JetCharge Studies$with$ATLAS$ - Cornell University · 1/3e p π+ p¯ π− π+ Jet Charge •...

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LEPP and CHESS resources have merged and a new lab, (CLASSE), has formed. LEPP's primary source of support is the National Science Foundation. Visit us at www.lepp.cornell.edu Of all the Standard Model par0cles, quarks carry the most (nontrivial) quantum numbers, yet none of these are directly observable. However, some of the informa0on from the quarks is passed on to the finalstate objects. Recently, the ATLAS collabora0on has performed a dedicated study on one such property, the jet charge, which is a proxy for quark charge. In this talk, I'll discuss both physics and performance aspects of the jet charge observable. Jet Charge Studies with ATLAS Friday, Nov. 1, 2013 4:00pm 401 Physical Sciences Building Refreshments, 3:45pm Ben Nachman SLAC CORNELL LABORATORY FOR ACCELERATORBASED SCIENCES AND EDUCATION (CLASSE) Journal Club

Transcript of JetCharge Studies$with$ATLAS$ - Cornell University · 1/3e p π+ p¯ π− π+ Jet Charge •...

Page 1: JetCharge Studies$with$ATLAS$ - Cornell University · 1/3e p π+ p¯ π− π+ Jet Charge • However, some info is passed to the final state. → Familiar example: jet p T. •

LEPP and CHESS resources have merged and a new lab, (CLASSE), has formed. LEPP's primary source of support is the National Science Foundation. Visit us at www.lepp.cornell.edu

Of   all   the   Standard  Model   par0cles,   quarks   carry   the  most   (non-­‐trivial)   quantum  numbers,   yet   none   of   these   are   directly   observable.   However,   some   of   the  informa0on   from  the  quarks   is    passed  on  to   the  final-­‐state  objects.  Recently,   the  ATLAS  collabora0on  has  performed  a  dedicated  study  on  one  such  property,  the  jet  charge,  which   is  a  proxy  for  quark  charge.   In  this   talk,   I'll  discuss  both  physics  and  performance  aspects  of  the  jet  charge  observable.  

Jet  Charge  Studies  with  ATLAS  

Friday,  Nov.  1,  2013  4:00pm  401  Physical  Sciences  Building  Refreshments,  3:45pm  

Ben  Nachman  SLAC  

CORNELL  LABORATORY  FOR  ACCELERATOR-­‐BASED  SCIENCES  AND  EDUCATION  (CLASSE)  

Journal  Club  

Introduction

Of the all the Standard Model particles, quarks carry the most (non-trivial)quantum numbers; none of these properties are directly observable.

!

u

d̄

2/3e

1/3e

p

π+

p̄

π−

π+

Jet Charge

• However, some info is passedto the final state.→ Familiar example: jet pT .

• The quark charge is anotherexample.

• We can only measure q ∈ Zso some information is lost.

→ Weighted sum overtrack/particle charges is aproxy to the quark chargeknown as

B. Nachman (SLAC) Jet Charge Studies with ATLAS September 9, 2013 3 / 30

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