Towards the (Mexican) discovery of 2nd class currents @ Belle-II - - PowerPoint PPT Presentation

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Towards the (Mexican) discovery of 2nd class currents @ Belle-II - - PowerPoint PPT Presentation

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XV MEXICAN WORKSHOP ON PARTICLES AND FIELDS Mazatln (Sinaloa) 2-6 November 2015 Towards the (Mexican) discovery of 2nd class currents @ Belle-II Pablo Roig Dpto. de Fsica Cinvestav-IPN Mxico DF Collaboration with R. Escribano and S.

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Towards the (Mexican) discovery

  • f 2nd class currents

@ Belle-II

Pablo Roig

  • Dpto. de Física Cinvestav-IPN

México DF

Collaboration with R. Escribano and S. González-Solís (IFAE & UAB, Barcelona), to appear soon

XV MEXICAN WORKSHOP ON PARTICLES AND FIELDS Mazatlán (Sinaloa) 2-6 November 2015

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CONTENTS

Towards the discovery of 2nd class currents @ Belle-II Pablo Roig

Relation between pp,ph,ph’ VFFs Relation between KK,ph,ph’ SFFs CONCLUSIONS

MOTIVATION

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Towards the discovery of 2nd class currents @ Belle-II Pablo Roig

MOTIVATION

Non-strange V-A currents can be split into 1st class currents: 2nd class current: Irrespective of the underlying resonance mechanism SCC

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Towards the discovery of 2nd class currents @ Belle-II Pablo Roig

MOTIVATION

Non-strange V-A currents can be split into 1st class currents: 2nd class current: Irrespective of the underlying resonance mechanism Note: There are/have been several attempts to discover SCC in nuclear processes, but they mostly rely on CVC (and SCC should be effects of the order of isospin breaking corrections to CVC) and have large uncertainties. SCC RevModPhys.78.991

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Towards the discovery of 2nd class currents @ Belle-II Pablo Roig

MOTIVATION

Irrespective of the underlying resonance mechanism SCC These decay modes should have already been discovered if it was not for the strong bkg

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Towards the discovery of 2nd class currents @ Belle-II Pablo Roig

MOTIVATION

Irrespective of the underlying resonance mechanism SCC These decay modes should have already been discovered if it was not for the strong bkg τ−→ηπ−π0ντ Dumm & Roig Phys.Rev. D86 (2012) 076009

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Towards the discovery of 2nd class currents @ Belle-II Pablo Roig

MOTIVATION

SCC Irrespective of the underlying resonance mechanism The considered processes could provide complementary information to h3p

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Towards the discovery of 2nd class currents @ Belle-II Pablo Roig

MOTIVATION

SCC Irrespective of the underlying resonance mechanism The considered processes could provide complementary information to h3p The corresponding suppression of the SM contribution can make NP visible

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Towards the discovery of 2nd class currents @ Belle-II Pablo Roig

MOTIVATION

Enhancement of the dominating SFF: From Btnt Improvable if we know the SFF with < 20% accuracy

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Towards the discovery of 2nd class currents @ Belle-II Pablo Roig

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Towards the discovery of 2nd class currents @ Belle-II Pablo Roig Following Gasser & Leutwyler:

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Towards the discovery of 2nd class currents @ Belle-II Pablo Roig Following Gasser & Leutwyler: Another FF (F0) is employed instead of F- in order to have both FFs in correspondence with S- (F0) and P-wave (F+).

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Towards the discovery of 2nd class currents @ Belle-II Pablo Roig Following Gasser & Leutwyler: Another FF (F0) is employed instead of F- in order to have both FFs in correspondence with S- (F0) and P-wave (F+). ∂m

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Towards the discovery of 2nd class currents @ Belle-II Pablo Roig Following Gasser & Leutwyler: Another FF (F0) is employed instead of F- in order to have both FFs in correspondence with S- (F0) and P-wave (F+). ∂m ∂m

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Towards the discovery of 2nd class currents @ Belle-II Pablo Roig

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Towards the discovery of 2nd class currents @ Belle-II Pablo Roig

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Towards the discovery of 2nd class currents @ Belle-II Pablo Roig

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Towards the discovery of 2nd class currents @ Belle-II Pablo Roig All dynamics is encoded in the normalized FFs (Erler)

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Towards the discovery of 2nd class currents @ Belle-II Pablo Roig All dynamics is encoded in the normalized FFs (Erler) Isospin-violating quantity explaining the overall suppression of these decays

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Relation between pp,ph,ph’ VFFs

