rob verheyen - peter skands
TRANSCRIPT
QED and EW showers in VinciaRob Verheyen
Ronald Kleiss, Peter Skands, Helen BrooksKleiss, RV 1709.04485Skands, RV 2002.04939Kleiss, RV 2002.09248Brooks, Skands, RV 2108.10786
One-slide Vincia summary1. Phase space factorisation
2. Ordering scale: Ariadne
3. Branching kernel: Antenna functions
p2⊥
d�ps =1
16⇡2�
12 (m2
IK ,m2I ,m
2K) dsij dsjk
d'
2⇡
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sab = 2pa·pb
<latexit sha1_base64="aoH63lSVFTgtuWQ4w6TGvpCjWyA=">AAACGHicbZDLSgMxFIYz9VbrbdSdboKl4KrMlIpuhKIblxXsBdphyGTSNjSTDElGKMOAz+EDuNVHcCdu3fkEvoZpOwvbeiDw8f85nHP+IGZUacf5tgpr6xubW8Xt0s7u3v6BfXjUViKRmLSwYEJ2A6QIo5y0NNWMdGNJUBQw0gnGt1O/80ikooI/6ElMvAgNOR1QjLSRfPtE+SkKMngNazD2EUz7OBQ6Mxz4dtmpOrOCq+DmUAZ5NX37px8KnESEa8yQUj3XibWXIqkpZiQr9RNFYoTHaEh6BjmKiPLS2Q0ZrBglhAMhzeMaztS/HSmKlJpEZtVKhPRILXtT8T+vl+jBlZdSHieacDwfNEgY1AJOA4EhlQRrNjGAsKRmV4hHSCKsTWwLU5Q5akTCrGSScZdzWIV2rerWqxf39XLjJs+oCE7BGTgHLrgEDXAHmqAFMHgCL+AVvFnP1rv1YX3OvxasvOcYLJT19QveT5+L</latexit>
m2ab = (pa + pb)
2
<latexit sha1_base64="vrZgzBTEaH7bnS0gKlCIW6H8sus=">AAACFHicbVDLSsNAFJ3UV62vqODGzWARKkJJSkU3QtGNywr2AW0aJpNpO3QmCTMTocT8hh/gVj/Bnbh17xf4G07bLGzrgQuHc+7l3nu8iFGpLOvbyK2srq1v5DcLW9s7u3vm/kFThrHApIFDFoq2hyRhNCANRRUj7UgQxD1GWt7oduK3HomQNAwe1DgiDkeDgPYpRkpLrnnE3QR5aa8Cr2EpctF55HpnvYprFq2yNQVcJnZGiiBD3TV/un6IY04ChRmSsmNbkXISJBTFjKSFbixJhPAIDUhH0wBxIp1ken8KT7Xiw34odAUKTtW/EwniUo65pzs5UkO56E3E/7xOrPpXTkKDKFYkwLNF/ZhBFcJJGNCngmDFxpogLKi+FeIhEggrHdncFqmfGhI/Lehk7MUclkmzUrar5Yv7arF2k2WUB8fgBJSADS5BDdyBOmgADJ7AC3gFb8az8W58GJ+z1pyRzRyCORhfvwC3nWk=</latexit>
p2? =sijsjksIK
<latexit sha1_base64="NCHSfMGw4hP1tJmNFjwfufBAPhI=">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</latexit>
pI
pK
pi
pk
pj
→
aqq(sij , sjk) = 4⇡↵sCF
2
siksijsjk
� 2m2
i
s2ij� 2
m2k
s2jk+
1
sIK
✓sijsjk
+sjksij
◆!
<latexit sha1_base64="Ar6ZsfFijFvCAOTsy7psD7iroyk=">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</latexit>
Coherent Photon Radiation
aQED({p}, pj) = �X
{x,y}
�xQx�yQyaQEDff
(sxj , syj)
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Single branching kernel
Soft limit
Collinear limit|Mn+1(p1, .., pi, .., pn, pj)|2 = 4⇡↵Q2
i2
sijPI!ij(z)|Mn+1(p1, .., pi + pj , .., pn)|2
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|Mn+1({p}, pj)|2 = �8⇡↵X
x,y
�xQx�yQysxy
sxjsyj|Mn({p}|2
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Sectorize the phase space
|Mn+1({p}, pj)|2 = aQED({p}, pj)X
{x,y}
⇥(p2?,xy)|Mn({p}xy)|2
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p2?,xy
<latexit sha1_base64="iF7xmKEBrR/mzGhzUCCwdEc0cpA=">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</latexit>
is the smallest of all p2?
