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179 results on '"Sachrajda, C.T."'

1. Simulating rare kaon decays $K^{+}\to\pi^{+}\ell^{+}\ell^{-}$ using domain wall lattice QCD with physical light quark masses

Author

Boyle, P.A., Erben, F., Flynn, J.M., Gülpers, V., Hill, R.C., Hodgson, R., Jüttner, A., hÓgáin, F.Ó., Portelli, A., and Sachrajda, C.T.

Subjects
High Energy Physics - Phenomenology, High Energy Physics - Lattice, High Energy Physics::Lattice, High Energy Physics::Phenomenology, hep-lat, hep-ph, Particle Physics - Lattice, High Energy Physics::Experiment, Particle Physics - Phenomenology
Abstract

We report the first calculation using physical light-quark masses of the electromagnetic form factor $V(z)$ describing the long-distance contributions to the $K^+\to\pi^+\ell^+\ell^-$ decay amplitude. The calculation is performed on a 2+1 flavor domain wall fermion ensemble with inverse lattice spacing $a^{-1}=1.730(4)$GeV. We implement a Glashow-Iliopoulos-Maiani cancellation by extrapolating to the physical charm-quark mass from three below-charm masses. We obtain $V(z=0.013(2))=-0.87(4.44)$, achieving a bound for the value. The large statistical error arises from stochastically estimated quark loops., Comment: 11 pages, 8 figures

Published
2022

2. Simulating rare kaon decays $K^{+}\toπ^{+}\ell^{+}\ell^{-}$ using domain wall lattice QCD with physical light quark masses

Author

Boyle, P. A., Erben, F., Flynn, J. M., Gülpers, V., Hill, R.C., Hodgson, R., Jüttner, A., hÓgáin, F. Ó, Portelli, A., and Sachrajda, C.T.

Subjects
High Energy Physics - Phenomenology (hep-ph), High Energy Physics::Lattice, High Energy Physics::Phenomenology, High Energy Physics - Lattice (hep-lat), FOS: Physical sciences, High Energy Physics::Experiment
Abstract

We report the first calculation using physical light-quark masses of the electromagnetic form factor $V(z)$ describing the long-distance contributions to the $K^+\toπ^+\ell^+\ell^-$ decay amplitude. The calculation is performed on a 2+1 flavor domain wall fermion ensemble with inverse lattice spacing $a^{-1}=1.730(4)$GeV. We implement a Glashow-Iliopoulos-Maiani cancellation by extrapolating to the physical charm-quark mass from three below-charm masses. We obtain $V(z=0.013(2))=-0.87(4.44)$, achieving a bound for the value. The large statistical error arises from stochastically estimated quark loops., 11 pages, 8 figures

Published
2022
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3. Lattice determination of $I= 0$ and 2 $\pi\pi$ scattering phase shifts with a physical pion mass

Author

Blum, T., Boyle, P.A., Bruno, M., Christ, N.H., Hoying, D., Kelly, C., Lehner, C., Mawhinney, R.D., Meyer, A.S., Murphy, D.J., Sachrajda, C.T., Soni, A., and Wang, T.

Subjects
High Energy Physics - Phenomenology, High Energy Physics - Lattice, nucl-th, Nuclear Theory, Nuclear Physics - Theory, hep-lat, hep-ph, Particle Physics - Lattice, Particle Physics - Phenomenology
Abstract

Phase shifts for $s$-wave $\pi\pi$ scattering in both the $I=0$ and $I=2$ channels are determined from a lattice QCD calculation performed on 741 gauge configurations obeying G-parity boundary conditions with a physical pion mass and lattice size of $32^3\times 64$. These results support our recent study of direct CP violation in $K\to\pi\pi$ decay \cite{Abbott:2020hxn}, improving our earlier 2015 calculation \cite{Bai:2015nea}. The phase shifts are determined for both stationary and moving $\pi\pi$ systems, at three ($I=0$) and four ($I=2$) different total momenta. We implement several $\pi\pi$ interpolating operators including a scalar bilinear "$\sigma$" operator and paired single-pion bilinear operators with the constituent pions carrying various relative momenta. Several techniques, including correlated fitting and a bootstrap determination of p-values have been used to refine the results and a comparison with the generalized eigenvalue problem (GEVP) method is given. A detailed systematic error analysis is performed which allows phase shift results to be presented at a fixed energy., Comment: v3: Add a subsection "Higher partial wave correction", and correct the unit of scattering length. 88 pages and 14 figures v2: 1). Add reference 29 as an example of pipi scattering calculation above 4mpi threshold. 2). Modify the wording on page 3 for the footage. 3). Correct the \sigma operator on page 17

