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HV1.0 Monte Carlo Simulation Tool for V-Hadrons

Explore the new features and enhancements of the HV1.0 Monte Carlo program for simulating V-hadrons. This updated version allows for user-defined theories, enhanced V-sector modeling, and more production processes. Stay informed on the latest changes and functionalities.

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HV1.0 Monte Carlo Simulation Tool for V-Hadrons

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  1. The HV1.0 Monte Carlo Steve Mrenna, Peter Skands, and MJS

  2. Features and Important Facts • The new program can do more things  • Final state can be in form of • Les Houches accord event record • All v-hadrons in final state; user must decay them • Stable v-hadron and unstable-v-hadron standard-model decay products NEW • HEPEVT hadron-level output • Two approaches to v-sector • Scaled-up QCD • User-defined theory with independent fragmentation NEW • More production processes • Z’ • Others in development (not tested yet)

  3. Features and Important Facts • User Input has changed and is still changing  • User defines the process via standard Pythia call NEW • User defines the theory through two upload files and standard Pythia calls NEW • Currently CALL PYUPDA (Pythia < 6.410) • Moving to CALL PYSLHA (Pythia = 6.410) • HV.input.par file in process of adjustment • Some “IMODE”s of operation no longer active, new ones added • New input file needed to control fragmentation, other settings; not present yet

  4. HV.input.par Note the running modes have changed! Use 2,4,5 only '! IMODE 1 lha + hepevt output (UE subtlety, see README) 2 lha output (vhadron level) 3 lha input -> pythia output (not tested) 4 lha output (parton level) 5 hepevt output (hadron level)' 3/15/07 !!!!only use modes 2,4,5 for now '! In modes 2,4 program shuts off fragmentation of proton remnants in initial state, showering/hadronization in final state '! Add 60 to IMODE for A0,H0 bosons to be standins for vpions in lha file' '! IHVTHY0 -- 1 is scaled-up vQCD, 9 is user-defined theory '! number of flavors inferred from input file where vquarks x00000f appear '! scale for scaled-up vQCD inferred from vQCDscale (code x000100) '! '! IFRAG: 0 default, 1 independent vfragmentation, '! 2 scaled-up qcd hadronization, 3 scaled-up qcd showering and fragmentation' '! Default is ifrag=3 for ihvthy0=1, ifrag=1 for ihvthy=9 '! '! The START LINE initiates read-in' '! The next line reads in:' '! IMODE,IDIAGN,NEV,IRANDM,ICLDR,IHVTHY0,IFRAG' 'START' 2,9,3,24181784,0,9,0 ! do not insert a comment line next myinput ! this line must be the input file prefix followed by a space ! myoutput ! this line must be the output file prefix followed by a space ! MSEL=0 ! user control ! MSUB(141)=1 ! Z' production ! MSTP(44)=3 ! no interference ! MSTP(47)=0 ! phase space Z' CKIN(1)=1650.D0 ! minimum partonic collision energy 'END' Temporary – is this needed anymore? Note masses and decays are no longer set here… But the process (Z’ production) is set here