<latexit sha1_base64="YQRfPznNtbc2Auhy1qEVylNEgPM=">AAACYHicdVBNTxsxFHS2tA2BFkJvcLGIkDgluxGIqpei9sIRJAJISYjeOi8bK17bst9Wilb5Gb3S39UrvwQnBInwMZKl0cx7z6NJrZKe4vh/Jfqw9vHT5+p6bWPzy9et7frOlTeFE9gRRhl3k4JHJTV2SJLCG+sQ8lThdTr5Pfev/6Dz0uhLmlrs55BpOZICKEhde9selD2Lzs4G2424GS/AX5NkSRpsifNBvfKzNzSiyFGTUOB9N4kt9UtwJIXCWa1XeLQgJpBhN1ANOfp+ucg84wdBGfKRceFp4gv1+UYJuffTPA2TOdDYv/Tm4ltet6DR934ptS0ItXj8aFQoTobPC+BD6VCQmgYCwsmQlYsxOBAUalq5pEAPvYBQWpmhyZHcdHbAx0T2R6slCHTTuKxlJ1nryV4N6Ry8t7DwaqHy5GXBr8lVu5kcNY8vjhqnv5blV9ke22eHLGEn7JSdsXPWYYIZ9pfdsX+V+6gabUX1x9Gostz5xlYQ7T4AOoy4DA==</latexit>
x, y
<latexit sha1_base64="cJA9e5GsRxup15Huh4/YsrlToPM=">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</latexit>
does the emission
High-mass Drell-YanVincia (Coherent)Vincia (Pairing)PythiaFixed Order
0
0.0001
0.0002
0.0003
0.0004
uu → Z/γ∗→ e+e−γ (Dressed, no QCD, p⊥,γ < 5 GeV)
dσ
/d
cos(
θ∗ CS)
[pb
]
-1 -0.5 0 0.5 10.50.60.70.80.9
11.11.21.31.4
cos(θ∗CS)
Rat
io
Vincia (Coherent)Vincia (Pairing)Pythia
0
0.0001
0.0002
0.0003
0.0004
0.0005
0.0006
pp → Z/γ∗→ e+e−γ (Dressed)
dσ
/d
cos(
θ∗ CS)
[pb
]
-1 -0.5 0 0.5 10.50.60.70.80.9
11.11.21.31.4
cos(θ∗CS)
Rat
io
EW Showers +1
−1
−1−1
+1+1
−1
−1
+1
+1
•Chiral Helicity showers Larkoski, Lopez-Villarejo, Skands 1301.0933Fischer, Lifson, Stands, 1708.01736
•EW-scale mass corrections
•Longitudinal polarisations / Goldstone bosons
•Neutral boson interference
•Double-counting between QCD and EW
•Resonance-like branchings
✏µ0 (p) =1
m
✓pµ � m2
p·kkµ
◆
<latexit sha1_base64="dUb7y776bOdqfxzWtfnM4JSsspw=">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</latexit>
pij,λij
pi,λi
pj, 0
pij,λij
pi,λi
pj, 0
pI ,�I
<latexit sha1_base64="NfoDnGVH276G93ss6tTJ02aVt/s=">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</latexit>
pI ,�I
<latexit sha1_base64="NfoDnGVH276G93ss6tTJ02aVt/s=">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</latexit>
Features of the EW sector
• Real corrections: EW gauge bosons, tops, Higgs part of jets
• Virtual corrections: Universal incorporation of Sudakov logs ↵
⇡ln2
�s/Q2
EW
�
<latexit sha1_base64="RRDtywkKUrSoZX9yylg1rTwot6c=">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</latexit>
Collinear Limits
P (z) / m2
(m2ij �m2
I)2
<latexit sha1_base64="W+bDG/XtbRHf/WmOcfFNSki+3MQ=">AAACFnicbZDLTsJAFIaneEO8oS7dTCQmsIC0BKNLohvdYSKXBEozHaYwMtM2M1MTbPoUbnwVNy40xq1x59s4QBcK/skkf/5zTs6czw0Zlco0v43Myura+kZ2M7e1vbO7l98/aMkgEpg0ccAC0XGRJIz6pKmoYqQTCoK4y0jbHV9O6+17IiQN/Fs1CYnN0dCnHsVI6cjJlxvFhxLshSIIVQB7nkA45v1qEhe5E9O7pF+FZcid6361pFMnXzAr5kxw2VipKYBUDSf/1RsEOOLEV5ghKbuWGSo7RkJRzEiS60WShAiP0ZB0tfURJ9KOZ2cl8EQnA+gFQj9fwVn6eyJGXMoJd3UnR2okF2vT8L9aN1LeuR1TP4wU8fF8kRcxqAlMGcEBFQQrNtEGYUH1XyEeIY1GaZI5DcFaPHnZtKoVq1Y5vakV6hcpjiw4AsegCCxwBurgCjRAE2DwCJ7BK3gznowX4934mLdmjHTmEPyR8fkDrgKdzw==</latexit>
P (z) /m2
ij
(m2ij �m2
I)2(1� z)
<latexit sha1_base64="CjFl5BQEku68RlFsW30dVaj/5G8=">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</latexit>
�I �i �j f ! f 0V
� � � 2(v � �a)2m2
ij
(m2ij�m2
I)2
11�z
� � �� 2(v � �a)2m2
ij
(m2ij�m2
I)2
z2
1�z
� �� � 2 1(m2
ij�m2I)
2
⇣mI(v � �a)
pz �mi(v + �a) 1p
z
⌘2
� �� �� 0
� � 0 1(m2
ij�m2I)
2
(v � �a)
⇣m2
Imj
pz � m2
imj
1pz� 2mj
pz
1�z
⌘+ (v + �a)mimI
mj
1�zpz
�2
� �� 0m2
ij
(m2ij�m2
I)2 (1� z)
⇣mimj
(v � �a)� mImj
(v + �a)⌘2
<latexit sha1_base64="jQNtVoKxD8P46MDIha0hMvS1jB4=">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</latexit>
P (z) /m2
ij
(m2ij �m2
I)2
1 + z2
1� z
<latexit sha1_base64="Uc98VkiFjWSUQpQKgfSL3ffFW/Q=">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</latexit>
m2ij = m2
ij �m2
i
z2�
m2j
(1� z)2
<latexit sha1_base64="4F/JrEnf1D5p7CmmLsOouu+W5Og=">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</latexit>
Pure vector
Pure vector
Vector + Scalar
Pure scalar
Overestimate Determination types of branchings (all FSR + ffV ISR)O(1000)
<latexit sha1_base64="ZVcQl9Bvwxfdv81CVC/QmmFO/fo=">AAACD3icbVBLTsMwFHTKr5RfCks2FhVS2VQOKoJlBRt2FIl+pDaqHMdprTpOZDugKuohOABbOAI7xJYjcAKugdNmQVtGsjSaeU9vPF7MmdIIfVuFtfWNza3idmlnd2//wC4ftlWUSEJbJOKR7HpYUc4EbWmmOe3GkuLQ47TjjW8yv/NIpWKReNCTmLohHgoWMIK1kQZ2uR9iPSKYp3fTqoMQOhvYFVRDM8BV4uSkAnI0B/ZP349IElKhCcdK9RwUazfFUjPC6bTUTxSNMRnjIe0ZKnBIlZvOok/hqVF8GETSPKHhTP27keJQqUnomcksqFr2MvE/r5fo4MpNmYgTTQWZHwoSDnUEsx6gzyQlmk8MwUQykxWSEZaYaNPWwhVlPjWi/rRkmnGWe1gl7fOaU69d3Ncrjeu8oyI4BiegChxwCRrgFjRBCxDwBF7AK3iznq1368P6nI8WrHznCCzA+voF3HWbxQ==</latexit>
aFFtrial =1
m2ij �m2
I
cFF1 + cFF2
1
z+ cFF3
1
1� z+ cFF4
m2I
m2ij �m2
I
�
<latexit sha1_base64="vOE6lgsx9D6QNndyozo4KGA4jCI=">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</latexit>
Parameterized overestimate
For every branching:
• Generate random branchings in random antennae• Set up linear programming system• Solve numerically
Efficient veto algorithm
Minimize aFFtrial,i � aFFi
<latexit sha1_base64="AYL1owBnN+1zX7VAOiOqq0C3GaI=">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</latexit>
While 8i : aFFtrial,i > aFFi
<latexit sha1_base64="Z7/fVC53Yl61seMXWHl9V/pA8TY=">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</latexit>
Virtual Sudakov logs
10�10
10�8
10�6
10�4
10�2
d�/d
p ?,Z
[pb/G
eV]
Fid. cuts: 65 GeV < mZ < 115 GeV
p?,l > 25 GeV, |⌘l| < 3.5
pp ! ZZ ! e+e�µ+µ� (14 TeV)
Vincia (MC)Vincia + EW (MC)Vincia (fid.)Vincia + EW (fid.)