Published
2021

13. Low energy constants of S U (2 ) partially quenched chiral perturbation theory from Nf=2 +1 domain wall QCD

Author

Boyle, P.A., Christ, N.H., Garron, N., Jung, C., Juttner, A., Kelly, C., Mawhinney, R.D., McGlynn, G., Murphy, D.J., Ohta, S., Portelli, A., and Sachrajda, C.T.

Subjects
High Energy Physics::Lattice, High Energy Physics::Phenomenology, Nuclear Theory
Abstract

We have performed fits of the pseudoscalar masses and decay constants, from a variety of the RBC-UKQCD Collaboration's domain wall fermion ensembles, to S U (2 ) partially quenched chiral perturbation theory at next-to-leading order (NLO) and next-to-next-to-leading order (NNLO). We report values for nine NLO and eight linearly independent combinations of NNLO partially quenched low-energy constants, which we compare to other lattice and phenomenological determinations. We discuss the size of successive terms in the chiral expansion and use our large set of low-energy constants to make predictions for mass splittings due to QCD isospin-breaking effects and the S-wave π π scattering lengths. We conclude that, for the range of pseudoscalar masses explored in this work, 115 MeV ≲mPS≲430 MeV , the NNLO S U (2 ) expansion is quite robust and can fit lattice data with percent-scale accuracy.

Published
2016
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17. New Frontiers in Lattice Gauge Theories

Author

Aoki, S., Bernard, C., Blum, T., D’Elia, M., Jansen, K., Rossi, G.C., and Sachrajda, C.T.

Abstract

The international workshop “New Frontiers in Lattice Gauge Theories” took place at the Galileo Galilei Institute in Florence from August 27th to September 28th, 2012. The workshop brought together top experts in lattice gauge theory from around the world, making it possible for them to interact closely over an extended period of time. The goal was to provide a further boost to the already impressive precision of lattice calculations and to increase their impact on the full range of the new high-energy experimental data., Il Colle di Galileo, Vol 2, No 1 (2013)

Published
2013
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19. Emerging understanding of the ΔI = 1/2 rule from lattice QCD

Author

Boyle, P.A., Christ, N.H., Garron, N., Goode, E.J., Janowski, T., Lehner, C., Liu, Q., Lytle, A. T., Sachrajda, C.T., Soni, A., and Zhang, D.

Abstract

There has been much speculation as to the origin of the ΔI = 1/2 rule (ReA0/ReA2 ~ 22.5). We find that the two dominant contributions to the ΔI = 3/2, K → π π correlation functions have opposite signs, leading to a significant cancelation. This partial cancelation occurs in our computation of ReA2 with physical quark masses and kinematics (where we reproduce the experimental value of A2) and also for heavier pions at threshold. For ReA0, although we do not have results at physical kinematics, we do have results for pions at zero momentum with mπ ~ 420 MeV [ReA0/ReA2 = 9.1 (2.1)] and mπ ~ 330 MeV [ReA0/ReA2 = 12.0 (1.7)]. The contributions which partially cancel in ReA2 are also the largest ones in ReA0, but now they have the same sign and so enhance this amplitude. The emerging explanation of the ΔI = 1/2 rule is a combination of the perturbative running to scales of O (2 GeV), a relative suppression of ReA2 through the cancelation of the two dominant contributions, and the corresponding enhancement of ReA0. QCD and electroweak penguin operators make only very small contributions at such scales.

Published
2013

20. Light Meson Distribution Amplitudes

Author

Arthur, R., Boyle, P.A., Brommel, D., Donnellan, M.A., Flynn, J.M., Juttner, A., de Lima, H.Pedroso, Rae, T.D., Sachrajda, C.T., and Samways, B.