Towards the discovery of 2nd class currents @ Belle-II Pablo Roig

cPT in the large-NC limit: simultaneous expansion in p2, m2 and 1/NC

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Relation between pp,ph,ph’ VFFs

Towards the discovery of 2nd class currents @ Belle-II Pablo Roig

cPT in the large-NC limit: simultaneous expansion in p2, m2 and 1/NC

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Relation between pp,ph,ph’ VFFs

Towards the discovery of 2nd class currents @ Belle-II Pablo Roig

cPT in the large-NC limit: simultaneous expansion in p2, m2 and 1/NC

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Data-driven ph & ph’ VFFs

Towards the discovery of 2nd class currents @ Belle-II Pablo Roig

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Relation between KK,ph,ph’ SFFs

Towards the discovery of 2nd class currents @ Belle-II Pablo Roig

In previous works we showed that a Breit-Wigner description of SFFs fails to account for the data in t  K(p/h) nt decays.

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Relation between KK,ph,ph’ SFFs

Towards the discovery of 2nd class currents @ Belle-II Pablo Roig

In previous works we showed that a Breit-Wigner description of SFFs fails to account for the data in t  K(p/h) nt decays. This is not surprising since BWs violate analyticity and unitarity and do not comply with chiral symmetry requirements.

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Relation between KK,ph,ph’ SFFs

Towards the discovery of 2nd class currents @ Belle-II Pablo Roig

In previous works we showed that a Breit-Wigner description of SFFs fails to account for the data in t  K(p/h) nt decays. This is not surprising since BWs violate analyticity and unitarity and do not comply with chiral symmetry requirements. Although theory says BWs should not be applied, sometimes they are an easy solution fo the experimentalists.

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Relation between KK,ph,ph’ SFFs

Towards the discovery of 2nd class currents @ Belle-II Pablo Roig

In previous works we showed that a Breit-Wigner description of SFFs fails to account for the data in t  K(p/h) nt decays. This is not surprising since BWs violate analyticity and unitarity and do not comply with chiral symmetry requirements. Although theory says BWs should not be applied, sometimes they are an easy solution fo the experimentalists. That is why we decided to start our analyses with them (again).

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Relation between KK,ph,ph’ SFFs

Towards the discovery of 2nd class currents @ Belle-II Pablo Roig

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Relation between KK,ph,ph’ SFFs

Towards the discovery of 2nd class currents @ Belle-II Pablo Roig Real part of the loop neglected Violation of analyticity (Brodsky-Lepage)

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Relation between KK,ph,ph’ SFFs

Towards the discovery of 2nd class currents @ Belle-II Pablo Roig We have also considered a two-resonance BW SFF Now both normalized FFs differ!

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Relation between KK,ph,ph’ SFFs

Towards the discovery of 2nd class currents @ Belle-II Pablo Roig

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Relation between KK,ph,ph’ SFFs

Towards the discovery of 2nd class currents @ Belle-II Pablo Roig Errors known, correlations unknown!

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Relation between KK,ph,ph’ SFFs

Towards the discovery of 2nd class currents @ Belle-II Pablo Roig

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Relation between KK,ph,ph’ SFFs

Towards the discovery of 2nd class currents @ Belle-II Pablo Roig (Brodsky-Lepage)

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Relation between KK,ph,ph’ SFFs

Towards the discovery of 2nd class currents @ Belle-II Pablo Roig

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Relation between KK,ph,ph’ SFFs

Towards the discovery of 2nd class currents @ Belle-II Pablo Roig

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Relation between KK,ph,ph’ SFFs

Towards the discovery of 2nd class currents @ Belle-II Pablo Roig Very different normalized FFs!

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Relation between KK,ph,ph’ SFFs

Towards the discovery of 2nd class currents @ Belle-II Pablo Roig ‘traditional’ iterative solution

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Relation between KK,ph,ph’ SFFs

Towards the discovery of 2nd class currents @ Belle-II Pablo Roig Closed-form solution A closed-form solution is much less time-consuming than the „traditional‟ iterative method, which is great for fits and MC generators (TAUOLA)

  • O. Shekhovtsova , T. Przedzinski, P. Roig & Z. Was. Phys.Rev. D86 (2012) 113008
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Relation between KK,ph,ph’ SFFs

Towards the discovery of 2nd class currents @ Belle-II Pablo Roig Closed-form solution Very different normalized FFs! Crucial coupled channels corrections!

