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One-loop Yukawa Couplings in Local Models

Authors
Joseph P. Conlon,Mark Goodsell
Eran Palti,Rui Filipe Pedreira Marques,Simaan AbouRizk,Ioannis Brilakis,Joanna Kapusta,Fabio Lopes Olivares,Olivier Ragueneau,Mitsugu Sohma,Eijun Itakura,sharad master,Daniella Schatz,Terry Carney,Marc Henneaux,Petr Levchenko,Aleksandra Skrabacz,Marcin Olszewski,Poul Damgaard,Ansgar Denner,Volodymyr Malyutenko,Leonardo Castellani,J. Luis Miramontes,Stephen Naculich,Carmelo P. Martin,Wilma Starke-Buzetti,Milagros Villasmil Molero,Assumpta Nnaggenda-Musana,Volker Adler,Stefan Scherer,Thomas Ferguson,Natalia Lazaretova,Diego P. Vázquez,Colin Bernet,Xinan Zhou,DIGAMBER PAWAR,Lorenz Eberhardt,Wael Haj Ahmad,Manuela Kulaxizi,Srinivasan Jagannathan,Lawrence Kennedy,Aurelien Bigot,Maria Sazanova,Alexander Haupt,Saleh Hamdan,Peter Wolfsteiner,Kosta Nikolić,Kristian Jensen,Bharat Char,Garrett Poe,Jelena Nikolić,Laura Ledesma,David Shih,Alain Jaccard,Carolyn Dzierba,Michael Johnson,Francesco Cilurzo,Marc Torrens,Benjamin Bellenie,Simone Giacomelli,Geofrey De Visscher,Andy Van Brocklin,Luis Garcés-Erice,Jing Shu,Seok Ki Choi,Robert Stala,Shulamit Levenberg,Gianluca Calcagni,Vishnu Ram OV,Jonathan Wall,José Tormos,Jose Endrino,Marie Connett,Bulent Basol,Pablo Montoya,Lorenzo Tancredi,Thorsten Alexander Kern,Christopher Herzog,Harri Mäkinen,Wai-Ching Lam,Martin Köhne,Claudia de Rham,David Clarke,Andre Lukas,Andrew Prokhorenkov,Josep D. Asis,Dan Andersen,Sónia Vladimira Correia,Nasuf SONMEZ,Fabio Maltoni,Martin Ward,Torsten Dahms,Jukka Suhonen,Martín Aluja,Dmitry Golubkov,M.M. Sheikh-Jabbari,Pol Bordas,Ada Campione,Valentin Geisler-Knünz,Li Ju,Aysel Kayis Topaksu,Esther Chávez-Miranda,Christopher Schadt,Jonathon Lookadoo,Hüseyin Bahtiyar,Rachel Bartek,Lothar Spiess,Paul Barrette,Leigh Gibson,John Hawdon,GIOVANNI SOTGIU,Kamila Kuros-Kowalska,Curt Sigmund,Parinya Karndumri,Eduardo Garcia-Valdecasas Tenreiro,Matthias Kaminski,SangHyun Lee,Andrei Parnachev,Dimitrios Lykomitros,Ahmet Umar,Neil Switz,Congkao Wen,Byron Wicks,Kavithaa Loganathan,Aninda Sinha,Tammy Ivins,Ingo Jordan,Nilanjan Brahma,Carlos Tamarit,Engel Roza,Paul Garrett,Sérgio Henrique Staut Brunini,Karin Bjerre,Andreja Istenic Starcic,Aleksi Vuorinen,Boris Pioline,Stefan Kallweit,Suprabh Prakash,Nuno Brandão,José María Pérez Collados,Cristina Albuquerque,Ezequiel Alvarez,Iosif Bena,Sai Putcha,Robert LoGalbo,Rong-Chi ,Stephane Coulombe,María de la Luz Casas-Perez,Matthias Gaberdiel,Vojtech Janousek,Christoph Stein,James Wetterer,Clara Cruz Santos,Brian Palik,Francesco Giordano,Gert Aarts,Gianluca Giavitto,Pierre Boudry,María-José Carrasco,Xian-Hui Ge,Arantza Oyanguren,Jeremy Dalseno,Andrew Frey,Oscar Vives,Timothy Hollowood,Simone Stracka,Nausheen Shah,Yu-Xiao Liu,Luc Demortier,Cheng-Wei Chiang,Walter Tangarife,Nicolas Neill,Peter Adshead,Tim Tait,Maurizio Martinelli,Choong Sun Kim,Iosif Breido,Ronnie Machielsen,Chan Youn Park,Connor Doak,Clara Amorim,Gabriele Travaglini,Young-Kyun Kwon,Andreas Brandhuber,Daniel O'Keefe,Jose Maria Alunda,Bin Wang,Niko Jokela,Stephen Wolfe,HIND ALKATAN,Sergio M. 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arXiv:1007.5145v1 [hep-th] 29 Jul 2010
CPHT-RR054.0710
DESY 10-115
OUTP-10/16P
One-loop Yukawa Couplings in Local Models
Joseph P. Conlon 1,2 , Mark Goodsell 3 and Eran Palti 4
1 Rudolf Peierls Center for Theoretical Physics, 1 Keble Road,
Oxford, OX1 3NP, United Kingdom
2 Balliol College, Oxford, OX1 3BJ, United Kingdom
3 Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, D-22603 Hamburg, Germany.
