

We report new precision measurements of the lifetimes of the L

Magnetic moments of bottom baryons: Effective mass and screened charge

“…(3) In light cone QCD sum rules [32,33], available predictions, i.e., Ä À b ¼ Àð0:08 AE 0:02Þ n:m., Ä 0 b ¼ Àð0:045 AE 0:005Þ n:m. are consistent with our results, however, it predicts a larger magnetic moment value for à 0 b ¼ Àð0:18 AE 0:05Þ n:m Comparing our results with a recent calculation based on hypercentral approach by [42], we find that their results are on the larger side even when compared to a similar approach [38]. (4) In the doubly heavy baryon sector, numerical values of magnetic moments of Ä 0 bb , Ä À bb , À bb , and à 0 b are consistent with all the other approaches except for the bag model [39] and relativistic three quark model [36] predictions which are smaller than our results. (5) Comparison of magnetic moments of doubly heavy Ä þ cb , Ä 0þ cb , Ä 0 cb , Ä 00 cb , and 0 cb , 00 cb states in different approaches show disagreements.…”

“…Magnetic moments of J P ¼ 1 2 þ baryons Presently, no experimental values of magnetic moments are available for the heavy baryon (charm and bottom) sector. One may expect them to be measured experimentally in the near future, as many interesting experimental results have been put forward recently [1][2][3][4][5][6][7]. Theoretically, bottom baryon magnetic moments have been calculated using various approaches listed in columns 4-9 of Table III.…”

“…All spatial-ground-state baryons carrying single charm quark have already been observed, and their masses have also been measured. Many spin-1 2 b-baryons à b , AE b , Ä b , and b and spin- 3 2 baryon AE à b have also been discovered [1][2][3][4][5]. Recently, SELEX collaboration announced the doubly heavy spin- 1 2 baryon state Ä þ cc with two charm quarks [3].…”

Signals of the double intrinsic heavy quark at the current experiments

“…67% of the events were induced by Σ − , 13% by π − , and 18% by protons. In the first observation using the sample of Λ + c → pK − π + [8,9], a signal of 15.9 events over 6.1 ± 0.1 background events of Ξ + cc → Λ + c K − π + was found [10]. To complement this result, SELEX published an observation of 5.62 signal events over 1.38 ± 0.13 background events for the decay mode Ξ + cc → pDK − from a sample of D + → K − π + π + decays [11].…”

Resolving the SELEX–LHCb double-charm baryon conflict: the impact of intrinsic heavy-quark hadroproduction and supersymmetric light-front holographic QCD

“…The positive beam contained 90% protons. In a first observation using the sample of Λ + c → pK − π + [4,5], SELEX found a signal of 15.9 events over 6.1 ± 0.1 background events in the channel Ξ + cc → Λ + c K − π + [1]. To complement this result, SELEX published an observation of 5.62 signal events over 1.38 ± 0.13 background events for the decay mode Ξ + cc → pDK − from a sample of D + → K − π + π + decays [3].…”