  5. Input v-sector (PYUPDA version) pdg code name conjugate mass width decay info 6000021 gv 0 0 0 0.00000 0.00000 0.00000 0.00000E+00 0 0 6000001 dv dvbar 0 0 1 0.06000 0.00000 0.00000 0.00000E+00 0 0 6000002 uv uvbar 0 0 1 0.03000 0.00000 0.00000 0.00000E+00 0 0 6000091 vcluster 0 0 0 0.00000 0.00000 0.00000 0.00000E+00 0 0 6000092 vstring 0 0 0 0.00000 0.00000 0.00000 0.00000E+00 0 0 6000093 vindep 0 0 0 0.00000 0.00000 0.00000 0.00000E+00 0 0 6000094 CMvshwr 0 0 0 0.00000 0.00000 0.00000 0.00000E+00 0 0 6000100 Lambda_V 0 0 0 55.00000 0.00000 0.00000 0.00000E+00 0 0 6000111 piv0 0 0 0 13.49800 0.00001 0.00000 1.30680E+01 2 1 1 0 1.000000 5 -5 0 0 0 6000113 rhov0 0 0 0 76.85000 0.15100 0.00000 1.30680E-12 2 1 1 0 1.000000 6000211 -6000211 0 0 0 6000115 a_2v0 0 0 0 131.80000 0.10700 0.00000 1.84418E-12 2 1 1 0 0.414132 6000213 -6000211 0 0 0 1 0 0.414132 -6000213 6000211 0 0 0 1 0 0.171735 6000221 6000111 0 0 0 6000211 piv+ piv- 0 0 1 13.95700 0.00000 0.00000 0.00000E+00 0 0 6000213 rhov+ rhov- 0 0 1 76.69000 0.14900 0.00000 1.32434E-12 2 1 1 0 1.000000 6000211 6000111 0 0 0 6000215 a_2v+ a_2v- 0 0 1 131.80000 0.10700 0.00000 1.84418E-12 2 1 1 0 1.000000 6000221 6000211 0 0 0 6000221 etav 0 0 0 54.74500 0.10000 0.00000 1.97327E-12 2 1 1 0 1.000000 6000111 6000111 6000111 0 0 Decays

  6. Input Z’ Br’s (PYUPDA version) 32 Z'0 0 0 0 3200.00000 14.54029 145.40294 0.00000E+00 1 1 0 32 0.145835 1 -1 0 0 0 0 32 0.113276 2 -2 0 0 0 0 32 0.145835 3 -3 0 0 0 0 32 0.113271 4 -4 0 0 0 0 32 0.145781 5 -5 0 0 0 0 32 0.029002 6 -6 0 0 0 0 32 0.020000 7 -7 0 0 0 0 32 0.000000 8 -8 0 0 0 0 0 0.032025 11 -11 0 0 0 0 0 0.063642 12 -12 0 0 0 0 0 0.032025 13 -13 0 0 0 0 0 0.063642 14 -14 0 0 0 1 0 0.032022 6000001 -6000001 0 0 0 1 0 0.063642 6000002 -6000002 0 0 0 0 0 0.000000 17 -17 0 0 0 0 0 0.000000 18 -18 0 0 0 0 0 0.000000 24 -24 0 0 0 0 0 0.000000 37 -37 0 0 0 0 0 0.000000 23 22 0 0 0 0 0 0.000000 23 25 0 0 0 0 0 0.000000 25 36 0 0 0 0 0 0.000000 35 36 0 0 0 Note all decays are disabled except those to v-quarks

  7. Output MODE 2: V-hadrons <event> 17 661 1. 25.5996552 0.00781999994 0.115999997 -1 -1 0 0 0 501 -0.17 -0.96 867.46 867.46 0.00 0. 9. 1 -1 0 0 501 0 -2.41 -2.29 -2903.10 2903.10 0.00 0. 9. 32 2 1 2 0 0 -2.58 -3.25 -2035.64 3770.56 3173.85 0.0000 9. 6000002 2 3 0 0 0 -1263.33 939.33 -1256.00 2013.92 0.03 0.0000 9. -6000002 2 3 0 0 0 1260.75 -942.58 -779.64 1756.64 0.03 0.0000 9. 6000092 2 4 0 0 0 -2.58 -3.25 -2035.64 3770.56 3173.85 0.0000 9. 6000111 1 6 0 0 0 81.47 -4.92 41.97 95.28 25.60 0.0000 9. -6000211 1 6 0 0 0 19.69 -40.24 -29.20 59.66 26.47 0.0000 9. -6000211 1 6 0 0 0 -494.84 353.82 -432.07 746.62 26.47 0.0000 9. 6000211 1 6 0 0 0 -250.89 244.01 -309.06 467.66 26.47 0.0000 9. 6000111 1 6 0 0 0 -81.67 48.28 -78.96 126.06 25.60 0.0000 9. 6000211 1 6 0 0 0 -281.16 187.12 -365.39 498.27 26.47 0.0000 9. 6000111 1 6 0 0 0 -100.93 55.15 -75.22 139.79 25.60 0.0000 9. -6000211 1 6 0 0 0 157.95 -55.25 -37.65 173.55 26.47 0.0000 9. 6000211 1 6 0 0 0 82.56 -69.14 -129.98 170.85 26.47 0.0000 9. -6000211 1 6 0 0 0 167.64 -199.98 -157.34 305.86 26.47 0.0000 9. 6000211 1 6 0 0 0 697.61 -522.10 -462.75 986.96 26.47 0.0000 9. </event> 6000111 is pizero, 6000211 is piplus; no “neutrinos” anymore

