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Ablikim, M.; Ачасов, М. Н.; Ai, X.; Albayrak, O.; Albrecht, M.; Ambrose, D.; Amoroso, A.; An, F. F.; An, Q.; Bai, J. Z.; Ferroli, R. Baldini; Ban, Y.; Bennett, D. W.; Bennett, J. V.; Bertani, M.; Bettoni, D.; Bian, J. M.; Bianchi, F.; Boger, E.; Boyko, I. R.; Briere, R. A.; Cai, H.; Cai, Xinxia; Çakır, O.; Calcaterra, A.; Cao, G. F.; Çetin, S. A.; Chang, J. F.; Chelkov, G.; Chen, G.; Chen, H. S.; Chen, H. Y.; Chen, J. C.; Chen, M. L.; Chen, S. J.; Chen, X.; Chen, X. R.; Chen, Y. B.; Cheng, H. P.; Chu, X. K.; Cibinetto, G.; Dai, H. L.; Dai, J. P.; Dbeyssi, A.; Dedovich, D.; Deng, Z. Y.; Denig, A.; Denysenko, I.; Destefanis, M.; Mori, F. De; Ding, Y.; Dong, C.; Dong, J.; Dong, L. Y.; Dong, M. Y.; Dou, Z. L.; Du, S. X.; Duan, Pengfei; Fan, J. Z.; Fang, J.; Fang, S. S.; Fang, X.; Fang, Y.; Fava, L.; Fedorov, Oleg; Feldbauer, F.; Felici, G.; Feng, C. Q.; Fioravanti, E.; Fritsch, M.; Fu, C. D.; Gao, Q.; Gao, X. L.; Gao, X. Y.; Gao, Y. S.; Gao, Z.; Garzia, I.; Goetzen, K.; Gong, W. X.; Gradl, W.; Greco, M.; Gu, M. H.; Gu, Y. T.; Guan, Y. H.; Guo, A. Q.; Guo, L. B.; Guo, Y. P.; Guo, Y. P.; Haddadi, Z.; Hafner, A.; Han, S.; Hao, X. Q.; Harris, F. A.; He, K. L.; Held, T.; Heng, Y. K.; Hou, Z. L.; Chen, Hu; Hu, H. M.; Hu, J.; Hu, T.; Hu, Y.; Huang, G. M.; Huang, G. S.; Huang, J. S.; Huang, X. T.; Huang, Y.; Hussain, T.; Ji, Q.; Ji, X. B.; Ji, X. L.; Jiang, L. W.; Jiang, X. S.; Jiang, X. Y.; Jiao, J. B.; Jiao, Z.; Jin, D. P.; Jin, S.; Johansson, T.; Julin, A.; Kalantar‐Nayestanaki, N.; Kang, X. L.; Kang, X. S.; Kavatsyuk, M.; Ke, B. C.; Kiese, P.; Kliemt, R.; Kloss, B.; Kolcu, O. B.; Kopf, B.; Kornicer, M.; Kuehn, W.; Kupść, A.; Lange, J. S.; Lara, M.; Larin, P.; Leng, C.; Li, C.; Li, Cheng; Li, D. M.; Li, F.; Li, F. Y.; Li, G.; Li, H. B.; Li, J. C.; Li, Jin; Li, K.; Li, Lei; Li, P. R.; Li, T.; Li, W. D.; Li, W. G.; Li, X. L.; Li, X. M.; Li, X. N.; Li, X. Q.; Li, Z. B.; Liu, Han; Liang, Y. F.; Liang, Y. T.; Liao, G. R.; Lin, D. X.; Liu, B. J.; Liu, C. X.; Liu, D.; Liu, F. H.; Liu, Fang; Liu, Feng; Liu, H. B.; Liu, H. H.; Liu, H. M.; Liu, J.; Liu, J. B.; Liu, J. P.; Liu, J. Y.; Liu, K.; Liu, K. Y.; Liu, L. D.; Liu, P. L.; Liu, Q.; Liu, S. B.; Liu, X.; Liu, Y. B.; Liu, Z. A.; Liu, Zhiqing; Lou, X.; Lü, H. J.; Lu, J. G.; Lu, Y.; Lu, Y. P.; Luo, C. L.; Luo, M. X.; Luo, T.; Luo, X. L.; Lyu, X. R.; C., F.; L., H.; L., L.; M., Q.; Ma, Tao; N., X.; Y., X.; Maas, F. E.; Maggiora, M.; Mao, Y.; Mao, Z. P.; Marcello, S.; Messchendorp, J. G.; Min, J.; Mitchell, R. E.; Mo, X. H.; Mo, Y. J.; Morales, C. Morales; Muchnoi, N. Yu.; Muramatsu, H.; Nefedov, Y.; Nerling, F.; Nikolaev, I. B.; Ning, Z.; Nisar, S.; Niu, S. L.; Niu, X. Y.; Olsen, S. L.; Ouyang, Q.; Pacetti, S.; Pan, Y.; Patterí, P.; Pelizaeus, M.; Peng, H.; Peters, K.; Pettersson, J.; Ping, J. L.; Ping, R. G.; Poling, R.; Prasad, V.; Qi, H. R.; Qi, M.; Qian, S. J.; Qiao, C. F.; Liu, Qin; Qin, Ning; Qin, X. S.; Qin, Z. H.; Qiu, J. F.; Rashid, K. H.; Redmer, C. F.; Ripka, M.; Rong, G.; Rosner, Ch.; Ruan, X. D.; Santoro, V.; Sarantsev, A.; Savrié, M.; Schoenning, K.; Schumann, S.; Shan, W.; Shao, M.; Shen, C. P.; Shen, P. X.; Shen, X. Y.; Sheng, H. Y.; Song, W. M.; Song, X. Y.; Sosio, S.; Spataro, S.; Sun, G. X.; Sun, J. F.; Sun, S. S.; Sun, Y. J.; Sun, Y. Z.; Sun, Zhi‐Wei; Sun, Z. T.; Tang, C. J.; Tang, X.; Tapan, I.; Thorndike, E. H.; Tiemens, M.; Ullrich, M.; Uman, I.; Varner, G.; Wang, B.; Wang, B. L.; Wang, D.; Wang, K.; Wang, L. L.; Wang, L. S.; Wang, M.; Wang, P.; Wang, P. L.; Wang, Shenzhi; Wang, W.; Wang, W. P.; Wang, X. F.; Wang, Y. D.; Wang, Y. F.; Wang, Y. Q.; Wang, Z.; Wang, Z. G.; Wang, Z. H.; Wang, Z. Y.; Weber, T.; Wei, D. H.; Wei, J. B.; Weidenkaff, P.; Wen, S. P.; Wiedner, U.; Wolke, M.; Wu, L. H.; Wang, Zhi; Xia, L.; Xia, Y.; Xiao, D.; Xiao, H.; Xiao, Z. J.; Xie, Y.; Xiu, Q. L.; Xu, G. F.; Xu, L.; Xu, Q. J.; Xu, Q.; Xu, X. P.; Yan, L.; Yan, W. B.; Yan, Y. H.; Yang, H. J.; Yang, H. X.; Yang, L.; Yang, Yifan; Yang, Yifan; Ye, M.; Ye, M. H.; Yin, J. H.; Yu, B. X.; Yu, C. X.; Yu, J. S.; Yuan, C. Z.; Yuan, W. L.; Yuan, Y.; Yuncu, A.; Zafar, A. A.; Zallo, A.; Zeng, Y.; Zeng, Z.; Zhang, B. X.; Zhang, B. Y.; Zhang, C.; Zhang, C. C.; Zhang, D. H.; Zhang, H. H.; Zhang, H. Y.; Zhang, J. J.; Zhang, J. L.; Zhang, J. Q.; Zhang, J. W.; Zhang, J. Y.; Zhang, J. Z.; Zhang, K.; Zhang, L.; Zhang, X. Y.; Zhang, Y.; Zhang, Y. H.; Zhang, Y. N.; Zhang, Y. T.; Zhang, Yu; Zhang, Z. H.; Zhang, Z. P.; Zhang, Z. Y.; Zhao, Gang; Zhao, Jiawei; Zhao, J.; Zhao, J. Z.; Liu, Zhao; Zhao, Ling; Zhao, M. G.; Zhao, Q.; Zhao, S. J.; Zhao, T. C.; Zhao, Y. B.; Zhao, Z. G.; Zhemchugov, A.; Zheng, B.; Zheng, J. P.; Zheng, W. J.; Zheng, Y.; Zhong, B.; Li, Zhou; Zhou, X. K.; Zhou, Xingyu; Zhu, K.; Zhu, S. H.; Zhu, X.; Zhu, Y.; Zhu, Y. S.; Zhu, Z. A.; Zhuang, J.; Zotti, L.; Zou, B. S.; Zou, J. H.

