A precision measurement of direct CP violation in the decay of neutral kaons into two pions

Batley, J. R.; Dosanjh, R.S.; Gershon, T.; Kalmus, G.; Lazzeroni, C.; Munday, D.J.; Olaiya, E.; Patel, M.; Parker, M. A.; White, T. O.; Wotton, S. A.; Arcidiacono, R.; Barr, G.; Bocquet, G.; Ceccucci, A.; Çuhadar-Dönszelmann, T.; Cundy, D.; Doble, N.; Falaleev, V.; Gatignon, L.; Gonidec, A.; Gorini, B.; Grafström, P.; Kubischta, W.; Mikulec, I.; Norton, A.; Palestini, S.; Panzer-Steindel, B.; Schinzel, D.; Wahl, H.; Cheshkov, C.; Hristov, P.; Kekelidze, V.; Madigojine, D.; Molokanova, N.; Potrebenikov, Yu.; Zinchenko, A.; Rubin, P.; Sacco, R.; Walker, A.; Bettoni, D.; Calabrese, R.; Dalpiaz, P.; Duclos, J.; Frabetti, P. L.; Gianoli, A.; Martini, M.; Masetti, L.; Petrucci, F.; Savrié, M.; Scarpa, M.; Bizzeti, A.; Calvetti, M.; Collazuol, G.; Iacopini, E.; Lenti, M.; Martelli, F.; Ruggiero, G.; Veltri, M.; Coward, D.; Eppard, M.; Hirstius, A.; Holtz, K.; Kleinknecht, K.; Koch, U.; Köpke, L.; Silva, P Lopes da; Marouelli, P.; Mestvirishvili, I.; Morales, C. Morales; Pellmann, I.; Peters, A.; Renk, B.; Schmidt, S.; Schönharting, V.; Wanke, R.; Winhart, A.; Chollet, J.C.; Fayard, L.; Graziani, G.; Iconomidou-Fayard, L.; Unal, G.; Wingerter-Seez, I.; Anzivino, G.; Cenci, P.; Imbergamo, E.; Lamanna, G.; Lubrano, P.; Mestvirishvili, A.; Nappi, A.; Pepé, M.; Piccini, M.; Valdata‐Nappi, M.; Casali, R.; Cerri, C.; Cirilli, M.; Costantini, F.; Fantechi, R.; Fiorini, L.; Giudici, S.; Mannelli, I.; Pierazzini, G.; Sozzi, M.; Chèze, J.B.; Beer, M. De; Debu, P.; Derue, F.; Formica, A.; Gouge, G.; Marel, G.; Mazzucato, E.; Peyaud, B.; Turlay, R.; Vallage, B.; Holder, M.; Maier, A.; Ziółkowski, M.; Biino, C.; Cartiglia, N.; Clemencic, M.; Marchetto, F.; Menichetti, E.; Pastrone, N.; Nassalski, J.; Rondio, E.; Wiślicki, W.; Wronka, S.; Dibon, H.; Jeitler, M.; Markytan, M.; Neuhofer, G.; Pernicka, M.; Taurok, A.; Widhalm, L.

doi:10.1016/s0370-2693(02)02476-0

Cited by 227 publications

(155 citation statements)

References 26 publications

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“…This result differs by 2.9 σ significance from the experimental world average from NA48 [7] and KTeV [8,9] collaborations, (ε /ε) exp = (16.6 ± 2.3) × 10 −4 ,…”

Section: Introductioncontrasting

confidence: 60%

The Revival of Kaon Flavour Physics

Buras¹

2016

EPJ Web Conf.

