Phil Correspondence with Reuben Freeman
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Handwritten and typed letters between Phil, at the University of Utah, and Reuben Freeman, dated February 1978. They discuss Freeman and Jones papers and the Freeman-Zarmi paper, covering Reggeon amplitudes, Steinmann terms, Mellin projections, kinematic weighting factors and the energy-plane bootstrap. Much of the handwriting is garbled in the OCR, so this description is approximate.
AI-written summary; may contain errors. This description is approximate.
Extracted text (machine-read; may contain errors)
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Reuben Freeman
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Jones/Freeman papers: .
1.“foward‘aGeneralProof...”.ThinkofA;inthisway:pagent»Itlooks @sceanA,amplitude, andyouknowthenharetwoSteinman terms.Inmynotesfor this, the first .FJ paper, Ihave shown how these two Steinman terms are
contained inWeis' forma (2). Ifyou-4re doing some kind ofunitarity calc,
youwantaspartofyourintegration this: SawdiscAgiWt) «Ie,woaresort
offaking things byconsiering this pictgre:
Bynot bothering toReggeize the upper particlés, they keép itsimple. But it
isnot clear tomethat you réally want |the integral quoteds Accepting that you
dow,nt this quanityt, youcanexpand A,interms oftwo 2/reggeon/2-particle
amplitudes, ofie for each Steinman term, |These Q's are each normal analytic in
x,butforfixed 5,5, sayaremitiplida bycertéin (-u?)"** factors which
cause kinematic cuts intheM@-plane. ‘Thus, inanyintegrals youencounter,
theyclaim thatyourM°integrals ofrefgeon amplitudes willalways beweighted
bysuch kinematic factors, This perhaps jeads toasymmetric projections. Whg dont
Iencounter these things inmymethod?
e@2."Gribtria forgoodFNSR..". Heretheydoitagain,consider Agusingslightly
@ifferent notation with V)and¥,Steingm terms. Mynotes there summarize it
well. Again youwant aFHintegral ofdisc Ag;youwrite outthetwoterms; the
left hand cut thing has to go away to ge} cut killing. Remember that when theFMintegralovsomethinggivesyouonly[2powers,theMellinprojectionof that something has nonsense-geros. Still Iamnot very clear on how to cannect
thisstufftome. |
3.“Cancellatiom of.." Third paper ofthe sequence. Here they are finally
considering the4-reggeonringctcetint ofFig.2.Youareclearlygoing tohave some kind ofKMintegral aspartlof your unitarity phase space. Tmt
integration appearss in(2.1). Again, daseethatyour4-reggeon amplitude
is weighted by acertain factor. This ig that problematic asymmetrizing factor.
Comments: none ofthese 3papers makes mention ofMellin projections. They
are doing energy~plane bootstrap, soall|they care about isfinite mass integrals
inu°, ButnowIwill golook atF2vanal? papers.
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| 4.Freeman andZarmi: HereIsuddenly gettheideathatthe"weighting" factor
apises from the asymmetric NDC. I-can see this arise inmyown rapidity notesattheend.oftheFZpaper.ThatiswhyIwouldsay:assymetric projetion cane
from asymmetric NDC. Bythe way, the three FJpapers never actually doa
dootetrap, but refer toFZand P2V.
Idea: canperhaps identify theweight factor with threshold factor?
5.F2V: they show onpage 8that, when you write aMellin projection of
Diso&g (with noweight), andwhen youhold sands,fixed, that weight factor
maginally appears. Itisofcourse caused bytheform ofthelimit ofAg
interms ofAL. Ie,thelimit given in(2.5). There ,youseethat x
A(amplitude with noprime) isanalytic inN°butyoupick upextra
or) factor from theregge behaviors. This seems tobetrue without
a@list of Steinamn terms,
Then Iguess the question becomes: whg doyou want to integrate
Agrather than App directly?.
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eoGlaim:whenIstartwiththeClL.inReubenspaper,Iamabple tosuccessfully diagonalize jthething atthecost ofhavingtouse"asymmetric" Mellinreson Theseprojectionsthenhavenonsense zeros which correspond + Reutens "Good FMSR". Thus, I
amable tocast theClequation into theusual diagonal-j form, but
at aprice.
However, inmyexact kinematic analysis, Iamagain able toexactly
diagonalize onto j;morover, the rojections involved here are .
perfectly symmetric. Ihave made nt“high energy approximation".
Reuben would say, regarding hisanblysis: look, ifyouwant toproperly
take account ofthe low-energy behavior ofamplitudes, you cannot use
thehigh-energy Mellin approximatibn, identifying 8,withsf.Ifyou
dothis andthereby avoid using my|FNSR, youwill getthewrong andwer
for your Cl tern,
Reuben wouldgoontosay:look,myPHSRarebasedonstrict observation
, ofanagyticity; when Iexamine analyticity, Ifind noconstant terms ine theFMSRandtherefore Iwillhavejcut-killing.
