Erik Krebs, review from Tetyana

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-%%Title: CMSY7
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-%%CreationDate: Mon Jul 13 16:17:00 2009
-%%Creator: David M. Jones
-%Copyright: Copyright (c) 1997, 2009 American Mathematical Society
-%Copyright: (<http://www.ams.org>), with Reserved Font Name CMSY7.
-% This Font Software is licensed under the SIL Open Font License, Version 1.1.
-% This license is in the accompanying file OFL.txt, and is also
-% available with a FAQ at: http://scripts.sil.org/OFL.
-%%EndComments
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-/FullName (CMSY7) readonly def
-/FamilyName (Computer Modern) readonly def
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-(pronounced)i(with)d(an)h(increasing)g(number)25858 53747
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-(optimal)25858 57732 y(magnetic)323 b(\002eld)g(con\002guration.)479
-b(The)322 b(impact)h(of)e(the)h(numerous)25858 59060
-y Fi(\016)42 b Fj(-electrons)250 b(emitted)f(from)g(the)h(tar)-20
-b(get)249 b(remains)h(to)f(be)h(tak)-11 b(en)250 b(into)25858
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-b Fj(-con)-44 b(v)-17 b(ersions)25858 61717 y(occurring)409
-b(in)e(the)h(additional)h(MVD)e(stations)g(has)g(to)h(be)g(opti-)25858
-63045 y(mized.)35765 65990 y Fb(Refer)-24 b(ences)25858
-67955 y Fa([1])553 b(C.)274 b(Alt)h(et)g(al.)g(\(N)-35
+26695 y(\(a\))277 b Fi(\032)27936 26294 y Fh(0)28709
+26695 y Fj(decays)i(and)f(\(b\))f Fi(\031)36112 26294
+y Fh(0)36608 26695 y Fj(-Dalitz)g(decays.)26965 30308
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+(lo)-28 b(w)219 b(momentum)i(part-)25858 31636 y(ner)410
+b(of)g(an)h Fi(e)30983 31235 y Fh(+)31718 31636 y Fi(=e)32786
+31235 y Fc(\000)33534 31636 y Fj(-pair)f(from)f(a)h Fi(\031)40167
+31235 y Fh(0)40663 31636 y Fj(-Dalitz)g(decay)-72 b(,)445
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+(the)g(product)g(of)g(the)f(momenta)25858 46248 y(of)309
+b(these)g(tw)-11 b(o)309 b(tracks.)439 b(A)309 b(wedge)i(cut)e(can)i
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+375 b([3].)639 b(The)376 b(additional)i(number)f(of)e(recon-)25858
+48905 y(structed)288 b(lo)-28 b(w-momentum)291 b(electrons)d(increases)
+h(the)f(number)h(of)25858 50233 y(background)336 b(pairs,)344
+b(which)333 b(is)e(rejected)i(by)f(this)f(cut.)508 b(This)331
+b(sug-)25858 51562 y(gests)305 b(that)h(the)f(MVD)h(might)g(help)g(to)f
+(reduce)i(the)f(related)g(back-)25858 52890 y(ground)291
+b(and)f(that)f(this)g(capability)h(is)e(getting)i(more)g(pronounced)
+25858 54218 y(with)277 b(an)h(increasing)g(number)h(of)d(MVD-stations.)
+26965 55547 y(Further)421 b(studies)e(are)i(needed)h(to)e(conclude)j
+(on)d(the)h(optimal)25858 56875 y(number)475 b(and)g(positions)e(of)g
+(MVD)h(stations)e(and)j(the)f(optimal)25858 58204 y(magnetic)323
+b(\002eld)g(con\002guration.)479 b(The)322 b(impact)h(of)e(the)h
+(numerous)25858 59532 y Fi(\016)42 b Fj(-electrons)250
+b(emitted)f(from)g(the)h(tar)-20 b(get)249 b(remains)h(to)f(be)h(tak)
+-11 b(en)250 b(into)25858 60860 y(account.)695 b(Finally)-72
+b(,)424 b(the)394 b(rejection)g(strate)-17 b(gy)394 b(for)f
+Fi(\015)61 b Fj(-con)-44 b(v)-17 b(ersions)25858 62189
+y(occurring)409 b(in)e(the)h(additional)h(MVD)e(stations)g(has)g(to)h
+(be)g(opti-)25858 63517 y(mized.)35765 66449 y Fb(Refer)-24
+b(ences)25858 68414 y Fa([1])553 b(C.)274 b(Alt)h(et)g(al.)g(\(N)-35
 b(A49)275 b(Collaboration\),)281 b(Ph)-5 b(ys.)275 b(Re)-25
-b(v)-65 b(.)275 b(C)f(78,)281 b(044907)27573 69172 y(\(2008\))25858
-70833 y([2])553 b(T)-74 b(.)345 b(Galatyuk,)369 b(PhD)344
+b(v)-65 b(.)275 b(C)f(78,)281 b(044907)27573 69632 y(\(2008\))25858
+71239 y([2])553 b(T)-74 b(.)345 b(Galatyuk,)369 b(PhD)344
 b(Thesis,)368 b(Goethe-Uni)-25 b(v)-15 b(ersit)45236
-70828 y(\250)45181 70833 y(at,)369 b(Frankfurt)344 b(am)27573
-72050 y(Main,)250 b(\(2009\))25858 73711 y([3])553 b(E.)249
+71234 y(\250)45181 71239 y(at,)369 b(Frankfurt)344 b(am)27573
+72457 y(Main,)250 b(\(2009\))25858 74064 y([3])553 b(E.)249
 b(Lebede)-25 b(v)g(a,)251 b(GSI-SR2012-PHN-NQM-EXP-54,)e(\(2012\))25858
-75371 y([4])553 b(I.)249 b(Froehlich)h(et)f(al.,)h(arXi)-25
+75671 y([4])553 b(I.)249 b(Froehlich)h(et)f(al.,)h(arXi)-25
 b(v:0708.2382)p eop end
 %%Trailer
 

