Mass splitting and production of Σc0 and Σc++ measured in 500 GeV π− -N interactions

Aitala, E. M.; Amato, S.; Anjos, J. C.; Appel, J. A.; Ashery, D.; Banerjee, S.; Bediaga, I.; Blaylock, G.; Bracker, Stephen B.; Burchat, P. R.; Burnstein, R. A.; Carter, Thomas; Carvalho, H. S.; Copty, N.; Costa, I.; Cremaldi, L.; Darling, C.; Denisenko, K.; Fernández, A.; Gagnon, P.; Gerzon, S.A.; Gounder, K.; Halling, A. M.; Herrera, G.; Hurvits, G.; James, C.; Kasper, P. A.; Kondakis, N.; Kwan, S.; Langs, D. C.; Leslie, J. R.; Lichtenstadt, J.; Lundberg, B.; Manacero, Aleardo; MayTal‐Beck, S.; Meadows, B.; Neto, J. R. T. de Mello; Milburn, R. H.; Miranda, J. M. De; Napier, A.; Nguyen, A.; D’Oliveira, A.; O’Shaughnessy, K.; Peng, K.C.; Perera, L. P.; Purohit, M.; Quinn, B.; Radeztsky, S.; Rafatian, A.; Reay, N. W.; Reidy, J.; Reis, A. C. dos; Rubin, H. A.; Santha, A.K.S.; Santoro, A. F. S.; Schwartz, A. J.; Sheaff, M.; Sidwell, R. A.; Slaughter, A. J.; Smith, J. G.; Sokoloff, M. D.; Stanton, N. R.; Sugano, K.; Summers, D. J.; Takach, S.; Thorne, K. A.; Tripathi, A.; Watanabe, Shuji; Weiss-Babai, R.; Wiener, J.; Witchey, N.; Wolin, E.; Duan, Yi; Zaliznyak, R.; Zhang, C.

doi:10.1016/0370-2693(96)00471-6

Cited by 16 publications

(7 citation statements)

References 36 publications

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“…where A 1.1 is extrapolated [64] from a measurement by the E791 collaboration [66] and ω 1 = 0.71 ± 0.13 is measured by the CLEO collaboration [67]. At the Z the polarization of the charmquark P (Z) c −0.65 [68] and one obtains a sizable polarization…”

Section: On λ C → Pγmentioning

confidence: 99%

Rare radiative charm decays within the standard model and beyond

Boer

Hiller

2017

J. High Energ. Phys.

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We present standard model (SM) estimates for exclusive c → uγ processes in heavy quark and hybrid frameworks. Measured branching ratios B(D 0 → (φ,K * 0 )γ) are at or somewhat exceeding the upper range of the SM and suggest slow convergence of the 1/m D , α s -expansion. Model-independent constraints on |∆C| = |∆U | = 1 dipole operators from B(D 0 → ρ 0 γ) data are obtained. Predictions and implications for leptoquark models are worked out. While branching ratios are SM-like CP asymmetries 10% can be induced. In SUSY deviations from the SM can be even larger with CP asymmetries of O(0.1). If Λ cbaryons are produced polarized, such as at the Z-pole, an angular asymmetry in Λ c → pγ decays can be studied that is sensitive to chirality-flipped contributions.

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Section: On λ C → Pγmentioning

confidence: 99%

Rare radiative charm decays within the standard model and beyond

Boer

Hiller

2017

J. High Energ. Phys.

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“…The properties of the Σ 0=þþ c baryons have been measured by many experiments [8][9][10][11][12][13][14], but the total uncertainties of the world averages remain large [15]. For example, the relative uncertainties of the decay widths are around 10% of their central values.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, the relative uncertainty of the mass splitting mðΣ c ð2455Þ þþ Þ − mðΣ c ð2455Þ 0 Þ is about 40%, and there is no significant measurement for the mass splitting mðΣ c ð2520Þ þþ Þ − mðΣ c ð2520Þ 0 Þ [12,16]. Due to the mass hierarchy between the d and u quarks, one may expect that the Σ 0 c ðddcÞ baryon is heavier than the Σ þþ c ðuucÞ baryon; however, many experimental results contradict this naive expectation [8,[11][12][13]. To explain the discrepancy, various models have been introduced [17][18][19][20][21][22][23] that predict positive mass splittings.…”

