You are an expert at summarizing long articles. Proceed to summarize the following text: 
miniboone  @xcite is a neutrino oscillation experiment at fermilab , designed to confirm or rule out the hypothesis that the lsnd @xmath0 excess  @xcite is due to @xmath1 oscillations . a general description of the experiment can be found elsewhere  @xcite . heretofore , miniboone has been taking data in neutrino mode , searching for @xmath2 oscillations . however , in some scenarios involving cp and cpt violation , oscillations may occur only in antineutrinos . thus , searching for oscillations in antineutrinos is a crucial test  @xcite . furthermore , the search for cp violation in the neutrino sector by future off - axis experiments  @xcite requires @xmath1 oscillation measurements , as well as @xmath2 . the signature for cp violation is an asymmetry in these oscillation probabilities , but this can only be confirmed if the precision of the @xmath3 and @xmath4 cross sections are smaller than the observed asymmetry . there are few @xmath3 cross section data published  @xcite to date , but even fewer measurements of low energy @xmath4 cross sections . we will need more and better data if we hope to find cp violation in the neutrino sector . .__event rates expected in miniboone @xmath4 running with @xmath5 pot assuming a 550 cm fiducial volume , before cuts . listed are the expected right - sign ( rs ) and wrong - sign ( ws ) events for each reaction channel . _ _ [ cols="^,^,^",options="header " , ]     in order to use this technique to constrain the ws background , the angular resolution for muons must be sufficiently good to separate the two populations . miniboone s angular resolution is measured using the cosmic muon calibration system , which consists of a muon tracker hodoscope placed above the detector . figure  [ fig : mutr_delmt ] shows the 4@xmath6 angular resolution of muons between 400 and 500 mev . this resolution is sufficient to allow exploitation of the angular differences in the ccqe outgoing muons distributions . the angular distributions can be fitted to extract the wrong - sign contribution . analysis of our monte carlo data sets indicates that the wrong - sign content can be measured using this technique , with a statistical uncertainty of 5% of itself  @xcite . this is illustrated in figure  [ fig : muang_recon ] , which shows the reconstructed angle of the out - going lepton with respect to the neutrino beam axis for both @xmath7 and @xmath8 cc qe events generated with the miniboone monte carlo , after all selection cuts have been applied . including systematic uncertainties and ( non - qe ) backgrounds increases the uncertainty on the ws extraction only to @xmath9 .      a second constraint results from measuring the rate at which muons decay in the miniboone detector . due to an @xmath10 @xmath11 capture probability in mineral oil , negatively and positively charged muons exhibit different effective lifetimes ( @xmath12 for @xmath11  @xcite and @xmath13 for @xmath14  @xcite ) . to extract the ws fraction , one simply fits the muon lifetime with a sum of two exponentials , with the extracted fraction of each exponential term giving the fraction of rs or ws events . for ccqe events , we find that the wrong - sign contribution can be extracted with a @xmath15 statistical uncertainty based solely on this lifetime difference and negligible systematic uncertainties . while not as precise as fits to the muon angular distributions , this particular constraint is unique , as it is independent of kinematics . our third wrong - sign constraint employs the the fact that antineutrinos do not create cc@xmath16 events in the detector these all stem from neutrinos ( table  [ table : nubar - event - stats ] ) . miniboone identifies cc@xmath16 events by tagging the two decay electrons that follow the primary neutrino interaction , one from the @xmath11 and one from the @xmath17 decay  @xcite . however , cc@xmath18 events do not pass this requirement because all the emitted @xmath19 s which stop in the detector descend into atomic orbits around carbon nuclei and are instantly captured , leaving no decay electrons  @xcite . the @xmath19 decay in flight rate is much smaller than the rate of @xmath17 decays at rest  @xcite . thus , applying the two michel cut to the full sample , which is @xmath20 antineutrino ( rs ) interactions , yields an @xmath21 pure sample of ws neutrino events . assuming conservative uncertainties for the antineutrino background events and the cc@xmath16 cross section , which is currently being measured by miniboone , we expect a @xmath22 uncertainty on the wrong - sign content in the beam given @xmath5 pot . this constraint is complementary to the muon angular distributions , because cc@xmath16 events stem mainly from resonance decays , thus constraining the wrong - sign content at larger neutrino energies . miniboone expects more than 40,000 qe interactions in antineutrino mode with @xmath5 pot before cuts . using the same qe event selection criteria as the previously reported miniboone neutrino analysis  @xcite yields a sample of @xmath23 events , with @xmath24 qe purity with both ws and rs events .    