10�10
10�8
10�6
10�4
10�2
pp ! ZZ ! e+e�µ+µ� (100 TeV)
0.5
1.0
Rat
io(M
C)
0.5
1.0
102 103
p?,Z [GeV]
0.5
1.0
Rat
io(fi
d.)
102 103 104
p?,Z [GeV]
0.5
1.0
Dark Matter Decay Spectra
10�4 10�3 10�2 10�1
x = 2E/m�
10�5
10�4
10�3
10�2
x2dN
/dx
m� = 200TeV
Bauer, Rodd, WebberPythia EWVincia EW
10�4 10�3 10�2 10�1
x = 2E/m�
10�6
10�5
10�4
10�3
10�2
10�1
100
x2dN
/dx
S = �S = p+
S = e�
S = ⌫⌧
� ! ⌫e⌫e ! S Bauer, Rodd, Webber 2007.15001Comparison with analytic results
Neutral Boson InterferenceInterference between and�, ZT
<latexit sha1_base64="LuycDPs/6ciDVKr+psW8rG7eTVA=">AAAB8nicbVBNSwMxEJ2tX7V+VT16CRbBg5Rdqeix6MVjhX7hdinZNNuGJtklyQpl6c/w4kERr/4ab/4b03YP2vpg4PHeDDPzwoQzbVz32ymsrW9sbhW3Szu7e/sH5cOjto5TRWiLxDxW3RBrypmkLcMMp91EUSxCTjvh+G7md56o0iyWTTNJaCDwULKIEWys5PeGWAh8gR77zX654lbdOdAq8XJSgRyNfvmrN4hJKqg0hGOtfc9NTJBhZRjhdFrqpZommIzxkPqWSiyoDrL5yVN0ZpUBimJlSxo0V39PZFhoPRGh7RTYjPSyNxP/8/zURDdBxmSSGirJYlGUcmRiNPsfDZiixPCJJZgoZm9FZIQVJsamVLIheMsvr5L2ZdWrVa8eapX6bR5HEU7gFM7Bg2uowz00oAUEYniGV3hzjPPivDsfi9aCk88cwx84nz9bTJCo</latexit>
h, ZL
<latexit sha1_base64="GqFS8bnR4Hx7JseV9QJxFskocQA=">AAAB7XicbVA9SwNBEJ2LXzF+RS1tFoNgIeFOErQM2lhYRDAfmBxhb7OXrNnbPXb3hHDkP9hYKGLr/7Hz37hJrtDEBwOP92aYmRfEnGnjut9ObmV1bX0jv1nY2t7Z3SvuHzS1TBShDSK5VO0Aa8qZoA3DDKftWFEcBZy2gtH11G89UaWZFPdmHFM/wgPBQkawsVJzeIYeere9YsktuzOgZeJlpAQZ6r3iV7cvSRJRYQjHWnc8NzZ+ipVhhNNJoZtoGmMywgPasVTgiGo/nV07QSdW6aNQKlvCoJn6eyLFkdbjKLCdETZDvehNxf+8TmLCSz9lIk4MFWS+KEw4MhJNX0d9pigxfGwJJorZWxEZYoWJsQEVbAje4svLpHle9irl6l2lVLvK4sjDERzDKXhwATW4gTo0gMAjPMMrvDnSeXHenY95a87JZg7hD5zPH4w1jnc=</latexit>
Shower approximationPhysical contribution
+
<latexit sha1_base64="3DnS3vImeIO9jz1IyYjxDR65oEU=">AAAB6HicbVDLSgNBEOyNrxhfUY9eBoMgCGFXInoMevGYgHlAsoTZSW8yZnZ2mZkVQsgXePGgiFc/yZt/4yTZgyYWNBRV3XR3BYng2rjut5NbW9/Y3MpvF3Z29/YPiodHTR2nimGDxSJW7YBqFFxiw3AjsJ0opFEgsBWM7mZ+6wmV5rF8MOME/YgOJA85o8ZK9YteseSW3TnIKvEyUoIMtV7xq9uPWRqhNExQrTuemxh/QpXhTOC00E01JpSN6AA7lkoaofYn80On5MwqfRLGypY0ZK7+npjQSOtxFNjOiJqhXvZm4n9eJzXhjT/hMkkNSrZYFKaCmJjMviZ9rpAZMbaEMsXtrYQNqaLM2GwKNgRv+eVV0rwse5XyVb1Sqt5mceThBE7hHDy4hircQw0awADhGV7hzXl0Xpx352PRmnOymWP4A+fzB3QdjLc=</latexit>
2
<latexit sha1_base64="KABtTuE2bHd1XLi8DfYY+6Pgzgs=">AAAB6HicbVDLTgJBEOzFF+IL9ehlIjHxRHYJRo9ELx4hkUcCGzI79MLI7OxmZtaEEL7AiweN8eonefNvHGAPClbSSaWqO91dQSK4Nq777eQ2Nre2d/K7hb39g8Oj4vFJS8epYthksYhVJ6AaBZfYNNwI7CQKaRQIbAfju7nffkKleSwfzCRBP6JDyUPOqLFSo9IvltyyuwBZJ15GSpCh3i9+9QYxSyOUhgmqdddzE+NPqTKcCZwVeqnGhLIxHWLXUkkj1P50ceiMXFhlQMJY2ZKGLNTfE1MaaT2JAtsZUTPSq95c/M/rpia88adcJqlByZaLwlQQE5P512TAFTIjJpZQpri9lbARVZQZm03BhuCtvrxOWpWyVy1fNaql2m0WRx7O4BwuwYNrqME91KEJDBCe4RXenEfnxXl3PpatOSebOYU/cD5/AH65jL4=</latexit>