Section: Introductionmentioning

confidence: 99%

Measurements of the masses and widths of theΣc(2455)0/++
Lee¹,
Ko²,
Won³
et al. 2014
Phys. Rev. D
36
1
14
0
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We present measurements of the masses and decay widths of the baryonic states Σ c ð2455Þ 0=þþ and Σ c ð2520Þ 0=þþ using a data sample corresponding to an integrated luminosity of 711 fb −1 collected with the Belle detector at the KEKB e þ e − asymmetric-energy collider operating at the ϒð4SÞ resonance. We report the mass differences with respect to the Λ þ c baryon MðΣ c ð2455Þ 0 Þ − MðΛ þ c Þ ¼ 167.29 AE 0.01 AE 0.02 MeV=c 2 ; MðΣ c ð2455Þ þþ Þ − MðΛ þ c Þ ¼ 167.51 AE 0.01 AE 0.02 MeV=c 2 ; MðΣ c ð2520Þ 0 Þ − MðΛ þ c Þ ¼ 231.98 AE 0.11 AE 0.04 MeV=c 2 ; MðΣ c ð2520Þ þþ Þ − MðΛ þ c Þ ¼ 231.99 AE 0.10 AE 0.02 MeV=c 2 ; and the decay widths ΓðΣ c ð2455Þ 0 Þ ¼ 1.76 AE 0.04 þ0.09 −0.21 MeV=c 2 ; ΓðΣ c ð2455Þ þþ Þ ¼ 1.84 AE 0.04 þ0.07 −0.20 MeV=c 2 ; ΓðΣ c ð2520Þ 0 Þ ¼ 15.41 AE 0.41 þ0.20 −0.32 MeV=c 2 ; ΓðΣ c ð2520Þ þþ Þ ¼ 14.77 AE 0.25 þ0.18 −0.30 MeV=c 2 ; S.-H. LEE et al. PHYSICAL REVIEW D 89, 091102(R) (2014) 091102-2 RAPID COMMUNICATIONS where the first uncertainties are statistical and the second are systematic. The isospin mass splittings are measured to be MðΣ c ð2455Þ þþ Þ − MðΣ c ð2455Þ 0 Þ ¼ 0.22 AE 0.01 AE 0.01 MeV=c 2 and MðΣ c ð2520Þ þþ Þ− MðΣ c ð2520Þ 0 Þ ¼ 0.01 AE 0.15 AE 0.03 MeV=c 2. These results are the most precise to date.

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“…However, this result is in some tension with what was obtained for the analogous b-quark system by the DELPHI experiment at LEP, w 1 = −0.36±0.30±0.30 [42][43][44], and with the phenomenological model of [21] which predicts w 1 ≈ 0.39. The value of A can be estimated [13] from the relative Σ c /Λ c yield reported by the E791 experiment [45] to be 3 A = 1.1 ± 0.4 .…”

Section: Overview Of the Theoretical Picturementioning

confidence: 99%

Measuring c-quark polarization in W +c samples at ATLAS and CMS

Kats

2016

J. High Energ. Phys.

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Being able to measure the polarization of quarks produced in various processes at the LHC would be of fundamental significance. Measuring the polarizations of quarks produced in new physics processes, once discovered, can provide crucial information about the new physics Lagrangian. In a series of recent papers, we have investigated how quark polarization measurements can be done in practice. The polarizations of heavy quarks (b and c) are expected to be largely preserved in the lightest baryons they hadronize into, the Λ b and Λ c , respectively. Furthermore, it is known experimentally that s-quark polarization is preserved as well, in Λ baryons. We study how ATLAS and CMS can measure polarizations of b, c and s quarks using certain decays of these baryons. We propose to use the Standard Model tt and W c samples to calibrate these measurements. We estimate that the Run 2 dataset will suffice for measuring the quark polarizations in these Standard Model samples with precisions of order 10%. We also propose various additional measurements for the near and far future that would help characterize the polarization transfer from the quarks to the baryons.

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Mass splitting and production of Σc0 and Σc++ measured in 500 GeV π− -N interactions

Cited by 16 publications

References 36 publications

Rare radiative charm decays within the standard model and beyond

Rare radiative charm decays within the standard model and beyond

Measurements of the masses and widths of theΣc(2455)0/++
Lee¹,
Ko²,
Won³
et al. 2014
Phys. Rev. D
36
1
14
0
View full text Add to dashboard Cite

Measuring c-quark polarization in W +c samples at ATLAS and CMS

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Mass splitting and production of Σc0 and Σc++ measured in 500 GeV π− -N interactions

Cited by 16 publications

References 36 publications

Rare radiative charm decays within the standard model and beyond

Rare radiative charm decays within the standard model and beyond

Measurements of the masses and widths of theΣc(2455)0/++Lee1, Ko2, Won3 et al. 2014Phys. Rev. D361140View full textAdd to dashboardCite

Measuring c-quark polarization in W +c samples at ATLAS and CMS

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Product

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Measurements of the masses and widths of theΣc(2455)0/++
Lee¹,
Ko²,
Won³
et al. 2014
Phys. Rev. D
36
1
14
0
View full text Add to dashboard Cite