assuming the above wrong - sign constraints and conservative errors on the @xmath3 flux , backgrounds , and event detection , we expect a miniboone measurement of the @xmath8 qe cross section to better than @xmath25 with @xmath5 pot . @xmath8 neutral current ( nc ) @xmath26 production is one of the largest backgrounds to future @xmath1 oscillation searches . there has been only one published measurement of the absolute rate of this channel , with @xmath27 uncertainty at 2 gev  @xcite . applying miniboone s @xmath7 nc @xmath26 cuts  @xcite with no modifications leaves a sample of antineutrino nc @xmath26 events with a similar event purity and efficiency . after this selection , we expect 1,650 @xmath8 resonant nc @xmath26 events and 1,640 @xmath8 coherent nc @xmath26 events assuming @xmath5 pot and the rein and sehgal model of coherent pion production  @xcite . coherent pion production has a characteristic pion angular distribution that allows it to be distinguished from resonant production , as illustrated in figures  [ fig : ncpi0-nu ] and [ fig : ncpi0-nubar ] . moreover , the previously mentioned figures illustrate that the distinctiveness of the angular distributions should be even more marked in antineutrino running , which increases the value of antineutrino data for understanding coherent production . the background of @xmath28  1000 ws events will be determined by the constraints on the wrong - sign content in the beam as described in section  [ sec : ws - constraints ] and the measurement of the @xmath7 nc @xmath26 cross section from miniboone neutrino data . miniboone expects roughly 7,000 resonant cc @xmath18 with @xmath5 pot before cuts . as discussed above , almost all of the emitted @xmath19 s will be absorbed by carbon nuclei , and will therefore not be selected by the cc1@xmath17 cuts . nevertheless , these events still have a signature : two cherenkov rings ( one each from the @xmath14 and @xmath19 ) and one michel electron in the vicinity of the @xmath11 . the selection efficiency and purity of such events is unknown at this time . further investigation is currently underway . although miniboone has been searching for oscillations in neutrino mode , the lsnd oscillation signal was actually an excess of antineutrino events . because of the potential for finding cp violation in the neutrino sector , it is imperative that miniboone test the lsnd oscillation hypothesis with antineutrino data  @xcite .    figure  [ fig : nuebar - app ] shows an estimate of the miniboone sensitivity to @xmath1 oscillations under the assumption that @xmath2 oscillations do not occur , i.e. assuming miniboone sees no @xmath29 appearance signal . here , we compare the sensitivity to the joint karmen - lsnd region ( @xmath4 only )  @xcite , not the full lsnd allowed region ( @xmath30 ) . this is a statistics - limited search ; further running is needed beyond the @xmath5 pot assumed in the preceding sections in order to test the lsnd hypothesis . this sensitivity shown assumes @xmath31 pot . we have developed three techniques for determining the wrong - sign background in antineutrino mode . the resulting systematic error on any given @xmath4 cross section measurement due to the wrong sign contamination should be less than 2% averaged over the entire flux , which is remarkable for a detector which does not possess event - by - event sign selection . given this redundant approach , the wrong - sign contamination should not be considered prohibitive to producing meaningful antineutrino cross section  @xcite and oscillation measurements  @xcite at miniboone . these techniques may also be useful for other experiments without magnetized detectors which have plans to study antineutrino interactions ( _ e.g. _ t2k , no@xmath3a , super - k ) . miniboone began running in antineutrino mode on 19 january , 2006 , and is currently approved to run for one more year . in order to truly confirm or rule out the lsnd oscillation hypothesis , miniboone needs 6@xmath32 pot , which will require additional years of running . the author is pleased to acknowledge the collaborative efforts of j.m . link , h.a . tanaka , and g.p . zeller in developing the ideas in this work . the author would also like to express gratitude to the organizers of nuint05 for their generous travel support . the miniboone collaboration gratefully acknowledges support from various grants and contracts from the department of energy and the national science foundation . the author was supported by grant number de - fg02 - 91er0617 from the department of energy . tanaka , `` estimating ws content in negative polarity horn data '' , boone memo ( 2004 ) . for more information on the boone memos and technical notes , contact the miniboone spokespeople , j.  m.  conrad or w.  c.  louis .
miniboone began running in antineutrino mode on 19 january , 2006 . 
 we describe the sensitivity of miniboone to lsnd - like @xmath0 oscillations and outline a program of antineutrino cross - section measurements necessary for the next generation of neutrino oscillation experiments . 
 we describe three independent methods of constraining wrong - sign ( neutrino ) backgrounds in an antineutrino beam , and their application to the miniboone antineutrino analyses .