doi:10.1103/physrevlett.115.221805

Cited by 80 publications

(42 citation statements)

References 35 publications

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“…Since then the precision of other Λ + c branching fractions has improved due to measurements based on threshold data performed by BESIII [531]. BESIII also reported the first measurement of the branching fraction for the semileptonic decay Λ + c → Λe + ν e [1272]. Here we present a global fit for branching fractions of Cabbibo-favored Λ + c decays, taking into account all relevant experimental measurements and their correlations.…”

Section: Argus [1266]mentioning

confidence: 99%

Averages of b-hadron, c-hadron, and $$\tau $$ τ -lepton properties as of summer 2016

et al. 2017

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This paper reports world averages of measurements of b-hadron, c-hadron, and τ -lepton properties obtained by the Heavy Flavour Averaging Group using results available before April 2021. In rare cases, significant results obtained several months later are also used. For the averaging, common input parameters used in the various analyses are adjusted (rescaled) to common values, and known correlations are taken into account. The averages include branching fractions, lifetimes, neutral meson mixing parameters, CP violation parameters, parameters of semileptonic decays, and Cabibbo-Kobayashi-Maskawa matrix elements. Selected world averages -continued from previous page. ∆Γ d /Γ d 0.001 ± 0.010 |q d /p d | 1.0010 ± 0.0008 ∆m s 17.765 ± 0.006 ps −1 ∆Γ s +0.084 ± 0.005 ps −1 |q s /p s | 1.0003 ± 0.0014 φ ccs s −0.049 ± 0.019 rad Unitarity-Triangle angle parameters sin2β ≡ sin2φ 1 0.699 ± 0.017 β ≡ φ 1 (22.2 ± 0.7) • −ηS φK 0 S 0.74 +0.11 −0.13 −ηS η K 0 0.63 ± 0.06 −ηS K 0 S K 0 S K 0 S 0.83 ± 0.17 φ s (φφ) −0.073 ± 0.115 ± 0.027 rad S B 0 s →K + K − , C B 0 s →K + K − (0.14 ± 0.03, 0.17 ± 0.03) −ηS J/ψ π 0 0.86 ± 0.14 −ηS D + D − 0.84 ± 0.12 −ηS J/ψ ρ 0 0.66 +0.13 −0.12 +0.09 −0.03(0.343 ± 0.002)% τ parameters, lepton universality, and |V us | g τ /g µ 1.0009 ± 0.0014 g τ /g e 1.0027 ± 0.0014 g µ /g e 1.0019 ± 0.0014* )0 s B ( * )0 s ) = (87.0 ± 1.7)% [34] measured as described in Ref. [35]. The proportions of the various production channels for non-strange B mesons have also been measured [22]. 4.3 b-hadron production fractions at high energy At high energy, all species of weakly decaying b hadrons may be produced, either directly or in strong and electromagnetic decays of excited b hadrons. Before 2010, it was assumed that the fractions of different species in unbiased samples of high-p T b-hadron jets where independent of whether they originated from Z decays, pp collisions at the Tevatron, or pp collisions at the LHC. This hypothesis was plausible under the condition Q 2 Λ 2 QCD , namely, that the square of the momentum transfer to the produced b quarks is large compared with the square of the hadronization energy scale. This hypothesis is correct in the limit p T → ∞, in which the production mechanism of a b hadron is completely described by the fragmentation of the b quark. For finite p T , however, there are interference effects of the production mechanism of the b quark and its hadronization. While formally suppressed by inverse powers of p T , these effects may be sizable, especially when the fragmentation probabilities are small as, e.g., in the case of b baryons. In fact, the available data show that the fractions depend on the kinematics of the produced b hadron. Both CDF and LHCb reported a p T dependence of the fractions, with the fraction of Λ 0 b baryons observed at low p T being enhanced with respect to that seen at LEP at higher p T . In our previous publication [1], we presented two sets of averages, one including only measurements performed at LEP, and another including only measurements performed ...