• Complicated solution: Evolve density matrices
w =
<latexit sha1_base64="9EksubjQUKTLwZsYb69m8SFoIZg=">AAAB63icbVBNSwMxEJ2tX7V+VT16CRbBU9mVFr0IRS8eK9gPaJeSTbNtaJJdkqxSlv4FLx4U8eof8ua/MdvuQVsfDDzem2FmXhBzpo3rfjuFtfWNza3idmlnd2//oHx41NZRoghtkYhHqhtgTTmTtGWY4bQbK4pFwGknmNxmfueRKs0i+WCmMfUFHkkWMoJNJj2hazQoV9yqOwdaJV5OKpCjOSh/9YcRSQSVhnCsdc9zY+OnWBlGOJ2V+ommMSYTPKI9SyUWVPvp/NYZOrPKEIWRsiUNmqu/J1IstJ6KwHYKbMZ62cvE/7xeYsIrP2UyTgyVZLEoTDgyEcoeR0OmKDF8agkmitlbERljhYmx8ZRsCN7yy6ukfVH1atX6fa3SuMnjKMIJnMI5eHAJDbiDJrSAwBie4RXeHOG8OO/Ox6K14OQzx/AHzucPFXONng==</latexit>
• Simple solution: Apply event weight
→
→
Very computationally expensive
Does not get Sudakov right
γ ZTγ
2
<latexit sha1_base64="KABtTuE2bHd1XLi8DfYY+6Pgzgs=">AAAB6HicbVDLTgJBEOzFF+IL9ehlIjHxRHYJRo9ELx4hkUcCGzI79MLI7OxmZtaEEL7AiweN8eonefNvHGAPClbSSaWqO91dQSK4Nq777eQ2Nre2d/K7hb39g8Oj4vFJS8epYthksYhVJ6AaBZfYNNwI7CQKaRQIbAfju7nffkKleSwfzCRBP6JDyUPOqLFSo9IvltyyuwBZJ15GSpCh3i9+9QYxSyOUhgmqdddzE+NPqTKcCZwVeqnGhLIxHWLXUkkj1P50ceiMXFhlQMJY2ZKGLNTfE1MaaT2JAtsZUTPSq95c/M/rpia88adcJqlByZaLwlQQE5P512TAFTIjJpZQpri9lbARVZQZm03BhuCtvrxOWpWyVy1fNaql2m0WRx7O4BwuwYNrqME91KEJDBCe4RXenEfnxXl3PpatOSebOYU/cD5/AH65jL4=</latexit>
2
<latexit sha1_base64="KABtTuE2bHd1XLi8DfYY+6Pgzgs=">AAAB6HicbVDLTgJBEOzFF+IL9ehlIjHxRHYJRo9ELx4hkUcCGzI79MLI7OxmZtaEEL7AiweN8eonefNvHGAPClbSSaWqO91dQSK4Nq777eQ2Nre2d/K7hb39g8Oj4vFJS8epYthksYhVJ6AaBZfYNNwI7CQKaRQIbAfju7nffkKleSwfzCRBP6JDyUPOqLFSo9IvltyyuwBZJ15GSpCh3i9+9QYxSyOUhgmqdddzE+NPqTKcCZwVeqnGhLIxHWLXUkkj1P50ceiMXFhlQMJY2ZKGLNTfE1MaaT2JAtsZUTPSq95c/M/rpia88adcJqlByZaLwlQQE5P512TAFTIjJpZQpri9lbARVZQZm03BhuCtvrxOWpWyVy1fNaql2m0WRx7O4BwuwYNrqME91KEJDBCe4RXenEfnxXl3PpatOSebOYU/cD5/AH65jL4=</latexit>
ZT
2
<latexit sha1_base64="KABtTuE2bHd1XLi8DfYY+6Pgzgs=">AAAB6HicbVDLTgJBEOzFF+IL9ehlIjHxRHYJRo9ELx4hkUcCGzI79MLI7OxmZtaEEL7AiweN8eonefNvHGAPClbSSaWqO91dQSK4Nq777eQ2Nre2d/K7hb39g8Oj4vFJS8epYthksYhVJ6AaBZfYNNwI7CQKaRQIbAfju7nffkKleSwfzCRBP6JDyUPOqLFSo9IvltyyuwBZJ15GSpCh3i9+9QYxSyOUhgmqdddzE+NPqTKcCZwVeqnGhLIxHWLXUkkj1P50ceiMXFhlQMJY2ZKGLNTfE1MaaT2JAtsZUTPSq95c/M/rpia88adcJqlByZaLwlQQE5P512TAFTIjJpZQpri9lbARVZQZm03BhuCtvrxOWpWyVy1fNaql2m0WRx7O4BwuwYNrqME91KEJDBCe4RXenEfnxXl3PpatOSebOYU/cD5/AH65jL4=</latexit>
2
<latexit sha1_base64="KABtTuE2bHd1XLi8DfYY+6Pgzgs=">AAAB6HicbVDLTgJBEOzFF+IL9ehlIjHxRHYJRo9ELx4hkUcCGzI79MLI7OxmZtaEEL7AiweN8eonefNvHGAPClbSSaWqO91dQSK4Nq777eQ2Nre2d/K7hb39g8Oj4vFJS8epYthksYhVJ6AaBZfYNNwI7CQKaRQIbAfju7nffkKleSwfzCRBP6JDyUPOqLFSo9IvltyyuwBZJ15GSpCh3i9+9QYxSyOUhgmqdddzE+NPqTKcCZwVeqnGhLIxHWLXUkkj1P50ceiMXFhlQMJY2ZKGLNTfE1MaaT2JAtsZUTPSq95c/M/rpia88adcJqlByZaLwlQQE5P512TAFTIjJpZQpri9lbARVZQZm03BhuCtvrxOWpWyVy1fNaql2m0WRx7O4BwuwYNrqME91KEJDBCe4RXenEfnxXl3PpatOSebOYU/cD5/AH65jL4=</latexit>