diff --git a/GSI_2014_Krebs/GSI-2013-ekrebs.tex b/GSI_2014_Krebs/GSI-2013-ekrebs.tex
index 9d7bb7f7c7d7a637ad9076a5a83c6a04a8649a13..54a71c0447dc7e95e74c5550e11e74fd605c89a5 100644 (file)
--- a/GSI_2014_Krebs/GSI-2013-ekrebs.tex
+++ b/GSI_2014_Krebs/GSI-2013-ekrebs.tex
@@ -23,22 +23,16 @@
 
 \maketitle
 
-Low mass dilepton pairs are considered to be excellent probes of the microscopic properties of extreme 
-states of matter created in heavy-ion collisions. However, this signal has to be separated from a rich background of close pairs of electrons and positrons, which are created in $\gamma$-conversions and Dalitz decays 
-of $\pi^{0}$-mesons. The excellent position resolution of the Micro-Vertex Detector (MVD) of the CBM experiment and its proximity to the target offers a chance to reject efficiently the close pairs. This holds in particular for the abundant case, in which the magnetic field of CBM bends the low momentum partner out of the CBM acceptance while the high momentum partner contributes to the combinatorial background of the invariant mass spectrum. We tried to improve the reconstruction the low momentum partner by including points from the MVD into the track reconstruction and to reject the pair based on the reconstructed opening angle.
+Low mass electron (muon) pairs are considered to be excellent probes of the processes taking place in the interior of extreme states of matter formed in the collision zone of heavy-ions. However, the reconstructed distribution of of electron pairs contains in addition contributions from mesons decaying after freeze-out and from combinatorial pairs. Single electron or positron tracks from incompletely detected $\gamma$-conversions and Dalitz decays  of $\pi^{0}$-mesons are the most abundant source contributing to the significant combinatorial background. The excellent position resolution of the Micro-Vertex Detector (MVD) of the CBM experiment and its proximity to the target offers a chance to reject efficiently the close pairs. This holds in particular for the abundant case, in which the magnetic field of CBM bends the low momentum partner out of the CBM acceptance while the high momentum partner contributes to the combinatorial background of the invariant mass spectrum. We tried to improve the reconstruction the low momentum partner by including points from the MVD into the track reconstruction and to reject the pair based on the reconstructed opening angle.
 \begin{figure}[h]
 \vspace{-0.5cm}
 \centering
-\includegraphics*[width=0.35\textwidth]{fh_e_track_types_pi0_prim_10field.eps}
-\caption{Track types of dielectrons from $\pi^0$-Dalitz decays for different MVD-geometries, see text.}
+\includegraphics*[width=0.25\textwidth]{fh_e_track_types_pi0_prim_10field.eps}
+\caption{Track topology of dielectrons from $\pi^0$-Dalitz decays assuming different configurations of the MVD, i.e. no MVD or a MVD featuring different amount of sensor planes, see text.}
 \label{fig:tracktypes}
 \end{figure}
 
