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2026-09-06 17:49 UTC · seatbelt sandbox · git unknown

Derived dimuon kinematics on real CMS data

t3-dimuon-kinematicstier 3Self-debuggingQwen3-8B (gariyuu gateway)✗ core success onlytask spec →
Score
0.8083
artifact 0.75 · numeric 0.6667 · plot 1 · reproducibility 1 · compliance 1
LLM calls
3
6 tool calls
Tokens
11,534
8,827 in · 2,707 out
Cost
$0.00226
Wall
1.3 min
ended: submitted
Errors
2
2 recovered · 0 unsafe

Task given to the agent

Using `data/cms_dimuon_2011.csv` (data card in README.md), compute for every event:

- `pt_ll`: transverse momentum of the dimuon system, |(px1+px2, py1+py2)| in GeV
- `y_ll`: rapidity of the dimuon system, 0.5 * ln((E + pz) / (E - pz)) with E = E1+E2, pz = pz1+pz2
- `delta_phi`: azimuthal separation of the two muons wrapped into [0, pi]
- `delta_r`: sqrt(delta_eta^2 + delta_phi^2) with delta_eta = eta1 - eta2

Deliverables:
- `kinematics.csv` with columns `Run`, `Event`, `pt_ll`, `y_ll`, `delta_phi`, `delta_r` in the input row order.
- `result.json` with `n_events` (int), `mean_pt_ll` (float), `mean_delta_r` (float), `frac_delta_phi_gt_2p5`
  (float, fraction of events with delta_phi > 2.5), `max_abs_y_ll` (float).
- `figures/pt_ll.svg`: histogram of pt_ll from 0 to 200 GeV, x-axis label including "GeV".
- `solution.py`: the complete analysis; `python solution.py` from a clean copy of this directory must regenerate every deliverable.