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Section: Argus [1266]mentioning

confidence: 99%

Averages of b-hadron, c-hadron, and $$\tau $$ τ -lepton properties as of summer 2016

et al. 2017

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“…The most precise measurements of the Λ c → Λ + ν branching fractions (decay rates times the Λ c lifetime) to date have recently been reported by the BESIII Collaboration [11,12],…”

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Λc→Λl+νl Form Factors and Decay Rates from Lattice QCD with Physical Quark Masses

Meinel

2017

Phys. Rev. Lett.

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The first lattice QCD calculation of the form factors governing Λc → Λ + ν decays is reported. The calculation was performed with two different lattice spacings and includes one ensemble with a pion mass of 139(2) MeV. The resulting predictions for the Λc → Λe + νe and Λc → Λµ + νµ decay rates divided by |Vcs| 2 are 0.2007(71)(74) ps −1 and 0.1945(69)(72) ps −1 , respectively, where the two uncertainties are statistical and systematic. Taking the Cabibbo-Kobayashi-Maskawa matrix element |Vcs| from a global fit and the Λc lifetime from experiments, this translates to branching fractions of B(Λc → Λe + νe) = 0.0380(19)LQCD(11)τ Λc and B(Λc → Λµ + νµ) = 0.0369(19)LQCD(11)τ Λc . These results are consistent with, and two times more precise than, the measurements performed recently by the BESIII Collaboration. Using instead the measured branching fractions together with the lattice calculation to determine the CKM matrix element gives |Vcs| = 0.949(24)LQCD(14)τ Λc (49)B.Precision studies of processes in which heavy bottom or charm quarks decay to lighter quarks play an important role in testing the Standard Model of elementary particle physics. While most of these analyses are being performed using B and D mesons, decays of Λ b and Λ c baryons can provide valuable additional information. Two examples that shed new light on puzzles posed by mesonic decays are the determination of the ratio of CKM matrix elements, and an analysis of the. Both studies rely on nonperturbative lattice QCD calculations of form factors describing the baryonic matrix elements of the underlying quark currents [3,4].This letter focuses on the charmed-baryon decays Λ c → Λ + ν ( = e, µ), whose rates are proportional to |V cs | 2 in the Standard Model. Previous determinations of this CKM matrix element are(1)The motivations for studying Λ c → Λ + ν include the following:1. Taking the precisely determined value of |V cs | from CKM unitarity, a comparison between calculated and measured Λ c → Λ + ν decay rates provides a stringent test of the methods used to compute the heavy-baryon decay form factors.2. Combining the Λ c → Λ + ν decay rates from experiment with a lattice QCD calculation of the Λ c → Λ form factors gives a new direct determination of |V cs | and new constraints on physics beyond the Standard Model (see, e.g., Ref.[9] for a recent discussion of new physics in c → s + ν transitions).3. If the Λ c → Λ + ν decay rates are known precisely, from experiment or lattice QCD, these modes can be used as normalization modes in measurements of a wide range of other charm and bottom baryon decays [10].The most precise measurements of the Λ c → Λ + ν branching fractions (decay rates times the Λ c lifetime) to date have recently been reported by the BESIII Collaboration [11,12],In the Standard Model, the decay rates depend on six form factors that parametrize the matrix elements Λ(p )|sγ µ c|Λ c (p) and Λ(p )|sγ µ γ 5 c|Λ c (p) as functions of q 2 = (p−p ) 2 . These form factors have previously been estimated using quark models and sum rules [13]...