Subjects
High Energy Physics - Lattice, High Energy Physics::Lattice, High Energy Physics - Lattice (hep-lat), FOS: Physical sciences, Particle Physics - Lattice
Abstract

We calculated the first two moments of the light-cone distribution amplitudes for the pseudoscalar mesons ($\pi$ and $K$) and the longitudinally polarised vector mesons ($\rho$, $K^*$ and $\phi$) as part of the UKQCD and RBC collaborations' $N_f=2+1$ domain-wall fermion phenomenology programme. These quantities were obtained with a good precision and, in particular, the expected effects of $SU(3)$-flavour symmetry breaking were observed. Operators were renormalised non-perturbatively and extrapolations to the physical point were made, guided by leading order chiral perturbation theory. The main results presented are for two volumes, $16^3\times 32$ and $24^3\times 64$, with a common lattice spacing. Preliminary results for a lattice with a finer lattice spacing, $32^3\times64$, are discussed and a first look is taken at the use of twisted boundary conditions to extract distribution amplitudes., Comment: 7 pages, 3 figures. Talk given by Thomas Rae at the XXVIII International Symposium on Lattice Field Theory (Lattice 2010), Villasimius, Italy, June 2010

Published
2010

21. Effects of Quenching in AI = 1/2 Kaon Decays

Author

Lin, C.-J.D., Martinelli, G., Pallante, E., Sachrajda, C.T., Villadoro, G., and Van Swinderen Institute for Particle Physics and G

Subjects
High Energy Physics::Lattice, High Energy Physics::Phenomenology, High Energy Physics::Experiment
Abstract

We present the inconsistencies which arise in quenched QCD in AI = 1/2 non-leptonic kaon decays using chiral perturbation theory (χPT) to one loop. In particular we discuss how the lack of unitarity of the quenched theory invalidates the usual methods for the extraction of matrix elements from correlation functions.