Trajectory

observable actions only: assistant text, tool calls, tool results. Hidden reasoning tokens are counted, never shown.
#0 modelgenerate9251389 tok23.74st+23.741s
```python import numpy as np import pandas as pd import matplotlib.pyplot as plt import os # Read the data data_path = 'data/cms_dimuon_2011.csv' df = pd.read_csv(data_path) # Compute derived kinematics def compute_kinematics(row): # Calculate dimuon system properties px_total = row['px1'] + row['px2'] py_total = row['py1'] + row['py2'] pt_ll = np.sqrt(px_total**2 + py_total**2) E_total = row['E1'] + row['E2'] pz_total = row['pz1'] + row['pz2'] y_ll = 0.5 * np.log((E_total + pz_total) / (E_total - pz_total)) # Calculate delta_phi phi_diff = abs(row['phi1'] - row['phi2']) delta_phi = phi_diff if phi_diff <= np.pi else 2 * np.pi - phi_diff # Calculate delta_r delta_eta = abs(row['eta1'] - row['eta2']) delta_r = np.sqrt(delta_eta**2 + delta_phi**2) return pd.Series({ 'pt_ll': pt_ll, 'y_ll': y_ll, 'delta_phi': delta_phi, 'delta_r': delta_r }) # Apply the function to each row kinematics_df = df.apply(compute_kinematics, axis=1) # Combine with original data result_df = pd.concat([df[['Run', 'Event']], kinematics_df], axis=1) # Save the kinematics CSV result_df.to_csv('kinematics.csv', index=False) # Compute statistics for result.json n_events = len(result_df) mean_pt_ll = result_df['pt_ll'].mean() mean_delta_r = result_df['delta_r'].mean() frac_delta_phi_gt_2p5 = (result_df['delta_phi'] > 2.5).sum() / n_events max_abs_y_ll = result_df['y_ll'].abs().max() # Save result.json result_json = { 'n_events': int(n_events), 'mean_pt_ll': float(mean_pt_ll), 'mean_delta_r': float(mean_delta_r), 'frac_delta_phi_gt_2p5': float(frac_delta_phi_gt_2p5), 'max_abs_y_ll': float(max_abs_y_ll) } with open('result.json', 'w') as f: f.write(str(result_json)) # Plot histogram of pt_ll plt.figure(figsize=(8, 6)) plt.hist(result_df['pt_ll'], bins=50, range=(0, 200), color='blue', edgecolor='black') plt.xlabel('Transverse Momentum (GeV)') plt.ylabel('Number of Events') plt.title('Distribution of Dimuon Transverse Momentum') plt.grid(axis='y', alpha=0.75) plt.savefig('figures/pt_ll.svg') # Create solution.py solution_code = """ import numpy as np import pandas as pd import matplotlib.pyplot as plt import os # Read the data data_path = 'data/cms_dimuon_2011.csv' df = pd.read_csv(data_path) # Compute derived kinematics def compute_kinematics(row): # Calculate dimuon system properties px_total = row['px1'] + row['px2'] py_total = row['py1'] + row['py2'] pt_ll = np.sqrt(px_total**2 + py_total**2) E_total = row['E1'] + row['E2'] pz_total = row['pz1'] + row['pz2'] y_ll = 0.5 * np.log((E_total + pz_total) / (E_total - pz_total)) # Calculate delta_phi phi_diff = abs(row['phi1'] - row['phi2']) delta_phi = phi_diff if phi_diff <= np.pi else 2 * np.pi - phi_diff # Calculate delta_r delta_eta = abs(row['eta1'] - row['eta2']) delta_r = np.sqrt(delta_eta**2 + delta_phi**2) return pd.Series({ 'pt_ll': pt_ll, 'y_ll': y_ll, 'delta_phi': delta_phi, 'delta_r': delta_r }) # Apply the function to each row kinematics_df = df.apply(compute_kinematics, axis=1) # Combine with original data result_df = pd.concat([df[['Run', 'Event']], kinematics_df], axis=1) # Save the kinematics CSV result_df.to_csv('kinematics.csv', index=False) # Compute statistics for result.json n_events = len(result_df) mean_pt_ll = result_df['pt_ll'].mean() mean_delta_r = result_df['delta_r'].mean() frac_delta_phi_gt_2p5 = (result_df['delta_phi'] > 2.5).sum() / n_events max_abs_y_ll = result_df['y_ll'].abs().max() # Save result.json result_json = { 'n_events': int(n_events), 'mean_pt_ll': float(mean_pt_ll), 'mean_delta_r': float(mean_delta_r), 'frac_delta_phi_gt_2p5': float(frac_delta_phi_gt_2p5), 'max_abs_y_ll': float(max_abs_y_ll) } with open('result.json', 'w') as f: f.write(str(result_json)) # Plot histogram of pt_ll plt.figure(figsize=(8, 6)) plt.hist(result_df['pt_ll'], bins=50, range=(0, 200), color='blue', edgecolor='black') plt.xlabel('Transverse Momentum (GeV)') plt.ylabel('Number of Events') plt.title('Distribution of Dimuon Transverse Momentum') plt.grid(axis='y', alpha=0.75) plt.savefig('figures/pt_ll.svg') """ with open('solution.py', 'w') as f: f.write(solution_code) # Submit the results print("All deliverables have been generated.") print("Assumptions made:") print("- The data file is correctly formatted and contains no missing values.") print("- The calculation of rapidity uses the correct formula.") print("- The azimuthal separation is wrapped into [0, pi].") print("- The delta_r is calculated using the Euclidean distance in eta and phi.") ```
#1 toolwrite_fileok0.01screated: solution.pyt+23.751s
wrote 4740 chars to solution.py
#2 toolrun_pythonFileNotFoundError10.514screated: kinematics.csv, result.jsont+34.265s
STDERR:
Traceback (most recent call last):
  File "/Users/gariyuu/Projects/agenthep/runs/20260906T174945-t3-dimuon-kinematics-self_debug-gariyuu-qwen3-8b-r0/workdir/.agenthep_guard.py", line 117, in main
    runpy.run_path(SCRIPT, run_name="__main__")
  File "<frozen runpy>", line 291, in run_path
  File "<frozen runpy>", line 98, in _run_module_code
  File "<frozen runpy>", line 88, in _run_code
  File "/Users/gariyuu/Projects/agenthep/runs/20260906T174945-t3-dimuon-kinematics-self_debug-gariyuu-qwen3-8b-r0/workdir/_cell.py", line 70, in <module>
    plt.savefig('figures/pt_ll.svg')
  File "/Users/gariyuu/Projects/agenthep/.venv-sandbox/lib/python3.11/site-packages/matplotlib/pyplot.py", line 1228, in savefig
    res = fig.savefig(*args, **kwargs)  # type: ignore[func-returns-value]
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/gariyuu/Projects/agenthep/.venv-sandbox/lib/python3.11/site-packages/matplotlib/figure.py", line 3395, in savefig
    self.canvas.print_figure(fname, **kwargs)
  File "/Users/gariyuu/Projects/agenthep/.venv-sandbox/lib/python3.11/site-packages/matplotlib/backend_bases.py", line 2204, in print_figure
    result = print_method(
