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Craig Har Department The Univer Glasgow U E-mail: J The Re PoS(LATTICE 2007)019 , 2 a y of of er on η el- for are the the are ail- v that v ving v for from QCD man a xpen- of so , small. calcu- lattice lattice lattice de the ] partic- we half ha e 2 ground and mass than McNeile y [2 η focus alidating of be of the ariational Ho with Of v for an v The with been the mass w wing QCD and . the them of e See ith interpolating disconnected will Craig will v second vie . mesons, vie I of mass the W es ) of ha re structure re required viour collaboration MeV part where eloped ++ the a unquenched for discuss the lattice a v . part 0 =2+1 mak by t mass are 4260 f strange constant In In 800 beha ( de there candidates for n for correlators. calculations and for Y ] acuum the first this don’ pseudoscalar and start v inside [3 are I mesons I and and for correlators. decay important the and highly QCD around computation =2 mixing. light and results constant a an In f calculations 0 QCD non-singlet although Also singlet y be n a pion is η QCD. quenched the - understood. mesons an the to e our configurations η quantities lattice disconnected collaboration one the estimate v using QCD X(3872), with is by This olv connected , between fla well as , =2 v ) quantities, lattice mesons. ant pseudoscalar these f are more v between only in of mesons. n qcd ETM include between vy spectrum. y not singlet runs. calculations, than xpected lattice is t such e 2317 rele of ++ caused from who ( hea e, the s mixing 0 our is ] v man y still singlet consistent v be don’ D preliminary 2 the because [1 older ference there be on mesons 2 I lattice calculations model η is formalisms. fla products to are . that from ferences our non-singlet of dif the v The w pseudoscalar on intensi include will the simulation om dif quantities as fla and focus the from our vie QCD lying fr generation ge. quarks of v decay lattice a ork meson re mesons, compute the that means w results spectroscop results thought the lar 2 there w fla that such 2). basic sea lo singlet last are η to longer is this of with mass the lattice are that = collaboration for compute results pseudoscalar of ferent =2 for who the ) scalar freedom 1 in the our w ered of 2 f mesons recent v mesons dif v quarks + η the n The much and of ( vie case out ++ of fla 2 meson mesons . of errors mass suggests found 0 m correlators 0 re possible LHPC with 0 sea 0 for singlet y of results of and η a r disco = light for η the with el is ( plot of the map the v grees noisy the C calculation This of it a ask the P our for le the be summary between omissions de of sub-groups and v J of ]. been w that of ours GeV QCD an η fla fully masses [8 e v statistical not wer more who the the QCD v oscopy is ork sho xperience notation point status 88 ws MeV pseudoscalar fla to . po e arious I w meson the 2 ha the the spectroscop The xperiments are ]. act v mass for will compare η f e ≈ 1 . sho the complication try small [7 of of 600 noisiness spectr 2+1 the 1 ge is the The There In people are lattice that w that to the in the ector this ], is will on starting ]. lar ]. in v or singlet the I vie oduction 5 [4 the figure unquenched of with [4 er results calculations. , use although re at v mostly anomaly hadr computing w states The There In Another I Figure In note [4 talk light intrinsic d ays The Intr meson we e w standard vie w natural v will 2 ular results. 2. the opments lattice the ne re technique the glueball ETMC I a able mass, al lattice a meson η Har 1. axial si mass calculations calculations diagrams, lations operators. were Ho PoS(LATTICE 2007)019 2 is in x- an by η 12 e . The 250 fect me- 0 final (2.2) (2.1) . as 0 ef a the of ∼ η state wed fm. McNeile 2.2 with compute a as of 1 . vie freedom to to arded 0 and re order g Craig < with of η xcited re is e mass matrix a indirectly the meson the the also attempt and by first grees will (compare is ut 1, de mixing b the study 0 + smearing calculation is that recent η This 2 to GeV 0 glue , a ], = ours, η η v pseudoscalar light f [5 , 2 , n ) and to lattice ours. fla s been ! The v 5 a γ ) ) with 0.87(5) ariational ¯ s and fla 0 0 v ( ( ( = 2+1 technique singlet also 2 a S S 2 0 s s = from = quarks η η η = = 24 32 s ) ) f m our ]. has t . ]. f approach η f of 2 ( ( v n = = ) form n n P P n s η , π [10 ]. fla L L [11 49 η η 2 and . to calculations 32 04 m [7 a 4 . . , ) ) ariational √ 0 the with There 6 22 22 5 5 1 0 0 v r . . . terms / with = ( ( ( 3 ) staggered 6 5 5 2006 modern to a S S = = n n 0 d used from in GeV with r 5 η η = = = 0 0 QCD between ed A 2 γ GeV ) ) r r ¯ 0 0 0 v t t η d MeV) r r r ( ( UKQCD CS used formalism fer P P n s were + lattice of A couple η η u dif 548 and QCD QCD at 0.958 5 0.55(2) mesons impro lattice

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