⇥
<latexit sha1_base64="DFN4sfNhBNG+B7awRb3y/Saos6c=">AAAB7XicbVBNS8NAEJ3Ur1q/qh69LBbBU0mkoseiF48V7Ae0oWy2m3btZhN2J0IJ/Q9ePCji1f/jzX/jts1BWx8MPN6bYWZekEhh0HW/ncLa+sbmVnG7tLO7t39QPjxqmTjVjDdZLGPdCajhUijeRIGSdxLNaRRI3g7GtzO//cS1EbF6wEnC/YgOlQgFo2ilVg9FxE2/XHGr7hxklXg5qUCORr/81RvELI24QiapMV3PTdDPqEbBJJ+WeqnhCWVjOuRdSxW1S/xsfu2UnFllQMJY21JI5urviYxGxkyiwHZGFEdm2ZuJ/3ndFMNrPxMqSZErtlgUppJgTGavk4HQnKGcWEKZFvZWwkZUU4Y2oJINwVt+eZW0LqperXp5X6vUb/I4inACp3AOHlxBHe6gAU1g8AjP8ApvTuy8OO/Ox6K14OQzx/AHzucPuMOPPA==</latexit>
⇥
<latexit sha1_base64="DFN4sfNhBNG+B7awRb3y/Saos6c=">AAAB7XicbVBNS8NAEJ3Ur1q/qh69LBbBU0mkoseiF48V7Ae0oWy2m3btZhN2J0IJ/Q9ePCji1f/jzX/jts1BWx8MPN6bYWZekEhh0HW/ncLa+sbmVnG7tLO7t39QPjxqmTjVjDdZLGPdCajhUijeRIGSdxLNaRRI3g7GtzO//cS1EbF6wEnC/YgOlQgFo2ilVg9FxE2/XHGr7hxklXg5qUCORr/81RvELI24QiapMV3PTdDPqEbBJJ+WeqnhCWVjOuRdSxW1S/xsfu2UnFllQMJY21JI5urviYxGxkyiwHZGFEdm2ZuJ/3ndFMNrPxMqSZErtlgUppJgTGavk4HQnKGcWEKZFvZWwkZUU4Y2oJINwVt+eZW0LqperXp5X6vUb/I4inACp3AOHlxBHe6gAU1g8AjP8ApvTuy8OO/Ox6K14OQzx/AHzucPuMOPPA==</latexit>
+
<latexit sha1_base64="3DnS3vImeIO9jz1IyYjxDR65oEU=">AAAB6HicbVDLSgNBEOyNrxhfUY9eBoMgCGFXInoMevGYgHlAsoTZSW8yZnZ2mZkVQsgXePGgiFc/yZt/4yTZgyYWNBRV3XR3BYng2rjut5NbW9/Y3MpvF3Z29/YPiodHTR2nimGDxSJW7YBqFFxiw3AjsJ0opFEgsBWM7mZ+6wmV5rF8MOME/YgOJA85o8ZK9YteseSW3TnIKvEyUoIMtV7xq9uPWRqhNExQrTuemxh/QpXhTOC00E01JpSN6AA7lkoaofYn80On5MwqfRLGypY0ZK7+npjQSOtxFNjOiJqhXvZm4n9eJzXhjT/hMkkNSrZYFKaCmJjMviZ9rpAZMbaEMsXtrYQNqaLM2GwKNgRv+eVV0rwse5XyVb1Sqt5mceThBE7hHDy4hircQw0awADhGV7hzXl0Xpx352PRmnOymWP4A+fzB3QdjLc=</latexit>
γ ZT
γ
2
<latexit sha1_base64="KABtTuE2bHd1XLi8DfYY+6Pgzgs=">AAAB6HicbVDLTgJBEOzFF+IL9ehlIjHxRHYJRo9ELx4hkUcCGzI79MLI7OxmZtaEEL7AiweN8eonefNvHGAPClbSSaWqO91dQSK4Nq777eQ2Nre2d/K7hb39g8Oj4vFJS8epYthksYhVJ6AaBZfYNNwI7CQKaRQIbAfju7nffkKleSwfzCRBP6JDyUPOqLFSo9IvltyyuwBZJ15GSpCh3i9+9QYxSyOUhgmqdddzE+NPqTKcCZwVeqnGhLIxHWLXUkkj1P50ceiMXFhlQMJY2ZKGLNTfE1MaaT2JAtsZUTPSq95c/M/rpia88adcJqlByZaLwlQQE5P512TAFTIjJpZQpri9lbARVZQZm03BhuCtvrxOWpWyVy1fNaql2m0WRx7O4BwuwYNrqME91KEJDBCe4RXenEfnxXl3PpatOSebOYU/cD5/AH65jL4=</latexit>
2
<latexit sha1_base64="KABtTuE2bHd1XLi8DfYY+6Pgzgs=">AAAB6HicbVDLTgJBEOzFF+IL9ehlIjHxRHYJRo9ELx4hkUcCGzI79MLI7OxmZtaEEL7AiweN8eonefNvHGAPClbSSaWqO91dQSK4Nq777eQ2Nre2d/K7hb39g8Oj4vFJS8epYthksYhVJ6AaBZfYNNwI7CQKaRQIbAfju7nffkKleSwfzCRBP6JDyUPOqLFSo9IvltyyuwBZJ15GSpCh3i9+9QYxSyOUhgmqdddzE+NPqTKcCZwVeqnGhLIxHWLXUkkj1P50ceiMXFhlQMJY2ZKGLNTfE1MaaT2JAtsZUTPSq95c/M/rpia88adcJqlByZaLwlQQE5P512TAFTIjJpZQpri9lbARVZQZm03BhuCtvrxOWpWyVy1fNaql2m0WRx7O4BwuwYNrqME91KEJDBCe4RXenEfnxXl3PpatOSebOYU/cD5/AH65jL4=</latexit>