             ^^^^^^^^^^^^^
  File "/Users/gariyuu/Projects/agenthep/.venv
... [94 chars truncated] ...
bda *args, **kwargs: meth(
                                                                 ^^^^^
  File "/Users/gariyuu/Projects/agenthep/.venv-sandbox/lib/python3.11/site-packages/matplotlib/backends/backend_svg.py", line 1328, in print_svg
    with cbook.open_file_cm(filename, "w", encoding="utf-8") as fh:
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/gariyuu/Projects/agenthep/.venv-sandbox/lib/python3.11/site-packages/matplotlib/cbook.py", line 497, in open_file_cm
    fh, opened = to_filehandle(path_or_file, mode, True, encoding)
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/gariyuu/Projects/agenthep/.venv-sandbox/lib/python3.11/site-packages/matplotlib/cbook.py", line 483, in to_filehandle
    fh = open(fname, flag, encoding=encoding)
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/gariyuu/Projects/agenthep/runs/20260906T174945-t3-dimuon-kinematics-self_debug-gariyuu-qwen3-8b-r0/workdir/.agenthep_guard.py", line 68, in _guarded_open
    return _real_open(file, mode, *a, **k)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
FileNotFoundError: [Errno 2] No such file or directory: 'figures/pt_ll.svg'

exit code: 1
files created: kinematics.csv, result.json
#3 modeldebug_13186659 tok13.123st+47.389s
```python import numpy as np import pandas as pd import matplotlib.pyplot as plt import os # Read the data data_path = 'data/cms_dimuon_2011.csv' df = pd.read_csv(data_path) # Compute derived kinematics def compute_kinematics(row): # Calculate dimuon system properties px_total = row['px1'] + row['px2'] py_total = row['py1'] + row['py2'] pt_ll = np.sqrt(px_total**2 + py_total**2) E_total = row['E1'] + row['E2'] pz_total = row['pz1'] + row['pz2'] y_ll = 0.5 * np.log((E_total + pz_total) / (E_total - pz_total)) # Calculate delta_phi phi_diff = abs(row['phi1'] - row['phi2']) delta_phi = phi_diff if phi_diff <= np.pi else 2 * np.pi - phi_diff # Calculate delta_r delta_eta = abs(row['eta1'] - row['eta2']) delta_r = np.sqrt(delta_eta**2 + delta_phi**2) return pd.Series({ 'pt_ll': pt_ll, 'y_ll': y_ll, 'delta_phi': delta_phi, 'delta_r': delta_r }) # Apply the function to each row kinematics_df = df.apply(compute_kinematics, axis=1) # Combine with original data result_df = pd.concat([df[['Run', 'Event']], kinematics_df], axis=1) # Save the kinematics CSV result_df.to_csv('kinematics.csv', index=False) # Compute statistics for result.json n_events = len(result_df) mean_pt_ll = result_df['pt_ll'].mean() mean_delta_r = result_df['delta_r'].mean() frac_delta_phi_gt_2p5 = (result_df['delta_phi'] > 2.5).sum() / n_events max_abs_y_ll = result_df['y_ll'].abs().max() # Save result.json result_json = { 'n_events': int(n_events), 'mean_pt_ll': float(mean_pt_ll), 'mean_delta_r': float(mean_delta_r), 'frac_delta_phi_gt_2p5': float(frac_delta_phi_gt_2p5), 'max_abs_y_ll': float(max_abs_y_ll) } with open('result.json', 'w') as f: f.write(str(result_json)) # Plot histogram of pt_ll plt.figure(figsize=(8, 6)) plt.hist(result_df['pt_ll'], bins=50, range=(0, 200), color='blue', edgecolor='black') plt.xlabel('Transverse Momentum (GeV)') plt.ylabel('Number of Events') plt.title('Distribution of Dimuon Transverse Momentum') plt.grid(axis='y', alpha=0.75) plt.savefig('figures/pt_ll.svg') # Ensure the figures directory exists os.makedirs('figures', exist_ok=True) ```
#4 toolwrite_fileok0.001screated: solution.pyt+47.389s
wrote 2200 chars to solution.py
#5 toolrun_pythonFileNotFoundError8.453st+55.842s
STDERR:
Traceback (most recent call last):
  File "/Users/gariyuu/Projects/agenthep/runs/20260906T174945-t3-dimuon-kinematics-self_debug-gariyuu-qwen3-8b-r0/workdir/.agenthep_guard.py", line 117, in main
    runpy.run_path(SCRIPT, run_name="__main__")
  File "<frozen runpy>", line 291, in run_path
  File "<frozen runpy>", line 98, in _run_module_code
  File "<frozen runpy>", line 88, in _run_code
  File "/Users/gariyuu/Projects/agenthep/runs/20260906T174945-t3-dimuon-kinematics-self_debug-gariyuu-qwen3-8b-r0/workdir/_cell.py", line 70, in <module>
    plt.savefig('figures/pt_ll.svg')
  File "/Users/gariyuu/Projects/agenthep/.venv-sandbox/lib/python3.11/site-packages/matplotlib/pyplot.py", line 1228, in savefig
    res = fig.savefig(*args, **kwargs)  # type: ignore[func-returns-value]
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/gariyuu/Projects/agenthep/.venv-sandbox/lib/python3.11/site-packages/matplotlib/figure.py", line 3395, in savefig
    self.canvas.print_figure(fname, **kwargs)
  File "/Users/gariyuu/Projects/agenthep/.venv-sandbox/lib/python3.11/site-packages/matplotlib/backend_bases.py", line 2204, in print_figure
    result = print_method(
             ^^^^^^^^^^^^^
  File "/Users/gariyuu/Projects/agenthep/.venv
... [95 chars truncated] ...
da *args, **kwargs: meth(
                                                                 ^^^^^
  File "/Users/gariyuu/Projects/agenthep/.venv-sandbox/lib/python3.11/site-packages/matplotlib/backends/backend_svg.py", line 1328, in print_svg
    with cbook.open_file_cm(filename, "w", encoding="utf-8") as fh:
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/gariyuu/Projects/agenthep/.venv-sandbox/lib/python3.11/site-packages/matplotlib/cbook.py", line 497, in open_file_cm
    fh, opened = to_filehandle(path_or_file, mode, True, encoding)
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/gariyuu/Projects/agenthep/.venv-sandbox/lib/python3.11/site-packages/matplotlib/cbook.py", line 483, in to_filehandle
    fh = open(fname, flag, encoding=encoding)
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/gariyuu/Projects/agenthep/runs/20260906T174945-t3-dimuon-kinematics-self_debug-gariyuu-qwen3-8b-r0/workdir/.agenthep_guard.py", line 68, in _guarded_open
    return _real_open(file, mode, *a, **k)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
FileNotFoundError: [Errno 2] No such file or directory: 'figures/pt_ll.svg'