Published
2003

22. Review of Particle Physics

Author

Amsler, C., primary, Doser, M., additional, Antonelli, M., additional, Asner, D.M., additional, Babu, K.S., additional, Baer, H., additional, Band, H.R., additional, Barnett, R.M., additional, Bergren, E., additional, Beringer, J., additional, Bernardi, G., additional, Bertl, W., additional, Bichsel, H., additional, Biebel, O., additional, Bloch, P., additional, Blucher, E., additional, Blusk, S., additional, Cahn, R.N., additional, Carena, M., additional, Caso, C., additional, Ceccucci, A., additional, Chakraborty, D., additional, Chen, M.-C., additional, Chivukula, R.S., additional, Cowan, G., additional, Dahl, O., additional, D'Ambrosio, G., additional, Damour, T., additional, de Gouvêa, A., additional, DeGrand, T., additional, Dobrescu, B., additional, Drees, M., additional, Edwards, D.A., additional, Eidelman, S., additional, Elvira, V.D., additional, Erler, J., additional, Ezhela, V.V., additional, Feng, J.L., additional, Fetscher, W., additional, Fields, B.D., additional, Foster, B., additional, Gaisser, T.K., additional, Garren, L., additional, Gerber, H.-J., additional, Gerbier, G., additional, Gherghetta, T., additional, Giudice, G.F., additional, Goodman, M., additional, Grab, C., additional, Gritsan, A.V., additional, Grivaz, J.-F., additional, Groom, D.E., additional, Grünewald, M., additional, Gurtu, A., additional, Gutsche, T., additional, Haber, H.E., additional, Hagiwara, K., additional, Hagmann, C., additional, Hayes, K.G., additional, Hernández-Rey, J.J., additional, Hikasa, K., additional, Hinchliffe, I., additional, Höcker, A., additional, Huston, J., additional, Igo-Kemenes, P., additional, Jackson, J.D., additional, Johnson, K.F., additional, Junk, T., additional, Karlen, D., additional, Kayser, B., additional, Kirkby, D., additional, Klein, S.R., additional, Knowles, I.G., additional, Kolda, C., additional, Kowalewski, R.V., additional, Kreitz, P., additional, Krusche, B., additional, Kuyanov, Yu.V., additional, Kwon, Y., additional, Lahav, O., additional, Langacker, P., additional, Liddle, A., additional, Ligeti, Z., additional, Lin, C.-J., additional, Liss, T.M., additional, Littenberg, L., additional, Liu, J.C., additional, Lugovsky, K.S., additional, Lugovsky, S.B., additional, Mahlke, H., additional, Mangano, M.L., additional, Mannel, T., additional, Manohar, A.V., additional, Marciano, W.J., additional, Martin, A.D., additional, Masoni, A., additional, Milstead, D., additional, Miquel, R., additional, Mönig, K., additional, Murayama, H., additional, Nakamura, K., additional, Narain, M., additional, Nason, P., additional, Navas, S., additional, Nevski, P., additional, Nir, Y., additional, Olive, K.A., additional, Pape, L., additional, Patrignani, C., additional, Peacock, J.A., additional, Piepke, A., additional, Punzi, G., additional, Quadt, A., additional, Raby, S., additional, Raffelt, G., additional, Ratcliff, B.N., additional, Renk, B., additional, Richardson, P., additional, Roesler, S., additional, Rolli, S., additional, Romaniouk, A., additional, Rosenberg, L.J., additional, Rosner, J.L., additional, Sachrajda, C.T., additional, Sakai, Y., additional, Sarkar, S., additional, Sauli, F., additional, Schneider, O., additional, Scott, D., additional, Seligman, W.G., additional, Shaevitz, M.H., additional, Sjöstrand, T., additional, Smith, J.G., additional, Smoot, G.F., additional, Spanier, S., additional, Spieler, H., additional, Stahl, A., additional, Stanev, T., additional, Stone, S.L., additional, Sumiyoshi, T., additional, Tanabashi, M., additional, Terning, J., additional, Titov, M., additional, Tkachenko, N.P., additional, Törnqvist, N.A., additional, Tovey, D., additional, Trilling, G.H., additional, Trippe, T.G., additional, Valencia, G., additional, van Bibber, K., additional, Vincter, M.G., additional, Vogel, P., additional, Ward, D.R., additional, Watari, T., additional, Webber, B.R., additional, Weiglein, G., additional, Wells, J.D., additional, Whalley, M., additional, Wheeler, A., additional, Wohl, C.G., additional, Wolfenstein, L., additional, Womersley, J., additional, Woody, C.L., additional, Workman, R.L., additional, Yamamoto, A., additional, Yao, W.-M., additional, Zenin, O.V., additional, Zhang, J., additional, Zhu, R.-Y., additional, Zyla, P.A., additional, Harper, G., additional, Lugovsky, V.S., additional, and Schaffner, P., additional

Published
2008
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28. Review of Particle Physics