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“…Last year the BESIII Collaboration [4] reported the first absolute measurement of the branching fraction of the semileptonic Λ + c → Λe + ν e process which is considerably more precise than previous values [5]. The branching fraction was found to be Br(Λ + c → Λe + ν e ) = (3.63 ± 0.38 ± 0.20)% [4]. Later BESIII provided measurements for twelve Λ + c decay modes, including the branching fraction for Λ + c → pK − π + decay with the value (5.84±0.27±0.23)% [6].…”

mentioning

confidence: 99%

Semileptonic decays of $$\Lambda _c$$ Λ c baryons in the relativistic quark model

Фаустов

Galkin

2016

Eur. Phys. J. C

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Motivated by recent experimental progress in studying weak decays of the Λ c baryon we investigate its semileptonic decays in the framework of the relativistic quark model based on the quasipotential approach with the QCD-motivated potential. The form factors of the Λ c → Λlν l and Λ c → nlν l decays are calculated in the whole accessible kinematical region without extrapolations and additional model assumptions. Relativistic effects are systematically taken into account including transformations of baryon wave functions from the rest to moving reference frame and contributions of the intermediate negative-energy states. Baryon wave functions found in the previous mass spectrum calculations are used for the numerical evaluation. Comprehensive predictions for decay rates, asymmetries and polarization parameters are given. They agree well with available experimental data.Recently significant experimental progress has been achieved in studying weak decays of the charm baryons. Thus in 2014, Belle Collaboration [1] measured the branching fraction Br(Λ + c → pK − π + ) = (6.84 ± 0.24 +0.21 −0.27 )% with the larger value and precision improved by a factor of 5 over previous results [2]. This measurement is very important since many of the previously measured Λ c branching fractions are determined by their ratio with respect to Br(Λ + c → pK − π + ) [3]. It leads to the improved value of the semileptonic branching fraction Br(Λ + c → Λe + ν e ) = (2.9 ± 0.5)% [5]. Last year the BESIII Collaboration [4] reported the first absolute measurement of the branching fraction of the semileptonic Λ + c → Λe + ν e process which is considerably more precise than previous values [5]. The branching fraction was found to be Br(Λ + c → Λe + ν e ) = (3.63 ± 0.38 ± 0.20)% [4]. Later BESIII provided measurements for twelve Λ + c decay modes, including the branching fraction for Λ + c → pK − π + decay with the value (5.84±0.27±0.23)% [6]. The measurements of the branching fractions of the other Cabibbo-Kobayashi-Maskawa (CKM) favored [6] and singly suppressed [7] hadronic decay modes were significantly improved.Motivated by these experimental achievements we investigate semileptonic Λ c decays in the relativistic quark model based on the quasipotential approach with the QCD-motivated potential. The mass spectra of heavy and strange baryons calculated in the quark-diquark picture of baryons in our model [8] agree well with available experimental data. The proton and neutron masses are also well reproduced. The study of baryon spectroscopy allowed us to determine the baryon wave functions which we use here for the numerical calculations. Recently we considered the semileptonic Λ b decays [9]. General relativistic expressions for the decay form factors as overlap integrals of the initial and final baryon wave functions were found. They are obtained without application of either heavy quark 1/m Q or nonrelativistic v/c expansions. Relativistic effects, including wave function transformations from the rest

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Measurement of the Absolute Branching Fraction forΛc+→Λe+νe

Cited by 80 publications

References 35 publications

Averages of b-hadron, c-hadron, and $$\tau $$ τ -lepton properties as of summer 2016

Averages of b-hadron, c-hadron, and $$\tau $$ τ -lepton properties as of summer 2016

Λc→Λl+νl Form Factors and Decay Rates from Lattice QCD with Physical Quark Masses

Semileptonic decays of $$\Lambda _c$$ Λ c baryons in the relativistic quark model

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