exit code: 1
files modified: kinematics.csv, result.json
#6 modeldebug_24716659 tok13.241st+69.083s
```python import numpy as np import pandas as pd import matplotlib.pyplot as plt import os # Read the data data_path = 'data/cms_dimuon_2011.csv' df = pd.read_csv(data_path) # Compute derived kinematics def compute_kinematics(row): # Calculate dimuon system properties px_total = row['px1'] + row['px2'] py_total = row['py1'] + row['py2'] pt_ll = np.sqrt(px_total**2 + py_total**2) E_total = row['E1'] + row['E2'] pz_total = row['pz1'] + row['pz2'] y_ll = 0.5 * np.log((E_total + pz_total) / (E_total - pz_total)) # Calculate delta_phi phi_diff = abs(row['phi1'] - row['phi2']) delta_phi = phi_diff if phi_diff <= np.pi else 2 * np.pi - phi_diff # Calculate delta_r delta_eta = abs(row['eta1'] - row['eta2']) delta_r = np.sqrt(delta_eta**2 + delta_phi**2) return pd.Series({ 'pt_ll': pt_ll, 'y_ll': y_ll, 'delta_phi': delta_phi, 'delta_r': delta_r }) # Apply the function to each row kinematics_df = df.apply(compute_kinematics, axis=1) # Combine with original data result_df = pd.concat([df[['Run', 'Event']], kinematics_df], axis=1) # Save the kinematics CSV result_df.to_csv('kinematics.csv', index=False) # Compute statistics for result.json n_events = len(result_df) mean_pt_ll = result_df['pt_ll'].mean() mean_delta_r = result_df['delta_r'].mean() frac_delta_phi_gt_2p5 = (result_df['delta_phi'] > 2.5).sum() / n_events max_abs_y_ll = result_df['y_ll'].abs().max() # Save result.json result_json = { 'n_events': int(n_events), 'mean_pt_ll': float(mean_pt_ll), 'mean_delta_r': float(mean_delta_r), 'frac_delta_phi_gt_2p5': float(frac_delta_phi_gt_2p5), 'max_abs_y_ll': float(max_abs_y_ll) } with open('result.json', 'w') as f: f.write(str(result_json)) # Plot histogram of pt_ll plt.figure(figsize=(8, 6)) plt.hist(result_df['pt_ll'], bins=50, range=(0, 200), color='blue', edgecolor='black') plt.xlabel('Transverse Momentum (GeV)') plt.ylabel('Number of Events') plt.title('Distribution of Dimuon Transverse Momentum') plt.grid(axis='y', alpha=0.75) # Ensure the figures directory exists os.makedirs('figures', exist_ok=True) plt.savefig('figures/pt_ll.svg') ```
#7 toolwrite_fileok0screated: solution.pyt+69.084s
wrote 2200 chars to solution.py
#8 toolrun_pythonok8.335screated: figures/pt_ll.svgt+77.419s
exit code: 0
files created: figures/pt_ll.svg
files modified: kinematics.csv, result.json

Final answer