Author

Eidelman, S., primary, Hayes, K.G., additional, Olive, K.A., additional, Aguilar-Benitez, M., additional, Amsler, C., additional, Asner, D., additional, Babu, K.S., additional, Barnett, R.M., additional, Beringer, J., additional, Burchat, P.R., additional, Carone, C.D., additional, Caso, S., additional, Conforto, G., additional, Dahl, O., additional, D'Ambrosio, G., additional, Doser, M., additional, Feng, J.L., additional, Gherghetta, T., additional, Gibbons, L., additional, Goodman, M., additional, Grab, C., additional, Groom, D.E., additional, Gurtu, A., additional, Hagiwara, K., additional, Hernández-Rey, J.J., additional, Hikasa, K., additional, Honscheid, K., additional, Jawahery, H., additional, Kolda, C., additional, Kwon, Y., additional, Mangano, M.L., additional, Manohar, A.V., additional, March-Russell, J., additional, Masoni, A., additional, Miquel, R., additional, Mönig, K., additional, Murayama, H., additional, Nakamura, K., additional, Navas, S., additional, Pape, L., additional, Patrignani, C., additional, Piepke, A., additional, Raffelt, G., additional, Roos, M., additional, Tanabashi, M., additional, Terning, J., additional, Törnqvist, N.A., additional, Trippe, T.G., additional, Vogel, P., additional, Wohl, C.G., additional, Workman, R.L., additional, Yao, W.-M., additional, Zyla, P.A., additional, Armstrong, B., additional, Gee, P.S., additional, Harper, G., additional, Lugovsky, K.S., additional, Lugovsky, S.B., additional, Lugovsky, V.S., additional, Rom, A., additional, Artuso, M., additional, Barberio, E., additional, Battaglia, M., additional, Bichsel, H., additional, Biebel, O., additional, Bloch, P., additional, Cahn, R.N., additional, Casper, D., additional, Cattai, A., additional, Chivukula, R.S., additional, Cowan, G., additional, Damour, T., additional, Desler, K., additional, Dobbs, M.A., additional, Drees, M., additional, Edwards, A., additional, Edwards, D.A., additional, Elvira, V.D., additional, Erler, J., additional, Ezhela, V.V., additional, Fetscher, W., additional, Fields, B.D., additional, Foster, B., additional, Froidevaux, D., additional, Fukugita, M., additional, Gaisser, T.K., additional, Garren, L., additional, Gerber, H.-J., additional, Gerbier, G., additional, Gilman, F.J., additional, Haber, H.E., additional, Hagmann, C., additional, Hewett, J., additional, Hinchliffe, I., additional, Hogan, C.J., additional, Höhler, G., additional, Igo-Kemenes, P., additional, Jackson, J.D., additional, Johnson, K.F., additional, Karlen, D., additional, Kayser, B., additional, Kirkby, D., additional, Klein, S.R., additional, Kleinknecht, K., additional, Knowles, I.G., additional, Kreitz, P., additional, Kuyanov, Yu.V., additional, Lahav, O., additional, Langacker, P., additional, Liddle, A., additional, Littenberg, L., additional, Manley, D.M., additional, Martin, A.D., additional, Narain, M., additional, Nason, P., additional, Nir, Y., additional, Peacock, J.A., additional, Quinn, H.R., additional, Raby, S., additional, Ratcliff, B.N., additional, Razuvaev, E.A., additional, Renk, B., additional, Rolandi, G., additional, Ronan, M.T., additional, Rosenberg, L.J., additional, Sachrajda, C.T., additional, Sakai, Y., additional, Sanda, A.I., additional, Sarkar, S., additional, Schmitt, M., additional, Schneider, O., additional, Scott, D., additional, Seligman, W.G., additional, Shaevitz, M.H., additional, Sjöstrand, T., additional, Smoot, G.F., additional, Spanier, S., additional, Spieler, H., additional, Spooner, N.J.C., additional, Srednicki, M., additional, Stahl, A., additional, Stanev, T., additional, Suzuki, M., additional, Tkachenko, N.P., additional, Trilling, G.H., additional, Valencia, G., additional, van Bibber, K., additional, Vincter, M.G., additional, Ward, D.R., additional, Webber, B.R., additional, Whalley, M., additional, Wolfenstein, L., additional, Womersley, J., additional, Woody, C.L., additional, Zenin, O.V., additional, and Zhu, R.-Y., additional

Published
2004
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29. Gauge & Higgs boson summary table