ZT
2
<latexit sha1_base64="KABtTuE2bHd1XLi8DfYY+6Pgzgs=">AAAB6HicbVDLTgJBEOzFF+IL9ehlIjHxRHYJRo9ELx4hkUcCGzI79MLI7OxmZtaEEL7AiweN8eonefNvHGAPClbSSaWqO91dQSK4Nq777eQ2Nre2d/K7hb39g8Oj4vFJS8epYthksYhVJ6AaBZfYNNwI7CQKaRQIbAfju7nffkKleSwfzCRBP6JDyUPOqLFSo9IvltyyuwBZJ15GSpCh3i9+9QYxSyOUhgmqdddzE+NPqTKcCZwVeqnGhLIxHWLXUkkj1P50ceiMXFhlQMJY2ZKGLNTfE1MaaT2JAtsZUTPSq95c/M/rpia88adcJqlByZaLwlQQE5P512TAFTIjJpZQpri9lbARVZQZm03BhuCtvrxOWpWyVy1fNaql2m0WRx7O4BwuwYNrqME91KEJDBCe4RXenEfnxXl3PpatOSebOYU/cD5/AH65jL4=</latexit>
2
<latexit sha1_base64="KABtTuE2bHd1XLi8DfYY+6Pgzgs=">AAAB6HicbVDLTgJBEOzFF+IL9ehlIjHxRHYJRo9ELx4hkUcCGzI79MLI7OxmZtaEEL7AiweN8eonefNvHGAPClbSSaWqO91dQSK4Nq777eQ2Nre2d/K7hb39g8Oj4vFJS8epYthksYhVJ6AaBZfYNNwI7CQKaRQIbAfju7nffkKleSwfzCRBP6JDyUPOqLFSo9IvltyyuwBZJ15GSpCh3i9+9QYxSyOUhgmqdddzE+NPqTKcCZwVeqnGhLIxHWLXUkkj1P50ceiMXFhlQMJY2ZKGLNTfE1MaaT2JAtsZUTPSq95c/M/rpia88adcJqlByZaLwlQQE5P512TAFTIjJpZQpri9lbARVZQZm03BhuCtvrxOWpWyVy1fNaql2m0WRx7O4BwuwYNrqME91KEJDBCe4RXenEfnxXl3PpatOSebOYU/cD5/AH65jL4=</latexit>
⇥
<latexit sha1_base64="DFN4sfNhBNG+B7awRb3y/Saos6c=">AAAB7XicbVBNS8NAEJ3Ur1q/qh69LBbBU0mkoseiF48V7Ae0oWy2m3btZhN2J0IJ/Q9ePCji1f/jzX/jts1BWx8MPN6bYWZekEhh0HW/ncLa+sbmVnG7tLO7t39QPjxqmTjVjDdZLGPdCajhUijeRIGSdxLNaRRI3g7GtzO//cS1EbF6wEnC/YgOlQgFo2ilVg9FxE2/XHGr7hxklXg5qUCORr/81RvELI24QiapMV3PTdDPqEbBJJ+WeqnhCWVjOuRdSxW1S/xsfu2UnFllQMJY21JI5urviYxGxkyiwHZGFEdm2ZuJ/3ndFMNrPxMqSZErtlgUppJgTGavk4HQnKGcWEKZFvZWwkZUU4Y2oJINwVt+eZW0LqperXp5X6vUb/I4inACp3AOHlxBHe6gAU1g8AjP8ApvTuy8OO/Ox6K14OQzx/AHzucPuMOPPA==</latexit>
⇥
<latexit sha1_base64="DFN4sfNhBNG+B7awRb3y/Saos6c=">AAAB7XicbVBNS8NAEJ3Ur1q/qh69LBbBU0mkoseiF48V7Ae0oWy2m3btZhN2J0IJ/Q9ePCji1f/jzX/jts1BWx8MPN6bYWZekEhh0HW/ncLa+sbmVnG7tLO7t39QPjxqmTjVjDdZLGPdCajhUijeRIGSdxLNaRRI3g7GtzO//cS1EbF6wEnC/YgOlQgFo2ilVg9FxE2/XHGr7hxklXg5qUCORr/81RvELI24QiapMV3PTdDPqEbBJJ+WeqnhCWVjOuRdSxW1S/xsfu2UnFllQMJY21JI5urviYxGxkyiwHZGFEdm2ZuJ/3ndFMNrPxMqSZErtlgUppJgTGavk4HQnKGcWEKZFvZWwkZUU4Y2oJINwVt+eZW0LqperXp5X6vUb/I4inACp3AOHlxBHe6gAU1g8AjP8ApvTuy8OO/Ox6K14OQzx/AHzucPuMOPPA==</latexit>
+
<latexit sha1_base64="3DnS3vImeIO9jz1IyYjxDR65oEU=">AAAB6HicbVDLSgNBEOyNrxhfUY9eBoMgCGFXInoMevGYgHlAsoTZSW8yZnZ2mZkVQsgXePGgiFc/yZt/4yTZgyYWNBRV3XR3BYng2rjut5NbW9/Y3MpvF3Z29/YPiodHTR2nimGDxSJW7YBqFFxiw3AjsJ0opFEgsBWM7mZ+6wmV5rF8MOME/YgOJA85o8ZK9YteseSW3TnIKvEyUoIMtV7xq9uPWRqhNExQrTuemxh/QpXhTOC00E01JpSN6AA7lkoaofYn80On5MwqfRLGypY0ZK7+npjQSOtxFNjOiJqhXvZm4n9eJzXhjT/hMkkNSrZYFKaCmJjMviZ9rpAZMbaEMsXtrYQNqaLM2GwKNgRv+eVV0rwse5XyVb1Sqt5mceThBE7hHDy4hircQw0awADhGV7hzXl0Xpx352PRmnOymWP4A+fzB3QdjLc=</latexit>