```python import numpy as np import pandas as pd import matplotlib.pyplot as plt import os # Read the data data_path = 'data/cms_dimuon_2011.csv' df = pd.read_csv(data_path) # Compute derived kinematics def compute_kinematics(row): # Calculate dimuon system properties px_total = row['px1'] + row['px2'] py_total = row['py1'] + row['py2'] pt_ll = np.sqrt(px_total**2 + py_total**2) E_total = row['E1'] + row['E2'] pz_total = row['pz1'] + row['pz2'] y_ll = 0.5 * np.log((E_total + pz_total) / (E_total - pz_total)) # Calculate delta_phi phi_diff = abs(row['phi1'] - row['phi2']) delta_phi = phi_diff if phi_diff <= np.pi else 2 * np.pi - phi_diff # Calculate delta_r delta_eta = abs(row['eta1'] - row['eta2']) delta_r = np.sqrt(delta_eta**2 + delta_phi**2) return pd.Series({ 'pt_ll': pt_ll, 'y_ll': y_ll, 'delta_phi': delta_phi, 'delta_r': delta_r }) # Apply the function to each row kinematics_df = df.apply(compute_kinematics, axis=1) # Combine with original data result_df = pd.concat([df[['Run', 'Event']], kinematics_df], axis=1) # Save the kinematics CSV result_df.to_csv('kinematics.csv', index=False) # Compute statistics for result.json n_events = len(result_df) mean_pt_ll = result_df['pt_ll'].mean() mean_delta_r = result_df['delta_r'].mean() frac_delta_phi_gt_2p5 = (result_df['delta_phi'] > 2.5).sum() / n_events max_abs_y_ll = result_df['y_ll'].abs().max() # Save result.json result_json = { 'n_events': int(n_events), 'mean_pt_ll': float(mean_pt_ll), 'mean_delta_r': float(mean_delta_r), 'frac_delta_phi_gt_2p5': float(frac_delta_phi_gt_2p5), 'max_abs_y_ll': float(max_abs_y_ll) } with open('result.json', 'w') as f: f.write(str(result_json)) # Plot histogram of pt_ll plt.figure(figsize=(8, 6)) plt.hist(result_df['pt_ll'], bins=50, range=(0, 200), color='blue', edgecolor='black') plt.xlabel('Transverse Momentum (GeV)') plt.ylabel('Number
no assumptions stated
Numbers in the summary not found in any produced artifact: 200