Author

Eidelman, S., primary, Hayes, K.G., additional, Olive, K.A., additional, Aguilar-Benitez, M., additional, Amsler, C., additional, Asner, D., additional, Babu, K.S., additional, Barnett, R.M., additional, Beringer, J., additional, Burchat, P.R., additional, Carone, C.D., additional, Caso, C., additional, Conforto, G., additional, Dahl, O., additional, D'Ambrosio, G., additional, Doser, M., additional, Feng, J.L., additional, Gherghetta, T., additional, Gibbons, L., additional, Goodman, M., additional, Grab, C., additional, Groom, D.E., additional, Gurtu, A., additional, Hagiwara, K., additional, Hernández-Rey, J.J., additional, Hikasa, K., additional, Honscheid, K., additional, Jawahery, H., additional, Kolda, C., additional, Kwon, Y., additional, Mangano, M.L., additional, Manohar, A.V., additional, March-Russell, J., additional, Masoni, A., additional, Miquel, R., additional, Mönig, K., additional, Murayama, H., additional, Nakamura, K., additional, Navas, S., additional, Pape, L., additional, Patrignani, C., additional, Piepke, A., additional, Raffelt, G., additional, Roos, M., additional, Tanabashi, M., additional, Terning, J., additional, Törnqvist, N.A., additional, Trippe, T.G., additional, Vogel, P., additional, Wohl, C.G., additional, Workman, R.L., additional, Yao, W.-M., additional, Zyla, P.A., additional, Armstrong, B., additional, Gee, P.S., additional, Harper, G., additional, Lugovsky, K.S., additional, Lugovsky, S.B., additional, Lugovsky, V.S., additional, Rom, A., additional, Artuso, M., additional, Barberio, E., additional, Battaglia, M., additional, Bichsel, H., additional, Biebel, O., additional, Bloch, P., additional, Cahn, R.N., additional, Casper, D., additional, Cattai, A., additional, Chivukula, R.S., additional, Cowan, G., additional, Damour, T., additional, Desler, K., additional, Dobbs, M.A., additional, Drees, M., additional, Edwards, A., additional, Edwards, D.A., additional, Elvira, V.D., additional, Erler, J., additional, Ezhela, V.V., additional, Fetscher, W., additional, Fields, B.D., additional, Foster, B., additional, Froidevaux, D., additional, Fukugita, M., additional, Gaisser, T.K., additional, Garren, L., additional, Gerber, H.-J., additional, Gerbier, G., additional, Gilman, F.J., additional, Haber, H.E., additional, Hagmann, C., additional, Hewett, J., additional, Hinchliffe, I., additional, Hogan, C.J., additional, Höhler, G., additional, Igo-Kemenes, P., additional, Jackson, J.D., additional, Johnson, K.F., additional, Karlen, D., additional, Kayser, B., additional, Kirkby, D., additional, Klein, S.R., additional, Kleinknecht, K., additional, Knowles, I.G., additional, Kreitz, P., additional, Kuyanov, Yu.V., additional, Lahav, O., additional, Langacker, P., additional, Liddle, A., additional, Littenberg, L., additional, Manley, D.M., additional, Martin, A.D., additional, Narain, M., additional, Nason, P., additional, Nir, Y., additional, Peacock, J.A., additional, Quinn, H.R., additional, Raby, S., additional, Ratcliff, B.N., additional, Razuvaev, E.A., additional, Renk, B., additional, Rolandi, G., additional, Ronan, M.T., additional, Rosenberg, L.J., additional, Sachrajda, C.T., additional, Sakai, Y., additional, Sanda, A.I., additional, Sarkar, S., additional, Schmitt, M., additional, Schneider, O., additional, Scott, D., additional, Seligman, W.G., additional, Shaevitz, M.H., additional, Sjöstrand, T., additional, Smoot, G.F., additional, Spanier, S., additional, Spieler, H., additional, Spooner, N.J.C., additional, Srednicki, M., additional, Stahl, A., additional, Stanev, T., additional, Suzuki, M., additional, Tkachenko, N.P., additional, Trilling, G.H., additional, Valencia, G., additional, van Bibber, K., additional, Vincter, M.G., additional, Ward, D.R., additional, Webber, B.R., additional, Whalley, M., additional, Wolfenstein, L., additional, Womersley, J., additional, Woody, C.L., additional, Zenin, O.V., additional, and Zhu, R.-Y., additional

Published
2004
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30. Matrix elements of decays

Author

Boucaud, Ph., primary, Giménez, V., additional, Lin, C.-J.D., additional, Lubicz, V., additional, Martinelli, G., additional, Papinutto, M., additional, and Sachrajda, C.T., additional

Published
2004
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34. Kaon weak matrix elements with Wilson fermions

Author

Becirevic, D., primary, Boucaud, Ph., additional, Gime´nez, V., additional, Lin, C.-J.D., additional, Lubicz, V., additional, Martinelli, G., additional, Papinutto, M., additional, and Sachrajda, C.T., additional

Published
2003
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46. New lattice approaches to the rule

Author

Dawson, C., primary, Martinelli, G., additional, Rossi, G.C., additional, Sachrajda, C.T., additional, Sharpe, S., additional, Talevi, M., additional, and Testa, M., additional

Published
1998
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