γ ZT
γ ZT
2
<latexit sha1_base64="KABtTuE2bHd1XLi8DfYY+6Pgzgs=">AAAB6HicbVDLTgJBEOzFF+IL9ehlIjHxRHYJRo9ELx4hkUcCGzI79MLI7OxmZtaEEL7AiweN8eonefNvHGAPClbSSaWqO91dQSK4Nq777eQ2Nre2d/K7hb39g8Oj4vFJS8epYthksYhVJ6AaBZfYNNwI7CQKaRQIbAfju7nffkKleSwfzCRBP6JDyUPOqLFSo9IvltyyuwBZJ15GSpCh3i9+9QYxSyOUhgmqdddzE+NPqTKcCZwVeqnGhLIxHWLXUkkj1P50ceiMXFhlQMJY2ZKGLNTfE1MaaT2JAtsZUTPSq95c/M/rpia88adcJqlByZaLwlQQE5P512TAFTIjJpZQpri9lbARVZQZm03BhuCtvrxOWpWyVy1fNaql2m0WRx7O4BwuwYNrqME91KEJDBCe4RXenEfnxXl3PpatOSebOYU/cD5/AH65jL4=</latexit>
⇥
<latexit sha1_base64="DFN4sfNhBNG+B7awRb3y/Saos6c=">AAAB7XicbVBNS8NAEJ3Ur1q/qh69LBbBU0mkoseiF48V7Ae0oWy2m3btZhN2J0IJ/Q9ePCji1f/jzX/jts1BWx8MPN6bYWZekEhh0HW/ncLa+sbmVnG7tLO7t39QPjxqmTjVjDdZLGPdCajhUijeRIGSdxLNaRRI3g7GtzO//cS1EbF6wEnC/YgOlQgFo2ilVg9FxE2/XHGr7hxklXg5qUCORr/81RvELI24QiapMV3PTdDPqEbBJJ+WeqnhCWVjOuRdSxW1S/xsfu2UnFllQMJY21JI5urviYxGxkyiwHZGFEdm2ZuJ/3ndFMNrPxMqSZErtlgUppJgTGavk4HQnKGcWEKZFvZWwkZUU4Y2oJINwVt+eZW0LqperXp5X6vUb/I4inACp3AOHlxBHe6gAU1g8AjP8ApvTuy8OO/Ox6K14OQzx/AHzucPuMOPPA==</latexit>
⇥
<latexit sha1_base64="DFN4sfNhBNG+B7awRb3y/Saos6c=">AAAB7XicbVBNS8NAEJ3Ur1q/qh69LBbBU0mkoseiF48V7Ae0oWy2m3btZhN2J0IJ/Q9ePCji1f/jzX/jts1BWx8MPN6bYWZekEhh0HW/ncLa+sbmVnG7tLO7t39QPjxqmTjVjDdZLGPdCajhUijeRIGSdxLNaRRI3g7GtzO//cS1EbF6wEnC/YgOlQgFo2ilVg9FxE2/XHGr7hxklXg5qUCORr/81RvELI24QiapMV3PTdDPqEbBJJ+WeqnhCWVjOuRdSxW1S/xsfu2UnFllQMJY21JI5urviYxGxkyiwHZGFEdm2ZuJ/3ndFMNrPxMqSZErtlgUppJgTGavk4HQnKGcWEKZFvZWwkZUU4Y2oJINwVt+eZW0LqperXp5X6vUb/I4inACp3AOHlxBHe6gAU1g8AjP8ApvTuy8OO/Ox6K14OQzx/AHzucPuMOPPA==</latexit>
+
<latexit sha1_base64="3DnS3vImeIO9jz1IyYjxDR65oEU=">AAAB6HicbVDLSgNBEOyNrxhfUY9eBoMgCGFXInoMevGYgHlAsoTZSW8yZnZ2mZkVQsgXePGgiFc/yZt/4yTZgyYWNBRV3XR3BYng2rjut5NbW9/Y3MpvF3Z29/YPiodHTR2nimGDxSJW7YBqFFxiw3AjsJ0opFEgsBWM7mZ+6wmV5rF8MOME/YgOJA85o8ZK9YteseSW3TnIKvEyUoIMtV7xq9uPWRqhNExQrTuemxh/QpXhTOC00E01JpSN6AA7lkoaofYn80On5MwqfRLGypY0ZK7+npjQSOtxFNjOiJqhXvZm4n9eJzXhjT/hMkkNSrZYFKaCmJjMviZ9rpAZMbaEMsXtrYQNqaLM2GwKNgRv+eVV0rwse5XyVb1Sqt5mceThBE7hHDy4hircQw0awADhGV7hzXl0Xpx352PRmnOymWP4A+fzB3QdjLc=</latexit>
γ ZT
Bosonic Interference
0 50 100 150 200 250 300mXX [GeV]
10�7
10�6
10�5
10�4
10�3
1/�
d�/d
mX
X[G
eV�
1]
Ee = 10 TeV
eL ! eL �/ZT ! eL XX
0 50 100 150 200 250 300mXX [GeV]
10�7
10�6
10�5
10�4
10�3
eR ! eR �/ZT ! eR XX
⌫⌫ff (Int.)ff (No int.)W+W� (Int.)W+W� (No int.)