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ResponsertoReubenFreeman'sLetterofMarch|
6.Hesaysthatifyougothrogehacertainaesandthenshiftthej'contourtothe right, you get aresult which isequivalent fothe dlagonalized-equation result.
Whereas ifyou shift the contour tothe left, you get adifferent result.
Hethen gives alittle example and shows hbw the two shifts give different
results.
Myresponse isthis: itiscorrect toshift to|the right. Reason: the projection
intheJ*integrand isexpo decaying intherigh} half j'-plane, sooneyoupick upthe
pole atj'=J, there are nomore singularities| out there and you the residual contour
then vanishes. Thus, the diagonalized equation 4scorrect.
Ifyou shift the contour tothe left, and|pick uponly the first regge pole and
thenignorethebackgroundcontour,[email protected]:justlookatyour ownexample, Youassumed aspecific projection withanonsense zero ina atJ=\y.Inyourresult shifting totheright, thannonsofse-zero isfeithfully reproduced on
both sides ofthe equation; ifyou shift tothe/left, thab nonsense zero only appears
onthe left but not onthe right.
Ifyou were tocontinued toshift the contéur tothe left and pick upall the
lower regge pole contributions, you would eventuglly regenerate that nonsense zero.
@ Ofcourseinpractice eithermethodisOK.|Ie,thetwoexpressions yougive
agreewhenjisnear4. i
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Ou. yt AyskCaleg ath <aAgd=S38) SHE) VE).96)4.50Abode) «
|MW.QuonsodwRwily
| q=WyG9"VEDge (8) e
[a~ve}
QeiaDaunlercrmen Oamartin leootodeg. Creeding aaddayne
Ero umd)JdraccderallCiaSaNode?JKRWateOwaaey/DadDebt,WHtobegoagen: Yokamesak
VG) =StsUG\VOr8).
Qosqretbion ae e
Aisa=SitSas." {eadecsh
\
*SassosAs)‘Ges)Po (SasSSa)
\
AG=4-452) pM Mae AG=te-tes-t)
pry
oles ~T=y-t Auli)= Sissi“A,Co.s2)| (5) e
* ~jree
onaslgrourda-e) =Sis,[ENA Ce)
ee
|
e ;
SD rr eS
j =\~%-1. SS
~\7v eet] ha(raed)=Si5,(55ipArs(ss)(
> agit |\ .
{ry AwGd\ =am WayGs)Aes)
Windateaotagen withator | ages
@sO)=Yas,c5°" ForTaf
Que aca
Qa bwth DA v=dat) osar
\x;Vota fy sry oy Aas(i~ae-)
QuinOrenaaaDewarledsdeOx.VoyWeapomstia wheasymoan! j
—_ 4 i AGe)=SonSd.wey'}(oarsqesyy . e °;
hed roksst ekeakan ~ \ ( >xSaskGe)&Ga~wbaGs)Res(Meet) :
| Qaea Bam doGes3:
»ass©(Seg~SaSs) (ss)“e
eh deni .
Jdantune:(ree
e
AGe)SWJaca osie-snt C>)Pawdems
jindee
RokQubevanQamonarneryercdunfstOho e
Aba)=aTYass PMOL (sayPt
Sdss
Sus, we| \ \'oeea (SsjeeSedhugh \ds,-(s3) =(Sef) Gee) jio%e
Uw +f “T er
-3- |
- 4
1
° 1
iSa ~v-\(oot 6as S)= SyGS Ss 3m Sy ®23) DASGs) a4
> "3 .at we OMIRalyeden) =345m SSabepo Sp
Ark
a
po Gd
7 ot Ok,=aheftDee!embomSaftfogh ;
2
AGa)=Sar Qase {C3
¥
ah hnA~ tardye An!shGufr) re)A Gt
Fades Kege%
a= 9.fsGs)
p 11
What has been done tothis point? Reuben has tektn abootstrap equation with the left
cluster deltad atsome fixed mass, hence nocounting problem. Hethen takes the largeSpqlimitofbothsidesandrequireses thattheypeconsistent. Assuming thenonsensezétoorFSRorwhatever youwanttocallit,he4abletogetconsistency withacertainboostrap condition. Fine.
Then, hetries toredothesamething byfirst expanding theobject ACs) ontoitsMellin projections, and then heexecutes the s,i#tegral. Finally, heclose§°the Jcontourandtakesthelarge 85,limit. Thisprecudee léaddtothesamelittle bootstrap condition.Thus, hehasshofm thatifyouaredoing sodething asymptotic,you canfreely expand
onto Mellin projections, doyour energy integral, jthen close your contour and regain the
same little vertex bootstrap.
Sofarsogood.Nocontradictions claimed ofnbticed byme.ItisOKforhimto @etine nis om Neliin projection however hewished.