-The input of the study was generated with the thermal source generator PLUTO\cite{pluto}, which was used to simulate the dilepton decays for Au+Au reactions at SIS-100 and 
-SIS-300 energies. The simulation parameters were chosen such that the sources are consistent with $p_T$- 
-and rapidity distributions measured by NA49~\cite{na49}. The signals provided by Pluto were embedded into 
-UrQMD events. Two versions of the hadronic cocktail were used: One cocktail simulates the vector mesons at freeze-out, 
-the second one possible in-medium modifications of the $\rho_0$.
+Emission from a thermal source was assumed to simulate electron pairs from meson decays for Au+Au reactions at SIS-100 and SIS-300 energies. The simulation parameters were chosen such that the meson spectra are consistent with $p_T$ and rapidity distributions measured by NA49~\cite{na49}. The pairs simulated with the Pluto\cite{pluto} event generator are embedded into hadronic final states calculated with UrQMD. Two versions of the hadronic cocktail were used: one cocktail simulates vector meson decay in vacuum, the second one assumes an in-medium modification of the $\rho_0$.
 %
 %The momentum of an identified electron/positron track is correlated to the distance to the nearest hit in the first MVD station 
 %that does not belong to a recontructed track. The advantage of such a cut is that no momentum information of the unidentified 
@@ -56,15 +50,13 @@ the second one possible in-medium modifications of the $\rho_0$.
 %\label{fig:ht_cut}
 %\end{figure}
 
-Figure~\ref{fig:tracktypes} shows the track type of the low momentum partner of an $e^+/e^-$-pair from a $\pi^0$-Dalitz decay, where the high momentum partner was reconstructed and identified in the RICH. We distinguish track fragments (only individual hits are seen), track segments (also charge and momentum were reconstructed) and global tracks (also particle ID was reconstructed). The number of reconstructed track segments was found to increases substantially with the amount of MVD stations. This comes with draw backs in terms of increasing computing time. 
-
-In Figure~\ref{fig:tt_cut}, the opening angle between an identified electron and its nearest track segment is correlated to the product of the momenta of these two tracks. A wedge cut can be applied to reduce the 
+Figure~\ref{fig:tracktypes} shows the track type of the low momentum partner of an $e^+/e^-$-pair from a $\pi^0$-Dalitz decay, where the high momentum partner was reconstructed and identified in the RICH. We distinguish track fragments (only individual hits are seen), track segments (also charge and momentum were reconstructed) and global tracks (also particle ID was reconstructed). The number of reconstructed track segments was found to increases substantially with the amount of MVD stations. This comes with draw backs in terms of increasing computing time. In Figure~\ref{fig:tt_cut}, the opening angle between an identified electron and its nearest track segment is correlated to the product of the momenta of these two tracks. A wedge cut can be applied to reduce the 
 background~\cite{galatyuk09}~\cite{lebedeva}. The additional number of reconstructed low-momentum electrons increases the number of background pairs, which is rejected by this cut. This suggests that the MVD might help to reduce the related background and that this capability is getting more pronounced with an increasing number of MVD-stations.
 \begin{figure}[tb]
 \vspace{-0.5cm}
 \centering
-\subfloat[$\rho^0$]{\includegraphics*[width=0.24\textwidth]{fh_tt_cut_signal.eps}\label{fig:tt_cut_signal}} \hfill
-\subfloat[$\pi^0$-Dalitz]{\includegraphics*[width=0.24\textwidth]{fh_tt_cut_pi0.eps}\label{fig:tt_cut_pi0}}
+\subfloat[$\rho^0$]{\includegraphics*[width=0.2\textwidth]{fh_tt_cut_signal.eps}\label{fig:tt_cut_signal}} \hfill
+\subfloat[$\pi^0$-Dalitz]{\includegraphics*[width=0.2\textwidth]{fh_tt_cut_pi0.eps}\label{fig:tt_cut_pi0}}
 \caption{Opening angle vs. momentum of an identified electron and its nearest reconstructed track for pairs from (a) $\rho^0$ decays and (b) $\pi^0$-Dalitz decays.}
 \label{fig:tt_cut}
 \end{figure}