Overlap Veto2x EW
1x QCD 1x EW
2x QCD
Last emission QCD? dLastij < min�dEWij
�
<latexit sha1_base64="hx+LDzOiq6qPgB76+lPIg/ikiSA=">AAACI3icbVC7SgNBFJ31GeMramkzGARtwq5EFLEQRbCwUDBGyMYwO7mbjM7OLjN3xbDsv9j4KzYWSrCx8F+cxBS+DgwczjmXO/cEiRQGXffdGRufmJyaLswUZ+fmFxZLS8uXJk41hxqPZayvAmZACgU1FCjhKtHAokBCPbg9Gvj1O9BGxOoCewk0I9ZRIhScoZVapb12KxM3+XXmI9xjdsoM5jndp34klC8hxI2fgeN6nvtadLq42SqV3Yo7BP1LvBEpkxHOWqW+3455GoFCLpkxDc9NsJkxjYJLyIt+aiBh/JZ1oGGpYhGYZja8MafrVmnTMNb2KaRD9ftExiJjelFgkxHDrvntDcT/vEaK4W4zEypJERT/WhSmkmJMB4XRttDAUfYsYVwL+1fKu0wzjrbWoi3B+33yX3K5VfGqle3zavngcFRHgaySNbJBPLJDDsgJOSM1wskDeSIv5NV5dJ6dvvP2FR1zRjMr5Aecj0+MPKYP</latexit>
Last emission EW? dLastij < min⇣dQCDij
⌘
<latexit sha1_base64="38Ms+e3UrXbHF7SyrpWf1cj4xe8=">AAACJHicbVC7SgNBFJ31GeMramkzGARtwq5EFLQQY2FhoWBUyMYwO7mbjM7OLjN3xbDsx9j4KzYWPrCw8VucxBS+DgwczjmXO/cEiRQGXffdGRkdG5+YLEwVp2dm5+ZLC4tnJk41hzqPZawvAmZACgV1FCjhItHAokDCeXBd6/vnN6CNiNUp9hJoRqyjRCg4Qyu1SjvtViau8svMR7jF7IgZzHO6S/1IKF9CiGs/Aye1gzz3teh0cb1VKrsVdwD6l3hDUiZDHLdKL3475mkECrlkxjQ8N8FmxjQKLiEv+qmBhPFr1oGGpYpFYJrZ4MicrlqlTcNY26eQDtTvExmLjOlFgU1GDLvmt9cX//MaKYbbzUyoJEVQ/GtRmEqKMe03RttCA0fZs4RxLexfKe8yzTjaXou2BO/3yX/J2UbFq1Y2T6rlvf1hHQWyTFbIGvHIFtkjh+SY1Aknd+SBPJFn5955dF6dt6/oiDOcWSI/4Hx8AiJLplU=</latexit>
Accept Branching
dij = min�k2T,i, k
2T,j
� �ij
R+m2
i +m2j �m2
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Double counting problem
Veto procedure
Overlap Veto
10�2
10�1
100
d�/d
�R
VV
[pb]
0.5TeV < p?,jet < 1TeV
pp ! V V j (no overlap veto)
10�2
10�1
100
pp ! V V j (overlap veto)
V V j (ME)(V V + V j) + Vincia
V V + Vincia (QCD)V j + Vincia (EW)V j + Pythia (EW)
0 1 2 3 4�RV V
100
Rat
io
0 1 2 3 4�RV V
100
Resonance Matching
• Large scales: EW shower offers best description
• Small scales:Breit-Wigner distribution
Branchings like t ! bW
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Z ! qq
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, etc.
๏Matching:• Sample mass from Breit-Wigner
upon production• Suppress shower by factor
Q4
(Q2 +Q2EW)2
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BW(Q2) / m0�(m)
Q4 +m20�(m)2
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• Decay when shower hits off-shellness scale
50 100 150 200 250 300 350mt [GeV]
10�6
10�5
10�4
10�3
10�2
10�1
1/�
d�/d
mt[G
eV�
1]
Et = 1 TeV
tL ! b W+
Breit-WignerShowerMatched
Interleaved Resonance Decays
Q2W→qq′
Q2
b W+
q q′
t
Q2t→bW
b q q′
Hard system Resonance system Resonance system
m2t
m2W
Q2hard
•Evolution up to offshellness scale of the resonance
•Perform resonance shower
• Insert showered decay products and continue evolution
•Complete evolution of the hard system
•Perform resonance shower
Sequential
Interleaved
Interleaved Resonance Decays
10�3
10�2
10�1
100
dN/d
⇠
ps = 500 GeV
ee ! tt (Parton level)
SequentialInterleaved, �0Interleaved, P (m)
0 2 4 6 8 10
⇠ = 2 ln(QFSRT /GeV)
0.8
1.0
1.2
Rat
io
0 2 4 6 8 10⇠
10�3
10�2
10�1
100
dN/d
⇠
Top-Quark Radiators
0 2 4 6 8⇠
Top-DecayResonance Showers
0 2 4 6 8⇠
Non-Top Radiators
Conclusions
• Rich physics & many features unique to the EW sector- EW symmetry breaking / Goldstone contributions- Matching to resonance decays- Neutral boson interference- Overlap between hard scatterings
• Many other features yet to implement- Treatment of soft & spin interference- Bloch-Nordsieck violations
QED & EW shower, and interleaved resonance decays available in Pythia 8.304
• Includes full soft multipole structure, while interleaved with QCD showerQED Shower
EW Shower
Interleaved Resonance Decays• Physically-intuitive treatment of finite-width / offshell resonances
• More results in 2108.10786
Interleaving Results
2
4
6
1/�
d�/d
mW
[GeV
�1]
⇥10�2
ps = 8 TeV
0.25
0.50
0.75
1.00
1.25
1.50
1/�
d�/d
mt[G
eV�
1]
⇥10�2
SequentialInterleaved, �0Interleaved, P (m)
�10 �5 0 5 10
mrecW � mpole
W [GeV]
0.8
1.0
1.2
Rat
io
�20 �10 0 10 20
mrect � mpole
t [GeV]
0.8
1.0
1.2
Rat
io
pp ! tt (Semileptonic, Hadron level)