4 Centre de Physique Theorique, Ecole Polytechnique, CNRS, 91128 Palaiseau, France.
j.conlon1@physics.ox.ac.uk, mark.goodsell@desy.de, eran.palti@cpht.polytechnique.fr
Abstract
We calculate the one-loop Yukawa couplings and threshold corrections for supersymmetric local models
of branes at singularities in type IIB string theory. We compute the corrections coming both from
wavefunction and vertex renormalisation. The former comes in the IR from conventional field theory
running and in the UV from threshold corrections that cause it to run from the winding scale associated
to the full Calabi-Yau volume. The vertex correction is naively absent as it appears to correspond
to superpotential renormalisation. However, we find that while the Wilsonian superpotential is not
renormalised there is a physical vertex correction in the 1PI action associated to light particle loops.
Contents
1 Introduction 2
2 CFT Building Blocks 3
2.1 Vertex operators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.2 Bosonic Correlators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.2.1 Internal untwisted quantum correlators . . . . . . . . . . . . . . . . . . . . . . . . 6
2.2.2 Momentum exponential correlators and pole structures . . . . . . . . . . . . . . . . 7
2.3 Fermionic and Ghost Correlators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.4 Partition functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.5 The Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3 Yukawa threshold corrections 11
3.1 General structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.2 3-point amplitude . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3.3 4-point amplitude . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
4 Summary and discussion 28
A Gauge Threshold Corrections 29
B Theta Identities 32
C Determination of Amplitude via Lorentz Structure 33
1 Introduction
Loop corrections to effective actions play an important general role in physics. Supersymmetric theories
are celebrated for their special behaviour at loop level and for the protection of holomorphic properties
against renormalisation. Specifically, the superpotential does not get perturbatively renormalised and the
gauge kinetic function is perturbatively renormalised only at one-loop. The study of one-loop gauge cou-
plings and their threshold corrections has been carried out extensively in both field and string theory. In
this context there is an important distinction between the Wilsonian gauge kinetic function, renormalised
only at one-loop, and the physical coupling, which is corrected at all orders. The study of one-loop
Yukawa couplings in string theory has been less extensive, and the distinction between holomorphic and
physical couplings less clearly drawn. Here holomorphy properties have been taken to imply that Yukawa
couplings only receive one-loop corrections from wavefunction renormalisation.
2
In this paper we study one-loop Yukawa couplings for supersymmetric models of branes at singularities
in type IIB string theory. These models are local in the sense that for much of the calculation the global
compact completion of the internal manifold does not play a role [1]. Previous studies of one-loop Yukawa
couplings in heterotic and type IIA settings have been performed in [2–5]. There are two important
motivations for this work. The first is that the one-loop behaviour of running couplings in local models
is especially interesting with respect to the volume of the full global manifold. For gauge threshold
corrections, studied in [6–8], gauge couplings run to a scale set by the global volume of the manifold,
the so called winding scale, rather than the local string scale. This has important consequences both
practically, as for the case of local GUT models it implies the string scale is an order of magnitude below
the GUT scale, and conceptually, in the sense of understanding the extent to which a local model can
be decoupled from the bulk. It is natural to investigate the same behaviour for Yukawa couplings, where
indeed we find precisely this property, with UV threshold corrections implying that the Yukawas are
renormalised up to the winding scale rather than the naive cutoff, the local string scale.
The second motivation arose during the calculation and involves the distinction between physical
and holomorphic couplings. In [9–11] it was argued that for supersymmetric field theories with massless
particles, in apparent contradiction to the non-renormalisation theorem, it is possible for superpotential
operators to receive finite loop corrections that are not associated to wavefunction renormalisation. In the
case of Yukawa couplings this corresponds to vertex renormalisation. The vertex correction is generated
in the IR by integrating over light loop momenta. While the Wilsonian superpotential - corresponding
to an action at a scale E with light modes yet to be integrated over - is not renormalised, the vertex
correction is a physical feature of the 1PI action. We find that local models of branes at singularities
(and we expect also more general intersecting brane constructions) fall within this class of theories. We
demonstrate explicit one-loop vertex renormalisation from the world-sheet perspective thereby giving, to
our knowledge, the first realisation of this effect in string theory.
The paper is structured as follows. In section 2 we review the basic CFT building blocks that are
needed for the computation. This section establishes notation and convention, as well as reviewing bosonic
and fermionic correlators on the torus and annulus. We also introduce the model that we study throughout
this paper: fractional D3 branes on the C3/Z4 orbifold. Section 3 contains the main calculation. We first
compute the one-loop Yukawas via a 3-point scattering amplitude computation. This demonstrates the
key renormalisation properties of the Yukawas but also contains some ambiguities regarding the off-shell
continuation. We subsequently resolve these by performing a 4-point calculation that reduces to the 3-
point amplitude in a certain limit. We describe the structure of the string diagram and how it generates
both wavefunction and vertex renormalisation. In section 4 we present a summary and discussion of our
results. The appendix contains a warm-up calculation of gauge threshold corrections as well as various
properties of ϑ-functions.
2 CFT Building Blocks
The computation of the amplitudes requires the evaluation of various CFT correlators between world-sheet
fields that are introduced through the vertex operators. In this section we collate the relevant correlators
and also other miscellaneous CFT results that are used. An incomplete list of useful references for
these CFT correlators are [4, 18–26]. All the amplitudes evaluated in this paper are cylinder (annulus)
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