  8. Output MODE 4: <event> 23 661 1. 25.5996552 0.00781999994 0.115999997 -1 -1 0 0 0 501 -0.17 -0.96 867.46 867.46 0.00 0. 9. 1 -1 0 0 501 0 -2.41 -2.29 -2903.10 2903.10 0.00 0. 9. 32 2 1 2 0 0 -2.58 -3.25 -2035.64 3770.56 3173.85 0.0000 9. 6000002 2 3 0 0 0 -1263.33 939.33 -1256.00 2013.92 0.03 0.0000 9. -6000002 2 3 0 0 0 1260.75 -942.58 -779.64 1756.64 0.03 0.0000 9. 6000092 2 4 0 0 0 -2.58 -3.25 -2035.64 3770.56 3173.85 0.0000 9. 6000111 2 6 0 0 0 81.47 -4.92 41.97 95.28 25.60 4.7274 9. -6000211 1 6 0 0 0 19.69 -40.24 -29.20 59.66 26.47 0.0000 9. -6000211 1 6 0 0 0 -494.84 353.82 -432.07 746.62 26.47 0.0000 9. 6000211 1 6 0 0 0 -250.89 244.01 -309.06 467.66 26.47 0.0000 9. 6000111 2 6 0 0 0 -81.67 48.28 -78.96 126.06 25.60 4.3217 9. 6000211 1 6 0 0 0 -281.16 187.12 -365.39 498.27 26.47 0.0000 9. 6000111 2 6 0 0 0 -100.93 55.15 -75.22 139.79 25.60 12.1460 9. -6000211 1 6 0 0 0 157.95 -55.25 -37.65 173.55 26.47 0.0000 9. 6000211 1 6 0 0 0 82.56 -69.14 -129.98 170.85 26.47 0.0000 9. -6000211 1 6 0 0 0 167.64 -199.98 -157.34 305.86 26.47 0.0000 9. 6000211 1 6 0 0 0 697.61 -522.10 -462.75 986.96 26.47 0.0000 9. 5 1 7 0 511 0 2.18 -2.26 0.86 5.80 4.80 0.0000 9. -5 1 7 0 0 511 79.28 -2.66 41.10 89.47 4.80 0.0000 9. 5 1 11 0 515 0 -54.30 41.01 -64.59 93.95 4.80 0.0000 9. -5 1 11 0 0 515 -27.37 7.27 -14.37 32.11 4.80 0.0000 9. 5 1 13 0 517 0 -7.16 3.01 -0.88 9.17 4.80 0.0000 9. -5 1 13 0 0 517 -93.76 52.14 -74.34 130.62 4.80 0.0000 9. </event> Can you use this? How much information about the new v-particles do you need?

  9. Output Mode 5: Hadrons • Same as before, except now the new 6000xxx particles appear in the HEPEVT record • This will cause problems for the event display program • However we can either • Keep a mode in the current HV program so that 6000xxx particles are replaced with H0, A0 (this is currently the case, add 60 to IMODE • Write a script to convert all 6000xxx particles to something the programs recognize • Convert the programs to recognize 6000xxx particles

  10. Summary • Many advances but not stable yet • Currently must use a non-standard Pythia version because of problems and bugs • Usable I think! But will need to adjust input details as time goes on • Need to decide on output modes; is current arrangement for output mode 4 ideal, or must it be altered? • How should we move away from using H0/A0 in our code? • How are Pythia/GEANT/Athena to be taught about the new particles and their properties, which are needed even in mode 4? • New theories can also be studied now, but that’s for the future • PYUPDA will move to PYSLHA when Atlas moves to Pythia 6.411

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