Exploring charm decays with missing energy in leptoquark models

Faisel, Gaber; Su, J.; Tandean, Jusak

doi:10.1007/jhep04(2021)246

Cited by 16 publications

(9 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For instance, B(Λ c → pνν) > 1.8 • 10 −6 implies lepton universality violation, R Λc p = 1, and B(Λ c → pνν) > 1.1 • 10 −5 implies non-vanishing signals in LFV modes. Upper limits on branching ratios in specific leptoquark models are given in [43].…”

Section: Jhep09(2021)208mentioning

confidence: 99%

Probing for new physics with rare charm baryon (Λc, Ξc, Ωc) decays

Golz

Hiller

Magorsch

2021

J. High Energ. Phys.

View full text Add to dashboard Cite

We analyze rare charm baryon decays within the standard model and beyond. We identify all null test observables in unpolarized Λc→ pℓ+ℓ−, ℓ = e, μ decays, and study the new physics sensitivities. We find that the longitudinal dilepton polarization fraction FL is sensitive to electromagnetic dipole couplings $$ {C}_7^{\left(\prime \right)} $$ C 7 ′ , and to the right-handed 4-fermion vector coupling $$ {C}_9^{\left(\prime \right)} $$ C 9 ′ . The forward-backward asymmetry, AFB, due to the GIM-suppression a standard model null test already, probes the left-handed axialvector 4-fermion coupling C10; its CP–asymmetry, $$ {A}_{\mathrm{FB}}^{\mathrm{CP}} $$ A FB CP probes CP-violating phases in C10. Physics beyond the standard model can induce branching ratios of dineutrino modes Λc→ pν$$ \overline{\nu} $$ ν ¯ up to a few times 10−5, and one order of magnitude smaller if lepton flavor universality is assumed, while standard model rates are negligible. Charged lepton flavor violation allows for striking signals into e±μ∓ final states, up to 10−6 branching ratios model-independently, and up to order 10−8 in leptoquark models. Related three-body baryon decays Ξc→ Σℓℓ, Ξc→ Λℓℓ and Ωc→ Ξℓℓ offer similar opportunities to test the standard model with |∆c| = |∆u| = 1 transitions.

show abstract

Section: Jhep09(2021)208mentioning

confidence: 99%

Probing for new physics with rare charm baryon (Λc, Ξc, Ωc) decays

Golz

Hiller

Magorsch

2021

J. High Energ. Phys.

View full text Add to dashboard Cite

show abstract

“…We point out three new, clean null tests of the SM, K 2c , K 3s and K 4s (7). Just like the leptonic forward-backward asymmetry A FB ∝ K 1c (11), their SM contribution can be safely neglected because the GIM-mechanism switches off axial-vector couplings of the leptons, a feature previously exploited also for the D → ππ + − angular distribution [6]. We also find that the hadronic forward-backward asymmetry A H FB (14), although not a null test, can cleanly signal BSM physics in right-handed currents, C 7,9,10 , illustrated in Fig.…”

Section: Discussionmentioning

confidence: 82%

“…2 A Secondly, a scenario with C 10 = C 10 leads to a partial cancellation of contributions leading to a decreased signal with respect to C 10 = −C 10 scenarios. We also show A FB (11) in Fig. 2 (right plot) for C 10 = 0.3.…”

Section: B a H Fb And A Fbmentioning

confidence: 91%

See 1 more Smart Citation

Pinning down $|Δc|=|Δu|=1$ couplings with rare charm baryon decays

Golz,

Hiller,

Magorsch

2022

Preprint

View full text Add to dashboard Cite

We study the full angular distribution of semileptonic rare charm baryon decays in which the secondary baryon undergoes weak decay with sizable polarization parameter,analyzing decay chains allow for seven additional observables compared to three-body decays such as Λ c → p + − , with different sensitivities to the |∆c| = |∆u| = 1 weak couplings. Opportunities to test the standard model in c → u transitions with standard model null testsand other angular observables are worked out. We show that a joint model-independent analysis of the leptonic A FB , hadronic A H FB , and combined forward-backward asymmetry A H FB together with the fraction of longitudinally produced leptons, F L , is able to pin down the dipole couplings C 7 , C 7 and the semileptonic (axial-) vector ones C 10 , C 9 , C 10 . A H FB is also accessible with dineutrino c → uν ν modes and probes right-handed currents.

show abstract

“…The experimental and theoretical status of rare charm decays is presented in Ref. [5] and increasing and ongoing research interest [1,2,[5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23] manifests the importance of progress in the field.…”

Section: Introductionmentioning

confidence: 99%

Null test searches for BSM physics with rare charm decays

Golz¹

2021

Proceedings of 10th International Workshop on Charm Physics — PoS(CHARM2020)

View full text Add to dashboard Cite

Semileptonic Flavor Changing Neutral Current decays of charmed hadrons uniquely probe the up-sector of the Standard Model. Clean null test observables, such as CP-asymmetries, leptonuniversality ratios, missing energy modes, lepton flavor violating modes and angular observables can be studied in a variety of charmed meson and baryon modes. An overview of null test opportunities with rare charm decays is presented and similarities and complementarities of different modes are worked out.

show abstract

Exploring charm decays with missing energy in leptoquark models

Cited by 16 publications

References 39 publications

Probing for new physics with rare charm baryon (Λc, Ξc, Ωc) decays

Probing for new physics with rare charm baryon (Λc, Ξc, Ωc) decays

Pinning down $|Δc|=|Δu|=1$ couplings with rare charm baryon decays

Null test searches for BSM physics with rare charm decays

Contact Info

Product

Resources

About