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Relation between KK,ph,ph’ SFFs

Towards the discovery of 2nd class currents @ Belle-II Pablo Roig Closed-form solution

We can also consider coupling ph & ph’ to KK

Very different normalized FFs! Crucial coupled channels corrections! Strong effect of coupling to KK! a0(980) as KK molecule

  • r tetraquark
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Relation between KK,ph,ph’ SFFs

Towards the discovery of 2nd class currents @ Belle-II Pablo Roig Straightforward generalization of 2-coupled channels case (closed-form solution)

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Relation between KK,ph,ph’ SFFs

Towards the discovery of 2nd class currents @ Belle-II Pablo Roig

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Relation between KK,ph,ph’ SFFs

Towards the discovery of 2nd class currents @ Belle-II Pablo Roig

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Relation between KK,ph,ph’ SFFs

Towards the discovery of 2nd class currents @ Belle-II Pablo Roig

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Towards the discovery of 2nd class currents @ Belle-II Pablo Roig

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Towards the discovery of 2nd class currents @ Belle-II Pablo Roig

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Towards the discovery of 2nd class currents @ Belle-II Pablo Roig

Errors due to p-h-h’ mixing

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Meaningless uncorrelated error analysis

Towards the discovery of 2nd class currents @ Belle-II Pablo Roig

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Predictions for ph’

Towards the discovery of 2nd class currents @ Belle-II Pablo Roig

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Science-fiction measurement?

Towards the discovery of 2nd class currents @ Belle-II Pablo Roig

Same FF‟s but they are real in hl3 while complex in t decays

In h decays SFF is suppressed by ml

2, while it dominates the corresponding t decays

BESIII @ 90% CL

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Science-fiction measurement?

Towards the discovery of 2nd class currents @ Belle-II Pablo Roig

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CONCLUSIONS

  • We improve the SM description of the tph(’)nt
  • decays. VFF predictions are sharp, while (dominating)

SFF’s have large uncertainties.

Towards the discovery of 2nd class currents @ Belle-II Pablo Roig

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CONCLUSIONS

  • We improve the SM description of the tph(’)nt
  • decays. VFF predictions are sharp, while (dominating)

SFF’s have large uncertainties.

  • Discovery of (SM) 2nd class currents through these

decay modes should be possible @ Belle-II.

Towards the discovery of 2nd class currents @ Belle-II Pablo Roig

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CONCLUSIONS

  • We improve the SM description of the tph(’)nt
  • decays. VFF predictions are sharp, while (dominating)

SFF’s have large uncertainties.

  • Discovery of (SM) 2nd class currents through these

decay modes should be possible @ Belle-II.

  • SU(2) New Physics signals may show up.

Towards the discovery of 2nd class currents @ Belle-II Pablo Roig

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CONCLUSIONS

  • We improve the SM description of the tph(’)nt
  • decays. VFF predictions are sharp, while (dominating)

SFF’s have large uncertainties.

  • Discovery of (SM) 2nd class currents through these

decay modes should be possible @ Belle-II.

  • SU(2) New Physics signals may show up.
  • The search for these decays will be driven by the

Mexican node of the Belle-II Collaboration (Michel Hernández, Eduard & Gabriel’s student).

Towards the discovery of 2nd class currents @ Belle-II Pablo Roig

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CONCLUSIONS

  • We improve the SM description of the tph(’)nt
  • decays. VFF predictions are sharp, while (dominating)

SFF’s have large uncertainties.

  • Discovery of (SM) 2nd class currents through these

decay modes should be possible @ Belle-II.

  • SU(2) New Physics signals may show up.
  • The search for these decays will be leaded by the

Mexican node of the Belle-II Collaboration.

Towards the discovery of 2nd class currents @ Belle-II Pablo Roig

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CONCLUSIONS

  • We improve the SM description of the tph(’)nt
  • decays. VFF predictions are sharp, while (dominating)

SFF’s have large uncertainties.

  • Discovery of (SM) 2nd class currents through these

decay modes should be possible @ Belle-II.

  • SU(2) New Physics signals may show up.
  • The search for these decays will be driven by the

Mexican node of the Belle-II Collaboration.

  • México is also contributing coding the relevant SM

FFs in TAUOLA and predicting the most important SM bkg (tph(’)gnt Adolfo Guevara, Gabriel & PR).

Towards the discovery of 2nd class currents @ Belle-II Pablo Roig

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ANUNCIO

Se oferta un posdoc de dos años (1+1) asociado al proyecto de Ciencia Básica del Dr. Gabriel López Castro (Cinvestav, México DF) en el área de “Física de sabor: fenomenología” para comenzar en Abril de 2016. La convocatoria se realizará próximamente a través de las listas de correo de la DPyC y RED-FAE.

Towards the discovery of 2nd class currents @ Belle-II Pablo Roig