BABAR C++ Course Running the Examples - HEPHY

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Find D 0 sFind more D 0 and D*Find all the D 0 –> Kπ candidatesHepAList D0s;Combiner D0comb1(&kaons, &pions);while ( t = D0comb1.next() ) {if (t->charge() != 0.0) continue;if (fabs(t->mass() - d0Mass) > 0.2) continue;D0s.append(new AsTrack(*t));}• D0comb1 is initialized with two different lists• D0comb1.next() doespicks next track from kaon listlocks the trackpicks next unlocked track from pion listcreate and return pointer to new track which is sum• thus a measured track is never used twice in onecombination• note we must make copy of trackFind D 0 ->Kππ 0Combiner D0comb2(&kaons, &pions, &piZeros);while ( t = D0comb2.next() ) {if (t->charge() != 0.0) continue;if (fabs(t->mass() - d0Mass) > 0.2) continue;D0s.append(new AsTrack(*t));}Find D *HepAList Dstars;Combiner DsComb(&D0s, &pions);while ( t = DsComb.next() ) {if (fabs(t->mass() - dStarMass) > 0.2) continue;Dstars.append(new AsTrack(*t));}• Combiner allows variable number of arguments• D 0 –> Kπ and D 0 –> Kππ 0 go into same D0s list• Locking a track from D0s list, will lock all itschildren• note that the while loops are no more complex thenthe previous onesBABAR C++ Course 156 Paul F. KunzBABAR C++ Course 157 Paul F. Kunz
Finally, find all B 0 –> D * D *SummaryUse the Combiner again to find the B 0 sCombiner B0Comb(&Dstars, &Dstars);int B0Count = 0;while ( t = B0Comb.next() ) {if (t->charge() != 0) continue;if (fabs(t->mass() - B0Mass) > 0.2) continue;// find B’s momentum in CM frameHepLorentzVector b(*t);b.boost(CMBoost);• b will be the Lorentz vector component of our B 0• CMBoost was calculated in our initialization step• obviously, can do a lot more things at this stageWe now know enough C++ to do a physics analysisNext session we’ll look at polymorphic uses ofinheritance with examples from GismoThen, we’ll be pretty much done with learning thelanguageIt’s soon time to start some mini-projects using C++BABAR C++ Course 158 Paul F. KunzBABAR C++ Course 159 Paul F. Kunz
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BABAR C++ CourseRunning the Example
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C++ Input and OutputMore on I/OIntr
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Declaring types and initializingTyp
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Relational OperatorsLogical operato
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Assignment operatorsOperator Preced
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Coding Styleswhile loopC/C++ is fre
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do-while Examplefor loopSnippet fro
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ArraysExample Code and a TestA coll
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Plan of the dayFunctionsFunctionsPo
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Functions in CHeader FilesFunction
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Pointers and ArraysPointer Arithmet
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Progression towards C++ styleExampl
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Line fit continuedCharacter Strings
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Page 93 and 94: Back to implementationFollowing the
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