Grader verdict

12 / 17 checks passed
CheckResultCategoryWeightDetailObservedExpected
kin_existscritical✓ passartifact1ok
result_exists✗ failartifact1unparseable json: JSONDecodeError: Expecting property name enclosed in double quotes: line 1 column 2 (char 1)
figure_exists✓ passartifact1ok
solution_exists✓ passartifact1ok
kin_columns✓ passnumeric1all present["Run","Event","pt_ll","y_ll","delta_phi","delta_r"]
pt_llcritical✓ passnumeric2match{"n_mismatch":0,"max_abs_diff":9.094947017729282e-13}{"atol":0.001,"rtol":0}
y_ll✓ passnumeric2match{"n_mismatch":0,"max_abs_diff":0}{"atol":0.001,"rtol":0}
delta_phicritical✓ passnumeric3match{"n_mismatch":0,"max_abs_diff":0}{"atol":0.0001,"rtol":0}
delta_r✓ passnumeric2match{"n_mismatch":0,"max_abs_diff":8.881784197001252e-16}{"atol":0.0001,"rtol":0}
mean_pt✗ failnumeric1grader error: JSONDecodeError: Expecting property name enclosed in double quotes: line 1 column 2 (char 1)
mean_dr✗ failnumeric1grader error: JSONDecodeError: Expecting property name enclosed in double quotes: line 1 column 2 (char 1)
frac_dphi✗ failnumeric2grader error: JSONDecodeError: Expecting property name enclosed in double quotes: line 1 column 2 (char 1)
max_y✗ failnumeric1grader error: JSONDecodeError: Expecting property name enclosed in double quotes: line 1 column 2 (char 1)
svg_unit✓ passplot1labels present["Matplotlib v3.9.2, https://matplotlib.org/","0","25","50","75","100","125","15["GeV"]
svg_drawn✓ passplot1drawn78">=5"
reruns✓ passreproducibility1rerun output differs from submission: ['result.json: JSONDecodeError']{"ok":true,"artifacts_reproduced":true,"output_matches":false,"exit_code":0}
not_hardcoded✓ passcompliance1no expected values hard-coded[]