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Abstract. After years of silence we should witness in the rest of this decade and in the next decade the revival of kaon flavour physics. This is not only because of the crucial measurements of the branching ratios for the rare decays K + → π + νν and K L → π 0 νν by NA62 and KOTO that being theoretically clean and very sensitive to new physics (NP) could hint for new phenomena even beyond the reach of the LHC without any significant theoretical uncertainties. Indeed simultaneously the advances in the calculations of perturbative and in particular non-perturbative QCD effects in ε /ε, ε K , ΔM K , K L → μ + μ − and K L → π 0 + − will increase the role of these observables in searching for NP. In fact the hints for NP contributing to ε /ε have been already signalled last year through improved estimates of hadronic matrix elements of QCD and electroweak penguin operators Q 6 and Q 8 by lattice QCD and large N dual QCD approach. This talk summarizes in addition to this new flavour anomaly the present highlights of this field including some results from concrete NP scenarios.

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“…This result differs by 2.9 σ significance from the experimental world average from NA48 [7] and KTeV [8,9] collaborations, (ε /ε) exp = (16.6 ± 2.3) × 10 −4 ,…”

Section: Introductioncontrasting

confidence: 60%

The Revival of Kaon Flavour Physics

Buras¹

2016

EPJ Web Conf.

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“…While direct CP violation (CPV) is well established in the down-quark sector [1][2][3][4][5][6][7][8][9][10][11], CPV has not yet been observed in the decays of up-type quarks. For the discussion of CPV in some singly Cabibbo-suppressed D decay it is convenient to decompose the decay amplitude A as…”

Section: Introductionmentioning

confidence: 99%

CPviolation inD0→KSK
Nierste
¹
,
Schacht
²

2015
Phys. Rev. D
55
5
58
0
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The direct CP asymmetry a dir CP (D 0 → KSKS) involves exchange diagrams which are induced at tree level in the Standard Model. Since the corresponding topological amplitude EKK can be large, D 0 → KSKS is a promising discovery channel for charm CP violation. We estimate the penguin annihilation amplitude with a perturbative calculation and extract the exchange amplitude EKK from a global fit to D branching ratios. Our results are further used to predict the size of mixing-induced CP violation. We obtain |a dir CP (D 0 → KSKS)| ≤ 1.1% (95% C.L.). The same bound applies to the nonuniversal part of the phase between the D −D mixing and decay amplitudes. If future data exceed our predictions, this will point to new physics or an enhancement of the penguin annihilation amplitude by QCD dynamics. We briefly discuss the implications of these possibilities for other CP asymmetries.

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“…The direct CP violation had been confirmed by [4], the world average value for the CP violating ratio ǫ ′ /ǫ is [5] Re(ǫ ′ /ǫ) = 1.8 ± 0.4 × 10 −3 .…”

Section: Introductionmentioning

confidence: 97%

Chargino contributions to / in the left–right supersymmetric model

Frank¹,

Nie²

2004

J. Phys. G: Nucl. Part. Phys.

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We analyze the chargino contributions to the CP violating ratio ǫ ′ /ǫ in the left-right supersymmetric model. We study the possibility that these contributions alone can saturate the experimental value of ǫ ′ /ǫ. We derive conservative bounds on supersymmetric flavor violation parameters in the up squark LL, RR, LR and RL sectors, using the mass insertion approximation. While the LL bounds are found to be consistent with the MSSM values, the LR constraints are new and much stronger.

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A precision measurement of direct CP violation in the decay of neutral kaons into two pions

Cited by 227 publications

References 26 publications

The Revival of Kaon Flavour Physics

The Revival of Kaon Flavour Physics

CPviolation inD0→KSK
Nierste
¹
,
Schacht
²

2015
Phys. Rev. D
55
5
58
0
View full text Add to dashboard Cite

Chargino contributions to / in the left–right supersymmetric model

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A precision measurement of direct CP violation in the decay of neutral kaons into two pions

Cited by 227 publications

References 26 publications

The Revival of Kaon Flavour Physics

The Revival of Kaon Flavour Physics

CPviolation inD0→KSKNierste1, Schacht2 2015Phys. Rev. D555580View full textAdd to dashboardCite

Chargino contributions to / in the left–right supersymmetric model

Contact Info

Product

Resources

About

CPviolation inD0→KSK
Nierste
¹
,
Schacht
²

2015
Phys. Rev. D
55
5
58
0
View full text Add to dashboard Cite