{
{
~ BerAHe~ AGesy= SarVG)GS Gag
Yas (sy?"AG,2)
Se
Anygoeleue Sdsa(seyee -\
iss BRSSss(32)ere Gu)
WecadeVeRCyeeeseg2)dehcewrensrodenndwily Diesodinardeben Nerhile »§ndlgeA4bah AQ). Se
aus=7OWLvadoadhaespudbong). e
“Bwsiet. Qtek
det “ \oaee AGs)=San,GO"V6) SSagaGeoGre)
4Ses)Mereotes ah 37he
J . |
AKA K+ iret)2S88 ie\ sot eGay yowilee
~)fey2bay
i
{
a) apt N seu!Ko-ordone) =YD VEeeGayhesGio1)
» toxf
Qi) Ved
wo>
a Cnasdpoe6
Cet 4ok SoAly-dysdee2) =SMecA){(Ss)+ieh™6*
e *SD(R%) SseenttceeFOCBaldpe
Myrepatabotiaadstheag,fea, .
Aordendgnt) =SA|CE vehey|3k[AsGao
=DarenalsaepSoge)anal
°
|
1 a, os
\ VS
s
Acondensation ofReubens letter.
=I @1.First,rotscotao1=8,5=,andletsgetridofthetransverse integration, putinV=some constant fof thé*potential. Then the Yootstrap equation becomes: Sz=S.
Sy=S.
a A@= tS. Sts,AC) :
( '
2.Nowletusassumethattherede@nonsense“asfollows:o oo
oe ‘yas,AGO=o.Thaw,Ach-\s®\aAse)(*)
Nowassume these asymptotic limits: !
x '. AG)=aqS\ YamaeySoke,==L &—ez
. AG)=gq,S. Jamis Oeysn;ka#-\
. 4 C4Xe, Xen >ams- -Vs" \ae.Lands§|
e S | ColomFEQa8a. Ss) x!)
@&~ee)
»yeste, |
Ca~ae) {
Thisthenistheresultantbootstrapcondition,tsequation(6). :3.Nowletssimulate Reuben's secondmove,whichj8this:expandA(s,)inequation (*)above:
,ek .
y= eriPA |Pee=! AG@\= arda’Gd AG‘he-1)
‘ \ To» Waymacklencamp, alo2 Ase)=BaYayv@dAG).
eeol Vow Qa:AG)=-¥sSas.3Saves AG) ®s
2
; a~ =--Ys* aye AG).Vase6) T+isone Cs)
. Trl
Wak,sighdo|sveee AGL)>AGHbeeped yeas
of: : yeah eke RO AG)=~Vs"™AchyAG+4a-!) G)odQe)
YorsthSaf.ShadeOok:
Pe a) ASG~| ~~)Nal 2 RQta)=Sd.Ge)“K923e)
ay Oe
x\y Se)2 .
voa)
> é KAass AG)=3? =4Vs™ pyC
(a=e) e=twSang\oohsivg.
Now finally wecome toReubens third move. Westart with equation (**) above and
project the whole damn thing: what happens? How doyou deal with the two contours
Jjandj',ie,where arethese variables relative toeach other? Atthemoment, the
J*contour lies tothe right oftheleading singularity inA(s5). Maybe Ishouldbemoreexact about this. Thecontour mustbetotheright of}=alpha, because
that isthe leading pote inthe. projection shown inthe equation .Now weare
allowed toproject with some very large positive jtogetgood convergence. Thust
.
o .:
.
AySés3"AG) =AG)5°
‘
eS ‘ at
; Senn Ag=VAP)gtKatee)Suhoe- Y
gees A
VWs
\Kot *®. >AO=Y¥aha Al\rekee1) @xr¥).
Gide) ({!-
~a-
Sundlsary agracontrobaesotlasBBD]LNs.So
AQ) = ce y 5
& (AY
=Voy _? lve WASarleortshe,
(e-HeeyeyS) ire)
Iwould never close thisthing totheright; Reujen merely points outthatifyoudoso,
you get anequation which looks tohim like the diagonalized Mellin equation that Ipropoung
0vehenently. Nemely:
AG)=AG8) |
G-4e) |
Hethen arrives atthis conclusion: since this result disagrees with the result you get
bydoing directs integrations, itmust bewrongj} and since this result looks like my
iagonalized equation, mydiagonalized equatiors must bewrong.
Qrovever, Iwouldclaimthatinthissituation thpdiagonalized equation iswrong. But‘that isonly because his boostrap equation iswrong. Ifhehad the right bootstrap, IthinkitwouldMellindiagonalizeinthiswry.iioks !e Aay=Fey"YasAe
Ithink the fact isthat this thing isnot aconvplution equation, and therefore itwill
Hot diagonalize inthe “trivial "way. lets see whathappens:
2
aS ABS=VO) --ds,ACs2)882)e INS gy a: ~ ~-\ 2~s-\ . Yas00)=AG=Sas,fdJasO°) \ y <a A Sh
(die
o 4 a-y -=\) de=TSas,65°M6)«SSANsSS)
e ail2) ' ——
iad(Sa) oe\ = AG: yao,
Corvesfeseneah
Reuben Freeman
Phil. Lucht
|