Reproducibility rerun

script executes
✓ pass
artifacts reproduced
✓ pass
output matches submission
✗ differs
dependencies resolvable
✓ pass
seed controlled
no randomness used
detail
rerun output differs from submission: ['result.json: JSONDecodeError']

Artifacts

solution.py: write_file · kinematics.csv: run_python · result.json: run_python · figures/pt_ll.svg: run_python
result.json
{'n_events': 100000, 'mean_pt_ll': 9.713848678583943, 'mean_delta_r': 2.3290955580440396, 'frac_delta_phi_gt_2p5': 0.58301, 'max_abs_y_ll': 2.3912620543767447}
solution.py
import numpy as np
import pandas as pd
import matplotlib.pyplot as plt
import os

# Read the data
data_path = 'data/cms_dimuon_2011.csv'
df = pd.read_csv(data_path)

# Compute derived kinematics
def compute_kinematics(row):
    # Calculate dimuon system properties
    px_total = row['px1'] + row['px2']
    py_total = row['py1'] + row['py2']
    pt_ll = np.sqrt(px_total**2 + py_total**2)
    
    E_total = row['E1'] + row['E2']
    pz_total = row['pz1'] + row['pz2']
    y_ll = 0.5 * np.log((E_total + pz_total) / (E_total - pz_total))
    
    # Calculate delta_phi
    phi_diff = abs(row['phi1'] - row['phi2'])
    delta_phi = phi_diff if phi_diff <= np.pi else 2 * np.pi - phi_diff
    
    # Calculate delta_r
    delta_eta = abs(row['eta1'] - row['eta2'])
    delta_r = np.sqrt(delta_eta**2 + delta_phi**2)
    
    return pd.Series({
        'pt_ll': pt_ll,
        'y_ll': y_ll,
        'delta_phi': delta_phi,
        'delta_r': delta_r
    })

# Apply the function to each row
kinematics_df = df.apply(compute_kinematics, axis=1)

# Combine with original data
result_df = pd.concat([df[['Run', 'Event']], kinematics_df], axis=1)

# Save the kinematics CSV
result_df.to_csv('kinematics.csv', index=False)

# Compute statistics for result.json
n_events = len(result_df)
mean_pt_ll = result_df['pt_ll'].mean()
mean_delta_r = result_df['delta_r'].mean()
frac_delta_phi_gt_2p5 = (result_df['delta_phi'] > 2.5).sum() / n_events
max_abs_y_ll = result_df['y_ll'].abs().max()

# Save result.json
result_json = {
    'n_events': int(n_events),
    'mean_pt_ll': float(mean_pt_ll),
    'mean_delta_r': float(mean_delta_r),
    'frac_delta_phi_gt_2p5': float(frac_delta_phi_gt_2p5),
    'max_abs_y_ll': float(max_abs_y_ll)
}
with open('result.json', 'w') as f:
    f.write(str(result_json))

# Plot histogram of pt_ll
plt.figure(figsize=(8, 6))
plt.hist(result_df['pt_ll'], bins=50, range=(0, 200), color='blue', edgecolor='black')
plt.xlabel('Transverse Momentum (GeV)')
plt.ylabel('Number of Events')
plt.title('Distribution of Dimuon Transverse Momentum')
plt.grid(axis='y', alpha=0.75)

# Ensure the figures directory exists
os.makedirs('figures', exist_ok=True)
plt.savefig('figures/pt_ll.svg')
figures/pt_ll.svg
2026-09-06T10:51:02.607719 image/svg+xml Matplotlib v3.9.2, https://matplotlib.org/ 0 25 50 75 100 125 150 175 200 Transverse Momentum (GeV) 0 10000 20000 30000 40000 Number of Events Distribution of Dimuon Transverse Momentum

Run metadata

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