<div dir="ltr"><div>Hi John,</div><div>Yes, that should be good, this is exactly what we are trying to do, ie pruning away events that we know will produce bad tracks (since those bad tracks are never part of our good event sample).</div><div>Nonetheless, I think we should certainly check the difference in the tracking eff, with and without the dipole exit cut (removing it from both should and did when not using dipole cut) and see how large of a difference it makes.</div><div>Cheers</div><div>Dipangkar</div><div><br></div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Jul 27, 2020 at 5:34 PM John Matter <<a href="mailto:jcm6fv@virginia.edu">jcm6fv@virginia.edu</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div dir="ltr">Hi all,<div><br></div><div>hcana uses the golden track's info to set InsideDipoleExit to true or false. See the lines around 655 in the link below</div><div><br></div><div><a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__github.com_johnmatter_hcana_blob_59652700d08f10949e0d9b399ff4f70ddc9debf5_src_THcDC.cxx-23L655&d=DwMFaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=XtVl8BY42jbbWh0Vu1ygqgFBYEJMENirtKAh3P_9ayw&m=kF3mY6QmwY_-Rg5eY5m6mmZxjdJEPeVOPJS_SEMYkf4&s=9v81oaJV1KKk1V6RphcE43IB39Bf34QS_UAhcXzlQb0&e=" target="_blank">https://github.com/johnmatter/hcana/blob/59652700d08f10949e0d9b399ff4f70ddc9debf5/src/THcDC.cxx#L655</a><br></div><div><br></div><div>InsideDipoleExit is initialized to true on line 512. So using "inside==true" in the "should" cut fortunately won't exclude ntrack==0 events from the "should" count.</div><div><br></div><div>However, it will exclude some events (ntrack>0 events with golden tracks outside the dipole exit) from both the "should" and "did" counts. Is this what we want?</div><div><br clear="all"><div><div dir="ltr"><div dir="ltr">- John</div></div></div></div></div></div>
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